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1

Recycling of water in bleached kraft pulp mills by using electrodialysis.  

SciTech Connect (OSTI)

Conservation of water in bleached kraft pulp mills by recycling the bleach plant effluent directly without treatment will cause accumulation of inorganic ''non-process elements'' (NPEs) and serious operational problems. In this work, an electrodialysis process is being developed for recycling the acidic bleach plant effluent of bleached kraft pulp mills. In this process, electrodialysis functions as a selective kidney to remove inorganic NPEs from bleach plant effluents, before they reach the recovery cycle. Acidic bleach plant effluents from several mills using bleaching sequences based on chlorine dioxide were characterized. The total dissolved solids were mostly inorganic NPEs. Sodium was the predominant cation and chloride was present at significant levels in all these effluents. In laboratory electrodialysis experiments, selective removal of chloride and potentially harmful cations, such as potassium, calcium, and magnesium, were removed efficiently. Rejection of organic compounds was up to 98%. Electrodialysis was shown to be resistant to membrane fouling and scaling, in a 100-hour laboratory experiment. Based on a model mill with 1,000 ton/day pulp production, the economic analysis suggests that the energy cost of electrodialysis is less than $200/day, and the capital cost of the stack is about $500,000.

Fracaro, A. T.; Henry, M. P.; Pfromm, P.; Tsai, S.-P.

1999-01-15T23:59:59.000Z

2

Methanol-reinforced kraft pulping  

SciTech Connect (OSTI)

The addition of methanol to a high-sulfidity kraft cook on Scandinavian softwood chips was studied under different process conditions. Delignification and the degradation of carbohydrates were accelerated, but the effect on delignification was greater. Thus, methanol addition improved selectivity. The positive effect of methanol could also be observed for modified kraft cooks having a leveled out alkali concentration and lower concentration of sodium ions and dissolved lignin at the end of the cook. Methanol addition had no discernible effect on pulp strength or on pulp bleachability.

Norman, E.; Olm, L.; Teder, A. (STFI, Stockholm (Sweden))

1993-03-01T23:59:59.000Z

3

Understanding the Nature and Reactivity of Residual Lignin for Improved Pulping and Bleaching Efficiency  

SciTech Connect (OSTI)

One of the most formidable challenges in kraft pulping to produce bleached chemical pulps is how to effectively remove the last 5-10% of lignin while maintaining the fiber quality. To avoid a severe fiber degradation, kraft pulping is usually terminated in the 25-30 kappa number range and then followed by an elementally chlorine free (ECF) or a totally chlorine free (TCF) bleaching sequence to reduce the environmental impacts.

Yuan-Zong Lai

2001-11-30T23:59:59.000Z

4

Control of the Accumulation of Non-Process Elements in Pulp Mills with Bleach Filtrate Reuse: A Chemical Equilibrium Approach to Predicting the Partitioning of Metals in Pulp Mill and Bleach Plant Streams  

SciTech Connect (OSTI)

The overall goal of this project was to develop fundamental, experimentally based methods for predicting the solubility or organic and inorganic matter and their interactions in recycled effluent from kraft pulp mills and bleach plants. This included: characterizing the capacity of wood pulp and dissolved organic matter to bind metal ions, developing a thermodynamic database of properties needed to describe the solubility of inorganic matter in pulp mill streams, incorporation of the database into equilibrium calculation software for predicting the solubility of the metals of interest, and evaluating its capability to predict the distribution of the metals between pulp fibers, inorganic precipitates, and solution.

Frederick, W.J. Jr.; Rudie, A.W.; Schmidl, G.W.; Sinquefield, S.A.; Rorrer, G.L.; Laver, M.L.; Yantasee, W.; Ming, D.

2000-08-01T23:59:59.000Z

5

Low Odor, High Yield Kraft Pulping  

SciTech Connect (OSTI)

In laboratory cooks pure oxygen was profiled into the circulation line of a batch digester during two periods of the cooking cycle: The first injection occurred during the heating steps for the purpose of in-situ generation of polysulfide. This chip treatment was studied to explore stabilization against alkaline induced carbohydrate peeling and to increase pulp yield. Under optimum conditions small amounts of polysulfide were produced with yield increase of about 0.5% These increases fell below earlier reports suggesting that unknown differences in liquor composition may influence the relative amounts of polysulfide and thiosulfate generated during the oxidation. Consequently, further studies are required to understand the factors that influence the ratios of those two sulfur species.

W.T. McKean

2000-12-15T23:59:59.000Z

6

Dry Kraft Pulping at Ambient Pressure for Cost Effective Energy Saving and Pollution Deduction  

SciTech Connect (OSTI)

Sponsored by the DOE Industrial Energy Efficiency Grand Challenge program, our research team at the Georgia Institute of Technology conducted laboratory studies and confirmed the concept of making wood pulp using a dry pulping technology. This technology is a new process different from any prior pulping technology used in Kraft and CTMP pulping. Three different kinds of dry pulping methods were investigated. (a) Dry Pulping at Atmospheric Pressure: The first one is to dry and bake the pretreated woodchips in a conventional oven at atmospheric pressure without the use of a catalyst. (b) Dry Pulping at Reduced Pressure: The second method is to dry the pretreated woodchips first in a vacuum oven in the presence of anthraquinone (AQ) as a pulping catalyst, followed by baking at elevated temperature. (c) Liquid Free Chemical Pulping, LFCP. The third method is to first remove the free water of pretreated woodchips, followed by dry pulping using a conventional Kraft pulping digester with AQ and triton as additives. Method one: Experimental results indicated that Dry Pulping at Atmospheric Pressure could produce pulp with higher brightness and lower bulk than conventional Kraft pulp. However, tensile strength of the acquired pulp is much lower than traditional Kraft pulp, and their Kappa number and energy consumption are higher than conventional Kraft pulp. By fully analyzing the results, we concluded that wood fibers might be damaged during the drying process at elevated temperature. The main reason for wood fiber damage is that a long drying time was used during evaporation of water from the woodchips. This resulted in an un-uniform reaction condition on the woodchips: the outside layer of the woodchips was over reacted while inside the woodchips did not reacted at all. To solve this problem, dry pulping at reduced pressure was investigated. Method two: To achieve uniform reaction throughout the entire reaction system, the water inside the pretreated woodchips was evaporated first under vacuum condition at low temperature. Then, the dry woodchips were baked at high temperature (120-130 C) at atmospheric pressure. The qualities of the pulp made with this method were improved compared to that made with method one. The pulp shows higher brightness and lower bulk than Kraft pulping. The tensile strength is significantly higher than the pulp made from the first method. Although the pulp is stronger than that of TMP pulp, it is still lower than conventional Kraft fiber. Method Three: The third dry method was done in a Kraft pulping digester at elevated pressure but without free liquid in the digester. With this method, pulp that has almost the same qualities as conventional Kraft pulp could be produced. The screen yield, Kappa number, fiber brightness, pulp strength and pulp bulk are almost identical to the conventional Kraft pulp. The key advantages of this dry pulping method include ca. 55 % of cooking energy saved during the pulping process, as high as 50 wt% of NaOH saving as well as 3 wt% of Na2S saving comparing to Kraft one. By analyzing fiber properties, yields, chemical and energy consumptions, we concluded that the dry pulping method based on Liquid Free Chemical Pulping, LFCP, could be very attractive for the pulp and paper industry. More fundamental studies and scale up trials are needed to fully commercialize the technology. We expect to conduct pilot trials between 12 to 24 months of period if the DOE or industry can provide continual research funding. Based on the technology we demonstrated in this report, several pilot trial facilities in the United States will be available after small modifications. For example, the Herty Foundation in Savannah, Georgia is one of these potential locations. DOE funding for continuous study and final lead to commercialization of the technique is important.

Yulin Deng; Art Ragauskas

2012-08-28T23:59:59.000Z

7

Producing a True Lignin Depolymerase for Biobleaching Softwood Kraft Pulp  

SciTech Connect (OSTI)

This project constituted an intensive effort devoted to producing, from the white-rot fungus Tramets Cingulata, a lignin degrading enzyme (lignin depolymerase) that is directly able to biobleach or delignify softwood kraft pulp brownstock. To this end, the solutions in which T. cingulata was grown contained dissolved kraft lignin which fulfilled two functions; it behaved as a lignin deploymerase substrate and it also appeared to act as an inducer of enzyme expression. However, the lignin depolymerase isoenzymes (and other extracellular T. cingulata enzymes) interacted very strongly with both the kraft lignin components and the fungal hypae, so the isolating these proteins from the culture solutions proved to be unexpectedly difficult. Even after extensive experimentation with a variety of protein purification techniques, only one approach appeared to be capable of purifying lignin depolymerases to homogeneity. Unfortunately the procedure was extremely laborious; it involved the iso electric focusing of concentrated buffer-exchanged culture solutions followed by electro-elution of the desired protein bands from the appropriate polyacrylamide gel segments

Simo Sarkanen

2002-02-04T23:59:59.000Z

8

Yield Improvement and Energy Savings Uing Phosphonates as Additives in Kraft pulping  

SciTech Connect (OSTI)

Project Objective: Develop a commercially viable modification to the Kraft process resulting in energy savings, increased yield and improved bleachability. Evaluate the feasibility of this technology across a spectrum of wood species used in North America. Develop detailed fundamental understanding of the mechanism by which phosphonates improve KAPPA number and yield. Evaluate the North American market potential for the use of phosphonates in the Kraft pulping process. Examine determinants of customer perceived value and explore organizational and operational factors influencing attitudes and behaviors. Provide an economic feasibility assessment for the supply chain, both suppliers (chemical supply companies) and buyers (Kraft mills). Provide background to most effectively transfer this new technology to commercial mills.

Ulrike W. Tschirner; Timothy Smith

2007-03-31T23:59:59.000Z

9

Combustion of concentrates resulting from ultrafiltration of bleached-kraft effluents  

SciTech Connect (OSTI)

This paper reports that closed cycle concentrates were simulated by laboratory-scale ultrafiltration of (C + D) and first E-stage effluents from two bleached-kraft mills. The concentrates were found to be similar to typical kraft black liquor in carbon content, heating value, and density, Viscosities of concentrates were similar to or slightly above the values over which black liquor viscosities commonly range. Burning rates for the dried solids from the concentrates were found to be similar to burning rates reported for black liquor. Volatiles yields (percentage of initial dried solids evolving as pyrolysis gases under pyrolytic conditions) were 46-50% and were not strongly dependent on final heating temperature. Char yields (percentage of initial dried solids gasified by heterogeneous char oxidation reactions) were strongly dependent on final heating temperature, increasing from nearly zero at 600{degrees} C to 42% at 1000{degrees} C. A simplistic combustion rate model was developed to predict the overall burning rates. It should prove useful for approximating the rates of combustion of ultrafiltration concentrates. The model includes a first-order rate expression for volatiles evolution and a pseudo-first order rate expression for char burning.

Nichols, K.M. (Div. of Chemical and Biological Sciences, Inst. of Paper Science and Technology, Atlanta, GA (US))

1992-04-01T23:59:59.000Z

10

Advanced Modeling and Materials in Kraft Pulp Mills  

SciTech Connect (OSTI)

This CRADA provided technical support to the Weyerhaeuser Company on a number of issues related to the performance and/or selection of materials at a number of locations in a pulp and paper mill. The studies related primarily to components for black liquor recovery boilers, but some effort was directed toward black liquor gasifiers and rolls for paper machines. The purpose of this CRADA was to assist Weyerhaeuser in the evaluation of materials exposed in various paper mill environments and to provide direction in the selection of alternate materials, when appropriate.

Keiser, J.R.; Gorog, J.P.

2002-05-15T23:59:59.000Z

11

PERFORMANCE OF BLACK LIQUOR GASIFIER/GAS TURBINE COMBINED CYCLE COGENERATION IN mE KRAFT PULP  

E-Print Network [OSTI]

PERFORMANCE OF BLACK LIQUOR GASIFIER/GAS TURBINE COMBINED CYCLE COGENERATION IN mE KRAFT PULP high-temperature gasifiers for gas turbine applications. ABB and MTCr/Stonechem are developing low-load performance of gasifier/gas turbine systemsincorporating the four above-noted gasifier designs are reported

12

A Cost-Benefit Assessment of Gasification-Based Biorefining in the Kraft Pulp and Paper Industry  

SciTech Connect (OSTI)

Production of liquid fuels and chemicals via gasification of kraft black liquor and woody residues (''biorefining'') has the potential to provide significant economic returns for kraft pulp and paper mills replacing Tomlinson boilers beginning in the 2010-2015 timeframe. Commercialization of gasification technologies is anticipated in this period, and synthesis gas from gasifiers can be converted into liquid fuels using catalytic synthesis technologies that are in most cases already commercially established today in the ''gas-to-liquids'' industry. These conclusions are supported by detailed analysis carried out in a two-year project co-funded by the American Forest and Paper Association and the Biomass Program of the U.S. Department of Energy. This work assessed the energy, environment, and economic costs and benefits of biorefineries at kraft pulp and paper mills in the United States. Seven detailed biorefinery process designs were developed for a reference freesheet pulp/paper mill in the Southeastern U.S., together with the associated mass/energy balances, air emissions estimates, and capital investment requirements. Commercial (''Nth'') plant levels of technology performance and cost were assumed. The biorefineries provide chemical recovery services and co-produce process steam for the mill, some electricity, and one of three liquid fuels: a Fischer-Tropsch synthetic crude oil (which would be refined to vehicle fuels at existing petroleum refineries), dimethyl ether (a diesel engine fuel or LPG substitute), or an ethanol-rich mixed-alcohol product. Compared to installing a new Tomlinson power/recovery system, a biorefinery would require larger capital investment. However, because the biorefinery would have higher energy efficiencies, lower air emissions, and a more diverse product slate (including transportation fuel), the internal rates of return (IRR) on the incremental capital investments would be attractive under many circumstances. For nearly all of the cases examined in the study, the IRR lies between 14% and 18%, assuming a 25-year levelized world oil price of $50/bbl--the US Department of Energy's 2006 reference oil price projection. The IRRs would rise to as high as 35% if positive incremental environmental benefits associated with biorefinery products are monetized (e.g., if an excise tax credit for the liquid fuel is available comparable to the one that exists for ethanol in the United States today). Moreover, if future crude oil prices are higher ($78/bbl levelized price, the US Department of Energy's 2006 high oil price scenario projection, representing an extrapolation of mid-2006 price levels), the calculated IRR exceeds 45% in some cases when environmental attributes are also monetized. In addition to the economic benefits to kraft pulp/paper producers, biorefineries widely implemented at pulp mills in the U.S. would result in nationally-significant liquid fuel production levels, petroleum savings, greenhouse gas emissions reductions, and criteria-pollutant reductions. These are quantified in this study. A fully-developed pulpmill biorefinery industry could be double or more the size of the current corn-ethanol industry in the United States in terms of annual liquid fuel production. Forest biomass resources are sufficient in the United States to sustainably support such a scale of forest biorefining in addition to the projected growth in pulp and paper production.

Eric D. Larson; Stefano Consonni; Ryan E. Katofsky; Kristiina Iisa; W. James Frederick

2007-03-31T23:59:59.000Z

13

The Effects of Bleached Kraft Pulp-Mill Effluent on Periphyton DOE FRAP 1996-08  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . . . . . . . .15 3.3.4 Polycyclic Aromatic Hydrocarbons . . . . . . . . . . . . . . . . . . .17 3.3.5 Dioxins

14

Effect of raw material and Kraft Pulping Conditions on Characteristics of Dissolved Lignin.  

E-Print Network [OSTI]

?? Lignin is one of the main components in wood and during the chemical pulping processes it is degraded and dissolved into the cooking liquor.… (more)

Svärd, Antonia

2014-01-01T23:59:59.000Z

15

The economical use of standby equipment for a typical Kraft process pulp and paper mill  

E-Print Network [OSTI]

for the pine system is about 350 tons of pulp per day. The ~Pa er Mill The Beater Room - In the beater room the paper making chemicals such as rosin, size, alum, and clay are added to the pulp in a mixing chest. Size is any substance which is added to a... it in on the supposition that it may do some good, Alum, used to denote aluminum sulphate, is used to precipitate the dissolved rosin in the size on the fibers of the paper. This is sometimes referred to as "setting" the size. Alum tends to make the paper hard...

Cox, Elmer Adrain

1955-01-01T23:59:59.000Z

16

Control of the accumulation of non-process elements and organic compounds in pulp mills with bleach filtrate reuse. Quarterly report 3, January--March, 1997  

SciTech Connect (OSTI)

Progress during this quarter is described on four tasks. The first task involves the recovery of organic matter from bleach effluents and black liquors, separation of carbohydrates and lignin degradation products, analysis of functional groups, and characterization of carbohydrate polymers. Progress in the second task was made in the selection of model compounds. Several subtasks are complete in Task 3, but the paper summarizes progress made in the determination of the residual hemicellulose content in the pulp samples. Finally, results are given for the measurement of metal adsorption isotherms on wood pulp. Goals for the next quarter are listed.

Frederick, W.J.; Laver, M.L.; Rorrer, G.L.

1997-05-01T23:59:59.000Z

17

Mill Designed Bio bleaching Technologies  

SciTech Connect (OSTI)

A key finding of this research program was that Laccase Mediator Systems (LMS) treatments on high-kappa kraft could be successfully accomplished providing substantial delignification (i.e., > 50%) without detrimental impact on viscosity and significantly improved yield properties. The efficiency of the LMS was evident since most of the lignin from the pulp was removed in less than one hour at 45 degrees C. Of the mediators investigated, violuric acid was the most effective vis-a-vis delignification. A comparative study between oxygen delignification and violuric acid revealed that under relatively mild conditions, a single or a double LMS{sub VA} treatment is comparable to a single or a double O stage. Of great notability was the retention of end viscosity of LMS{sub VA} treated pulps with respect to the end viscosity of oxygen treated pulps. These pulps could then be bleached to full brightness values employing conventional ECF bleaching technologies and the final pulp physical properties were equal and/or better than those bleached in a conventional ECF manner employing an aggressively O or OO stage initially. Spectral analyses of residual lignins isolated after LMS treated high-kappa kraft pulps revealed that similar to HBT, VA and NHA preferentially attack phenolic lignin moieties. In addition, a substantial decrease in aliphatic hydroxyl groups was also noted, suggesting side chain oxidation. In all cases, an increase in carboxylic acid was observed. Of notable importance was the different selectivity of NHA, VA and HBT towards lignin functional groups, despite the common N-OH moiety. C-5 condensed phenolic lignin groups were overall resistant to an LMS{sub NHA, HBT} treatments but to a lesser extent to an LMS{sub VA}. The inactiveness of these condensed lignin moieties was not observed when low-kappa kraft pulps were biobleached, suggesting that the LMS chemistry is influenced by the extent of delignification. We have also demonstrated that the current generation of laccase has a broad spectrum of operating parameters. Nonetheless, the development of future genetically engineered laccases with enhanced temperature, pH and redox potentials will dramatically improve the overall process. A second challenge for LMS bleaching technologies is the need to develop effective, catalytic mediators. From the literature we already know this is feasible since ABTS and some inorganic mediators are catalytic. Unfortunately, the mediators that exhibit catalytic properties do not exhibit significant delignification properties and this is a challenge for future research studies. Potential short-term mill application of laccase has been recently reported by Felby132 and Chandra133 as they have demonstrated that the physical properties of linerboard can be improved when exposed to laccase without a chemical mediator. In addition, xxx has shown that the addition of laccase to the whitewater of the paper machine has several benefits for the removal of colloidal materials. Finally, this research program has presented important features on the delignification chemistry of LMS{sub NHA} and LMS{sub VA} that, in the opinion of the author, are momentous contributions to the overall LMS chemistry/biochemistry knowledge base which will continue to have future benefits.

Institute of Paper Science Technology

2004-01-30T23:59:59.000Z

18

Novel Pulping Technology: Directed Green Liquor Utilization (D-GLU) Pulping  

SciTech Connect (OSTI)

The general objectives of this new project are the same as those described in the original proposal. Conventional kraft pulping technologies will be modified for significant improvements in pulp production, such as strength, bleachability, and yield by using green liquor, a naturally high, kraft mill-derived sulfidity source. Although split white liquor sulfidity and other high sulfidity procedures have the promise of addressing several of the latter important economic needs of pulp mills, they require considerable engineering/capital retrofits, redesigned production methods, and thus add to overall mill expenditures. Green liquor use, however, possesses the required high sulfidity to obtain in general the benefits attributable to higher sulfidity cooking, without the required capital constraints for implementation. Before introduction of green liquor in our industrial operations, a stronger understanding of its fundamental chemical interaction with the lignin and carbohydrates in US hardwood and softwoods must be obtained. In addition, its effect on bleachability, enhancement of pulp properties, and influence on the overall energy and recovery of the mill requires further exploration before the process witnesses widespread mill use in North America. Thus, proof of principle will be accomplished in this work and the consequent effect of green liquor and other high sulfide sources on the pulping and bleaching operations will be explored for US kraft mills. The first year of this project will generate the pertinent information to validate its ability for implementation in US pulping operations, whereas year two will continue this work while proceeding to analyze pulp bleachability and final pulp/paper properties and develop a general economic and feasibility analysis for its eventual implementation in North America.

Lucian A. Lucia

2005-11-15T23:59:59.000Z

19

High-solids black liquor firing in pulp and paper industry kraft recovery boilers: Phase Ia - Low-temperature gasifier evaluation. Final report, November 1, 1995--October 31, 1996  

SciTech Connect (OSTI)

This project, conducted under The United States Department of Energy (DOE) Cooperative Agreement DE-FC36-94GO10002/A002, was part of a multiple-phase effort to develop technologies that improve the energy efficiency and economics of chemical process recovery in the pulp and paper industry. The approach taken was to consider two major alternatives in two phases. Phase I, conducted previously, considered means to improve pulp mill recovery boilers using high-solids advanced combustion of black liquor; while this project, Phase la, considered means to recover kraft pulping mill process chemicals by low-temperature black liquor gasification. The principal steps previously proposed in this program were: (1) Evaluate these two technologies, high-solids advanced combustion and gasification, and then select a path forward using the more promising of these two options for future work. (2) Design and construct a pilot-scale unit based on the selected technology, and using that unit, develop the precompetitive data necessary to make commercialization attractive. (3) Develop and deploy a first-of-a-kind (FOAK) commercial unit in a kraft pulp mill. Phase I, which evaluated the high-solids advanced combustion option, was concluded in 1995. Results of that project phase were reported previously. This report describes the work conducted in Phase Ia. The work is described in Sections 1 through 4 and six appendices provide additional detail.

Southards, W.T.; Blude, J.D.; Dickinson, J.A. [and others

1997-06-01T23:59:59.000Z

20

Assessment of Gasification-Based Biorefining at Kraft Pulp and Paper Mills in the United States, Part A: Background and Assumptions  

SciTech Connect (OSTI)

Commercialization of black liquor and biomass gasification technologies is anticipated in the 2010-2015 time frame, and synthesis gas from gasifiers can be converted into liquid fuels using catalytic synthesis technologies that are already commercially established in the gas-to-liquids or coal-to-liquids industries. This set of two papers describes key results from a major assessment of the prospective energy, environmental, and financial performance of commercial gasification-based biorefineries integrated with kraft pulp and paper mills [1]. Seven detailed biorefinery designs were developed for a reference mill in the southeastern United States, together with the associated mass/energy balances, air emissions estimates, and capital investment requirements. The biorefineries provide chemical recovery services and co-produce process steam for the mill, some electricity, and one of three liquid fuels: a Fischer-Tropsch synthetic crude oil (which could be refined to vehicle fuels at an existing petroleum refinery), dimethyl ether (a diesel engine fuel or propane substitute), or an ethanol-rich mixed-alcohol product. This paper describes the key assumptions that underlie the biorefinery designs. Part B will present analytical results.

Larson, E. D.; Consonni, S.; Katofsky, R. E.; Iisa, K.; Frederick, W. J., Jr.

2008-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Biological Kraft Chemical Recycle for Augmentation of Recovery Furnace Capacity  

SciTech Connect (OSTI)

The chemicals used in pulping of wood by the kraft process are recycled in the mill in the recovery furnace, which oxidizes organics while simultaneously reducing sulfate to sulfide. The recovery furnace is central to the economical operation of kraft pulp mills, but it also causes problems. The total pulp production of many mills is limited by the recovery furnace capacity, which cannot easily be increased. The furnace is one of the largest sources of air pollution (as reduced sulfur compounds) in the kraft pulp mill.

Stuart E. Strand

2001-12-06T23:59:59.000Z

22

Kraft Liquor Corrosion Margaret Gorog  

E-Print Network [OSTI]

1 Kraft Liquor Corrosion Margaret Gorog Federal Way, WA Pulp and Paper Corrosion Symposium Georgia Tech Renewable Bioproducts Institute November 2014 · Brown Stock Corrosion · Alkaline Liquor Corrosion · Black Liquor Corrosion ­ Evaporators ­ Research · High Solids Black Liquor Corrosion of Stainless Steel

Das, Suman

23

Kraft lignin recovery by ultrafiltration: economic feasibility and impact on the kraft recovery system  

SciTech Connect (OSTI)

The widespread use of the kraft pulping process could provide a ready supply of lignin materials for many uses. Simulation studies demonstrate that recovery of the high-molecular-weight kraft lignin by ultrafiltration of a fraction of the black liquor flow is attractive from both an economic and an operational standpoint. Benefits are derived from relief of a furnace-limited recovery system and from the marketing of the lignin or modified lignin products. 10 references.

Kirkman, A.G.; Gratzl, J.S.; Edwards, L.L.

1986-05-01T23:59:59.000Z

24

High-solids black liquor firing in pulp and paper industry Kraft recovery boilers. Final report, Phase 1, Volume 1: Executive summary  

SciTech Connect (OSTI)

This project is a multiple-phase effort to develop technologies to improve high-solids black liquor firing in pulp mill recovery boilers. The objectives are to develop a preliminary design of a recovery furnace simulator; evaluate the economics of high-solids; and delineate a project concept for evaluating candidate technologies to improve chemical recovery.

Southards, W.T.; Clement, J.L.; McIlroy, R.A.; Tharp, M.R.; Verrill, C.L.; Wessell, R.A.

1995-11-01T23:59:59.000Z

25

Kraft black liquor combustion: Advancement in fundamental understanding  

SciTech Connect (OSTI)

Self-generated fuel streams plus purchased fossil fuel and power supply the pulp and paper industry with its energy requirements. The total industry energy use for 1986 was approximately 2.3 Quad (2300 trillion Btus). Self-generated and residue fuels accounted for 57% of the energy requirements. Spent pulping liquors provide the single largest self-generated energy source, approximately one Quad (900 trillion Btus). The pulp and paper industry also leads the nation in cogeneration performance. In 1986 eighty-nine percent (89%) of the 46 billion KWHs generated were produced by cogeneration. Spent pulping liquors supply the single largest fuel source (35%) to these cogeneration facilities. Spent pulping liquors consist of solubilized wood organics, spent inorganic chemicals, and water. Since kraft pulp dominates the North American market, 74%, kraft black liquor is the dominant spent pulping liquor. Effective recovery of high level energy and chemicals from black liquor contributes heavily toward dominance of kraft pulping. The kraft chemical recovery cycle centers around the recovery boiler. Kraft recovery boilers have been commercially available for over 50 years. The potential still exists, however, for significant improvements in energy recovery and black liquor throughput. Potential energy benefits from black liquor combustion research amount to 30 trillion Btus. Energy recovery increases often are an additional benefit from modifications made to increase black liquor throughput. Capacity increases of at least 5% are often achievable. Increased energy productivity of the kraft chemical recovery boiler will come by incorporation of improved fundamental knowledge into the technology used for boiler upgrades and new boiler construction. 5 refs., 9 figs.

Clay, D.T.

1987-10-01T23:59:59.000Z

26

Control of the accumulation of non-process elements and organic compounds in pulp mills with bleach filtrate reuse. Quarterly report, October--December 1996  

SciTech Connect (OSTI)

A portion of each filtrate sample was freeze-dried and the resulting solids were analyzed for ash content. Adsorption experiments with calcium and barium were carried at 70{degrees}C in a temperature controlled incubator under continuous mixing in order to simulate the environment experienced by brownstock as it moves through the Q stage. In the calcium experiments, it was difficult to accurately determine the calcium adsorbed on the pulp by measuring the depletion of calcium in the aqueous phase. Consequently, the technique was modified. In the modified technique, the calcium-adsorbed pulp is acid washed again to release the calcium. The calcium concentration in the washings is measured, and the calcium adsorbed on the pulp is estimated by material balance. Measurement of calcium adsorption on the brownstock pulp fibers from the L-P/Samoa mill have been obtained.

Frederick, W.J.; Laver, M.L.; Rorrer, G.L.

1996-12-31T23:59:59.000Z

27

High-solids black liquor firing in pulp and paper industry kraft recovery boilers. Quarterly report, Phase 1a: Black liquor gasifier evaluation  

SciTech Connect (OSTI)

This project phase addresses the following workscope: Conduct bench-scale tests of a low temperature, partial combustion gasifier; Prepare a gasifier pilot-plant preliminary design and cost estimate and prepare a budgetary cost estimate of the balance of the program; Outline a test program to evaluate gasification; Prepare an economic/market analysis of gasification and solicit pulp and paper industry support for subsequent phases; and Prepare a final report and conduct a project review prior to commencement of work leading to construction of any pilot scale components or facilities. The primary accomplishments included completion of installation of the bench-scale black liquor gasifier and supporting systems, preparing test plans and related safety procedures and detailed operating procedures, defining the functional design requirements and outlining the test plans for the pilot-scale gasifier, and preparing a preliminary economic assessment of the black liquor gasifier. This work accomplished under Phase 1a during this period is further described by task.

NONE

1996-07-01T23:59:59.000Z

28

High-solids black liquor firing in pulp and paper industry kraft recovery boilers: Phase 1 -- Final report. Volume 2: Project technical results  

SciTech Connect (OSTI)

This project is a multiple-phase effort to develop technologies to improve high-solids black liquor firing in pulp mill recovery boilers. The principal means to this end is to construct and operate a pilot-scale recovery furnace simulator (RFS) in which these technologies can be tested. The Phase 1 objectives are to prepare a preliminary design for the RFS, delineate a project concept for evaluating candidate technologies, establish industrial partners, and report the results. Phase 1 addressed the objectives with seven tasks: Develop a preliminary design of the RFS; estimate the detailed design and construction costs of the RFS and the balance of the project; identify interested parties in the paper industry and key suppliers; plan the Phase 2 and Phase 3 tests to characterize the RFS; evaluate the economic justification for high-solids firing deployment in the industry; evaluate high-solids black liquor property data to support the RFS design; manage the project and reporting results, which included planning the future program direction.

Southards, W.T.; Clement, J.L.; McIlroy, R.A.; Tharp, M.R.; Verrill, C.L.; Wessell, R.A.

1995-11-01T23:59:59.000Z

29

Control of the accumulation of non-process elements and organic compounds in pulp mills with bleach filtrate reuse. Milestones and progress, Quarter 8 (April 1--June 30, 1998)  

SciTech Connect (OSTI)

Overall, this project is on schedule and proceeding as planned. Two approach changes are recommended. One is to rely on commercially developed software, in particular that developed by OLI Systems, Inc., and now being expanded in a collaborative effort between OLI Systems, Inc. and IPST to provide a simulation package for the pulp and paper industry and to integrate it with existing process simulation tools used by that industry. The second is the development of a detailed brownstock/bleached fiber washer model as a tool to evaluate the data and methods developed in this study, and to demonstrate its utility to industry. Both of these are discussed in more detail in the Approach Changes section of this report. Two tasks are behind schedule. They are Task A-2.3, Measurement of stability constants for wood organics with metal ions (scheduled completion date: 6/98), and Task C-1.2, Estimation of unavailable thermodynamic parameters (scheduled completion date: 12/97). The reasons and expected completion dates for these tasks are discussed in the Performance Variances and Open Items section of this report. All other tasks are either completed, or on or ahead of schedule.

Frederick, W.J.; Laver, M.L.; Rorrer, G.L.; Rudie, A.W.; Schmidl, W.

1998-08-01T23:59:59.000Z

30

Physical properties of Kraft Black Liquor. Interim report, Phase II  

SciTech Connect (OSTI)

Objectives are to determine the rheological, thermal, and surface properties of Kraft Black Liquors, and to relate these properties to the chemical composition and to pulping conditions. A four-variable, multi-level pulping experiment is being conducted. Pulping results are reported. Complete analyses of the liquors have been done. Thermal analyses have been done. DSC was employed to determine heat capacities of black liquors and lignins. Rheological (viscosity) studies are being conducted. Density and thermal expansion have been studied for seven liquors. Energy savings through more efficient recovery systems are appreciable.

Fricke, A.L.

1985-03-01T23:59:59.000Z

31

Bubble Size Control to Improve Oxygen-Based Bleaching: Characterization of Flow Regimes in Pulp-Water-Gas Three-Phase Flows  

SciTech Connect (OSTI)

Flow characteristics of fibrous paper pulp-water-air slurries were investigated in a vertical circular column 1.8 m long, with 5.08 cm diameter. Flow structures, gas holdup (void fraction), and the geometric and population characteristics of gas bubbles were experimentally investigated, using visual observation, Gamma-ray densitometry, and flash X-ray photography. Five distinct flow regimes could be visually identified: dispersed bubbly, layered bubbly, plug, churn-turbulent, and slug. Flow regime maps were constructed, and the regime transition lines were found to be sensitive to consistency. The feasibility of using artificial neural networks (ANNs) for the identification of the flow regimes, using the statistical characteristics of pressure fluctuations measured by a single pressure sensor, was demonstrated. Local pressure fluctuations at a station were recorded with a minimally-intrusive transducer. Three-layer, feed-forward ANNs were designed that could identify the four major flow patterns (bubbly, plug, churn, and slug) well. The feasibility of a transportable artificial neural network (ANN) - based technique for the classification of flow regimes was also examined. Local pressures were recorded at three different locations using three independent but similar transducers. An ANN was designed, trained and successfully tested for the classification of the flow regimes using one of the normalized pressure signals (from Sensor 1). The ANN trained and tested for Sensor 1 predicted the flow regimes reasonably well when applied directly to the other two sensors, indicating a good deal of transportability. An ANN-based method was also developed, whereby the power spectrum density characteristics of other sensors were adjusted before they were used as input to the ANN that was based on Sensor 1 alone. The method improved the predictions. The gas-liquid interfacial surface area concentration was also measured in the study. The gas absorption technique was applied, using CO2 as the transferred species and sodium hydroxide as the alkaline agent in water. Statistical analysis was performed to identify the parametric dependencies. The experimental data were empirically correlated.

S.M. Ghiaasiaan and Seppo Karrila

2006-03-20T23:59:59.000Z

32

Molecular weight and molecular weight distribution of kraft lignins  

SciTech Connect (OSTI)

Kraft lignins are the lignin degradation products from kraft pulping. They are complex, heterogeneous polymers with some polar character. The molecular weight of kraft lignins greatly affect the physical properties of black liquors, and are of primary importance in separation from black liquor and in evaluating potential uses. Several purified kraft lignins from slash pine were analyzed for number average molecular weight by vapor pressure osmometry (VPO), for weight average molecular weight by low angle laser light scattering (LALLS), and for the molecular weight distribution by high temperature size exclusion chromatography (SEC). The lignins were run in tetrahydrofuran (THF), N,N-dimethyl formamide (DMF), DMF with 0.1M LiBr, and pyridine at conditions above the Theta temperature. Experimental methods are discussed. The results show that VPO may be used to determine M[sub n] for kraft lignins if the purity of the lignins and the identity of the impurities are known. LALLS can be used to determine M[sub w] for kraft lignins if measurements are made at or above the Theta temperature of the lignin-solvent pair. SEC should be used at temperatures at, or above, the Theta temperature of the lignin-solvent pair. Size separation is highly dependent on the solvent used, and DMF is a much better solvent than THF for high temperature SEC. Future work using moment resolution procedures to derive an accurate calibration curve are also discussed.

Schmidl, W.; Dong, D.; Fricke, A.L. (Univ. of Florida, Gainesville, FL (United States))

1990-01-01T23:59:59.000Z

33

Simultaneous and rapid determination of multiple component concentrations in a Kraft liquor process stream  

DOE Patents [OSTI]

The present invention is a rapid method of determining the concentration of the major components in a chemical stream. The present invention is also a simple, low cost, device of determining the in-situ concentration of the major components in a chemical stream. In particular, the present invention provides a useful method for simultaneously determining the concentrations of sodium hydroxide, sodium sulfide and sodium carbonate in aqueous kraft pulping liquors through use of an attenuated total reflectance (ATR) tunnel flow cell or optical probe capable of producing a ultraviolet absorbency spectrum over a wavelength of 190 to 300 nm. In addition, the present invention eliminates the need for manual sampling and dilution previously required to generate analyzable samples. The inventive method can be used in Kraft pulping operations to control white liquor causticizing efficiency, sulfate reduction efficiency in green liquor, oxidation efficiency for oxidized white liquor and the active and effective alkali charge to kraft pulping operations.

Li, Jian (Marietta, GA); Chai, Xin Sheng (Atlanta, GA); Zhu, Junyoung (Marietta, GA)

2008-06-24T23:59:59.000Z

34

The Fractionation of Loblolly Pine Woodchips Into Pulp For Making Paper Products  

SciTech Connect (OSTI)

The overall goal of the project was to test the PureVision biomass fractionation technology for making pulp from loblolly pine. A specific goal was to produce a pulp product that is comparable to pulp produced from the kraft process, while reducing the environmental effects of the kraft process, known to be a highly pollutant process. The overall goal of the project was met by using the biomass fractionation concept for making pulp product. This proof-of-concept study, done with Southern pine pinchips as feedstock, evaluated NaOH concentration and residence time as variables in single-stage cocurrent pulping process. It can be concluded that 1% NaOH is adequate for effective delignification using the PureVision process; this is about ? of that used in the kraft process. Also, the PureVision process does not use sulfur-based chemicals such as N2S and hence, is environmentally more benign.

Kiran Kadam, PhD

2006-11-30T23:59:59.000Z

35

Minimizing the sulphur content in Kraft lignin.  

E-Print Network [OSTI]

?? The aim of this project is to investigate the possibilities of minimizing the sulphur content in Kraft lignin. Kraft lignin contains about 1.5 to… (more)

Svensson, Sara

2008-01-01T23:59:59.000Z

36

A comprehensive program to develop correlations for physical properties of kraft black liquor. Final report  

SciTech Connect (OSTI)

The overall objective of the program was to develop correlations to predict physical properties within requirements of engineering precision from a knowledge of pulping conditions and of kraft black liquor composition, if possible. These correlations were to include those relating thermodynamic properties to pulping conditions and liquor composition. The basic premise upon which the research was based is the premise that black liquor behaves as a polymer solution. This premise has proven to be true, and has been used successfully in developing data reduction methods and in interpreting results. A three phase effort involving pulping, analysis of liquor composition, and measurement of liquor properties was conducted.

Fricke, A.L.; Zaman, A.A.

1998-05-01T23:59:59.000Z

37

Carbon Fiber Production from a Kraft Hardwood Lignin  

SciTech Connect (OSTI)

Lignin is a renewable resource material that is being evaluated for the low cost production of carbon fiber for automotive and other applications. Solvent extraction of a commercial hardwood lignin product yielded a purified lignin free of the contaminants typical of lignins derived from the Kraft chemical pulping of wood. The purified lignin was highly melt-spinnable into fibers, from which carbon fiber was subsequently produced. The lignin has been evaluated in terms of its rheological properties, fiber melt spinning ability, and potential for manufacture of low cost carbon fiber without the need for plasticizing agents or chemical modifications.

Baker, Darren A [ORNL; Gallego, Nidia C [ORNL; Baker, Frederick S [ORNL

2008-01-01T23:59:59.000Z

38

Ultrafiltration of kraft black liquor: Final report, Phase 3  

SciTech Connect (OSTI)

Since 1981, a research program has been in progress to determine the physical properties of kraft black liquors and to develop methods for reduction of data and correlation of properties with pumping conditions. The basic premise that has been used to direct the research program is that kraft black liquor behaves as a polymer solution, particularly at high solids, and that the behavior is dominated by the characteristics of the lignin present. This premise is proving to be correct, and the principles that follow from this premise are proving to be successful for data reduction and correlation. The research has been a complex program involving experimental pulping, chemical analysis, lignin separation and characterization, thermal analysis, rheological measurements, and considerable equipment and methods development. Due to the complexity of the program, the unforeseen need to expend a great deal of effort in development of experimental techniques for analysis, and the fact that our liquors proved to be unstable at high temperatures and solids, all of the original objectives could not be accomplished. However, our program has added substantially to the body of knowledge of physical properties of black liquor. Our results indicate that the goal of developing correlations for physical properties of kraft black liquor is practical and can be realized through extension of the present work. 21 refs., 32 figs.

Hill, M.K.

1988-04-01T23:59:59.000Z

39

Field Comparison of the Sampling Efficacy of Two Smear Media: Cotton Fiber and Kraft Paper  

SciTech Connect (OSTI)

Two materials were compared in field tests at the Defense Waste Processing Facility: kraft paper (a strong, brown paper made from wood pulp prepared with a sodium sulfate solution) and cotton fiber. Based on a sampling of forty-six pairs of smears, the cotton fiber smears provide a greater sensitivity. The cotton fiber smears collected an average of forty-four percent more beta activity than the kraft paper smears and twenty-nine percent more alpha activity. Results show a greater sensitivity with cotton fiber over kraft paper at the 95 percent confidence level. Regulatory requirements for smear materials are vague. The data demonstrate that the difference in sensitivity of smear materials could lead to a large difference in reported results that are subsequently used for meeting shipping regulations or evaluating workplace contamination levels.

Hogue, M.G.

2002-02-07T23:59:59.000Z

40

Control of the accumulation of non-process elements and organic compounds in pulp mills with bleach filtrate reuse. Milestones and progress, Quarter 9 (July 1--September 30, 1998)  

SciTech Connect (OSTI)

The two approach changes that were discussed and recommended in the Quarter 8 (April 1--June 30, 1998) progress report have been implemented in the current project plan. The OLI software has been used to develop a preliminary process model for predicting the distribution of NPE`s in a two stage brownstock washer, and the OLI database has been upgraded to include improved chemical equilibrium data for metal-organic interactions. This exercise served as a tool to evaluate the data and methods developed in this study, and to demonstrate its utility to industry. The Weyerhaeuser-NAELS software has also been applied to predicting inorganic solubility behavior. Task C-1.2, Estimation of unavailable thermodynamic parameters (scheduled completion date: 12/97), has been combined with Task D-2.1, Evaluation of the estimation procedure (scheduled completion date: 3/99) with a new scheduled completion date of 8/99. A model for the adsorption of metal ions on wood pulp fibers will include transport effects as well as adsorption equilibrium, and will be combined with a brownstock washer model to evaluate its predictive capability in comparison with mill data, and to demonstrate the applicability of the results obtained in this project. Three tasks are behind schedule: Task A-2.3, Measurement of stability constants for wood organics with metal ions (scheduled completion date: 6/98), Task B-2.1, Measure metal adsorption isotherms on wood pulp (scheduled completion date: 9/97), and Task B-2.3, Measure metal ion adsorption kinetics for strongly adsorbing metal species (scheduled completion date: 3/98). The reasons and expected completion dates are discussed in the Performance Variances and Open Items section. All other tasks are either completed, on, or ahead of schedule.

Frederick, W.J.; Laver, M.L.; Rorrer, G.L.; Rudie, A.W.; Schmidl, W.

1998-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Continuous on-line measurement of lignin concentration in wood pulp  

SciTech Connect (OSTI)

We are working toward the development of an instrument for the continuous, on-line measurement of the lignin concentration in wood pulp. The instrument is based on laser induced fluorescence of the wood pulp and is to be used as a primary sensor for both feedback control of the pulping and feedforward control of bleaching. We report here the results of a series of laboratory tests that characterized the fluorescence properties of wood pulp and demonstrated a correlation between various fluorescence functions and the Kappa number of the pulps as determined by TAPPI Procedure T236.

Jeffers, L.A.; Roman, G.W.

1994-06-01T23:59:59.000Z

42

Lowering kraft black liquor viscosity of ultrafiltration  

SciTech Connect (OSTI)

High viscosity is a major factor limiting the percentage total dissolved solids (%TDS) to which kraft black liquor (KBL), a spent pulping liquor, can be concentrated before it is burned to recover its fuel value and its inorganic chemicals. The effect on black liquor viscosity of removing high molecular weight lignin by ultrafiltration of 16% and 24% TDS liquors was studied. Viscosities of ultrafiltration permeates were reduced relative to feed black liquors. When a permeate was concentrated to higher %TDS levels, its viscosity decreased yet further relative to feed samples evaporated to similar solids levels. Retentate viscosity was very high relative to both feed and permeate. Ultrafiltration was carried out at 75/degrees/C using polysulfone membranes in a plate-and-frame or hollow fiber system. Flux rates varied greatly depending upon the specific liquor used. Flux was enhanced by increased temperature and increased linear velocity. The membrane molecular weight cutoff (MWCO) typically used was 50,000; increasing 100,000 or 200,000 did not enhance flux.

Hill, M.K.; Violette, D.A.; Woerner, D.L.

1988-10-01T23:59:59.000Z

43

Integration of the Mini-Sulfide Sulfite Anthraquinone (MSS-AQ) Pulping Process and Black Liquor Gasification in a Pulp Mill  

SciTech Connect (OSTI)

As many of the recovery boilers and other pieces of large capital equipment of U.S. pulp mills are nearing the end of their useful life, the pulp and paper industry will soon need to make long-term investments in new technologies. The ability to install integrated, complete systems that are highly efficient will impact the industry’s energy use for decades to come. Developing a process for these new systems is key to the adoption of state-of-the-art technologies in the Forest Products industry. This project defined an integrated process model that combines mini-sulfide sulfite anthraquinone (MSS-AQ) pulping and black liquor gasification with a proprietary desulfurization process developed by the Research Triangle Institute. Black liquor gasification is an emerging technology that enables the use of MSS-AQ pulping, which results in higher yield, lower bleaching cost, lower sulfur emissions, and the elimination of causticization requirements. The recently developed gas cleanup/absorber technology can clean the product gas to a state suitable for use in a gas turbine and also regenerate the pulping chemicals needed to for the MSS-AQ pulping process. The combination of three advanced technologies into an integrated design will enable the pulping industry to achieve a new level of efficiency, environmental performance, and cost savings. Because the three technologies are complimentary, their adoption as a streamlined package will ensure their ability to deliver maximum energy and cost savings benefits. The process models developed by this project will enable the successful integration of new technologies into the next generation of chemical pulping mills. When compared to the Kraft reference pulp, the MSS-AQ procedures produced pulps with a 10-15 % yield benefit and the ISO brightness was 1.5-2 times greater. The pulp refined little easier and had a slightly lower apparent sheet density (In both the cases). At similar levels of tear index the MSS-AQ pulps also produced a comparable tensile and burst index pulps. Product gas composition determined using computer simulations The results demonstrate that RVS-1 can effectively remove > 99.8% of the H2S present in simulated synthesis gas generated from the gasification of black liquor. This level of sulfur removal was consistent over simulated synthesis gas mixtures that contained from 6 to 9.5 vol % H2S.A significant amount of the sulfur in the simulated syngas was recovered as SO2 during regeneration. The average recovery of sulfur as SO2 was about 75%. Because these are first cycle results, this sulfur recovery is expected to improve. Developed WINGems model of the process.The total decrease in variable operating costs for the BLG process compared to the HERB was in excess of $6,200,000 per year for a mill producing 350,000 tons of pulp per year. This represents a decrease in operating cost of about $17.7/ton of oven dry pulp produced. There will be additional savings in labor and maintenance cost that has not been taken into account. The capital cost for the MSSAQ based gasifier system was estimated at $164,000,000, which is comparable to a High Efficiency Recovery Boiler. The return on investment was estimated at 4%. A gasifier replacement cannot be justified on its own, however if the recovery boiler needs to be replaced the MSSAQ gasifier system shows significantly higher savings. Before black liquor based gasifer technology can be commercialized more work is necessary. The recovery of the absorbed sulfur in the absorbent as sulfur dioxide is only 75%. This needs to be greater than 90% for economical operation. It has been suggested that as the number of cycles is increased the sulfur dioxide recovery might improve. Further research is necessary. Even though a significant amount of work has been done on a pilot scale gasifiers using liquors containing sulfur, both at low and high temperatures the lack of a commercial unit is an impediment to the implementation of the MSSAQ technology. The implementation of a commercial unit needs to be facilated before the benefits of

Hasan Jameel, North Carolina State University; Adrianna Kirkman, North Carolina State University; Ravi Chandran,Thermochem Recovery International Brian Turk Research Triangle Institute; Brian Green, Research Triangle Institute

2010-01-27T23:59:59.000Z

44

Information KraftMcMillan  

E-Print Network [OSTI]

CSC310 -- Information Theory Sam Roweis Lecture 3: Proving the Kraft­McMillan Inequalities) Modeling. We have to represent the stochastic behaviour of the source and the channel using probabilistic. Review: Mathematical Setup 3 . A stochastic source emits a sequence of symbols (from alphabet A) X = X1

Roweis, Sam

45

Modification of alkaline pulping to facilitate the isolation of aliphatic acids. Part 1. Sodium hydroxide pretreatment of pine wood  

SciTech Connect (OSTI)

Pretreating pine chips (Pinus sylvestris) with sodium hydroxide prior to the alkaline delignification kraft, kraft-anthraquinone, and soda-anthraquinone) can facilitate the recovery of the carbohydrate degradation products from alkaline pulping liquors. Under suitable pretreatment conditions large amounts of carbohydrate degradation products (alipahtic acids) were formed relative to lignin. The lignin fraction was composed of comparatively low-molecular-weight fragments. Although the delignification was considerably retarded and the yield (based on wood) was decreased by 1-3%, the properties of the resulting pulp were essentially maintained despite pretreatment. Finally, data are given for the composition of aliphatic acids in liquors resulting from pretreatments.

Alen, R.; Niemelae, K.; Sjoestroem, E.

1984-01-01T23:59:59.000Z

46

Composite tube cracking in kraft recovery boilers: A state-of-the-art review  

SciTech Connect (OSTI)

Beginning in the mid-1960s, increasing energy costs in Finland and Sweden made energy recovery more critical to the cost-effective operation of a kraft pulp mill. Boiler designers responded to this need by raising the steam operating pressure, but almost immediately the wall tubes in these new boilers began to corrode rapidly. Test panels installed in the walls of the most severely corroding boiler identified austenitic stainless steel as sufficiently resistant to the new corrosive conditions, and discussions with Sandvik AB, a Swedish tube manufacturer, led to the suggestion that coextruded tubes be used for water wall service in kraft recovery boilers. Replacement of carbon steel by coextruded tubes has solved most of the corrosion problems experienced by carbon steel wall tubes, however, these tubes have not been problem-free. Beginning in early 1995, a multidisciplinary research program funded by the US Department of Energy was established to investigate the cause of cracking in coextruded tubes and to develop improved materials for use in water walls and floors of kraft recovery boilers. One portion of that program, a state-of-the-art review of public- and private-domain documents related to coextruded tube cracking in kraft recovery boilers is reported here. Sources of information that were consulted for this review include the following: tube manufacturers, boiler manufacturers, public-domain literature, companies operating kraft recovery boilers, consultants and failure analysis laboratories, and failure analyses conducted specifically for this project. Much of the information contained in this report involves cracking problems experienced in recovery boiler floors and those aspects of spout and air-port-opening cracking not readily attributable to thermal fatigue. 61 refs.

Singbeil, D.L.; Prescott, R. [Pulp and Paper Research Inst. of Canada, Vancouver, British Columbia (Canada); Keiser, J.R.; Swindeman, R.W. [Oak Ridge National Lab., TN (United States)

1997-07-01T23:59:59.000Z

47

Separation of kraft lignin from kraft black liquor: Final report, July 1984-April 1987  

SciTech Connect (OSTI)

The importance of this work is related to the fact that with over 16 million tons of kraft lignin available annually, practically all of it is burned just for its heat value. In essence, kraft lignin has no real value except its heat value. The major accomplishments of this research has shown that it is possible to produce high purity kraft lignin from kraft black liquor. This patented technology represents a way of producing a material that can be utilized in a wide variety of markets. Kraft lignin that was produced using this technology was sent to major corporations who used this kraft lignin as a starting material in their chemical processes. 3 figs.

Kurple, K.R.

1988-04-15T23:59:59.000Z

48

Duplex stainless steels for the pulp and paper industry  

SciTech Connect (OSTI)

The metallurgy and corrosion resistance of duplex stainless steel, particularly with regards to applications in the pulp and paper industry, are described. Practical experiences from pressure vessel installations in cooking plants and bleach plants as well as from non-pressurized items in different parts along the fiber line, are given. The paper also reviews corrosion test results presented previously and compares these with recent test data and the practical experiences. Though most of the installations have been successful, some cases of corrosion attacks on duplex stainless steel have been reported, although these are very limited in number: one digester, one calorifier, two pulp storage towers, and two bleach plant filter washers, of a total of more than 700 identified installations.

Alfonsson, E.; Olsson, J.

1999-07-01T23:59:59.000Z

49

Final Technical Report Steam Cycle Washer for Unbleached Pulp  

SciTech Connect (OSTI)

Project Abstract for “Steam Cycle Washer for Unbleached Pulp” When completed, the patented SC Washer will provide an innovative, energy efficient demonstration project to wash unbleached pulp using a pressure vessel charged with steam. The Port Townsend Paper Corporation’s pulp mill in Port Townsend, WA was initially selected as the host site for conducting the demonstration of the SCW. Due to 2006 and 2007 delays in the project caused by issues with 21st Century Pulp & Paper, the developer of the SCW, and the 2007 bankruptcy proceedings and subsequent restructuring at Port Townsend Paper, the mill can no longer serve as a host site. An alternate host site is now being sought to complete the commercial demonstration of the Steam Cycle Washer for Unbleached Pulp. Additionally, estimated costs to complete the project have more than doubled since the initial estimates for the project were completed in 2002. Additional grant funding from DOE was sought and in July, 2008 the additional DOE funds were procured under a new DOE award, DE-PS36-08GO98014 issued to INL. Once the new host site is secured the completion of the project will begin under the management of INL. Future progress reports and milestone tracking will be completed under requirements of new DOE Award Number DE-PS36-08GO98014. The following are excerpts from the project Peer Review completed in 2006. They describe the project in some detail. Additional information can be found by reviewing DOE Award Number: DE-PS36-08GO98014. 5. Statement of Problem and Technical Barriers: The chemical pulping industry is one of the major users of fresh water in the United States. On average the industry uses over 80 tons of water to produce one ton of pulp, some states use up to 50% more (Washington 120 and Wisconsin 140). In order to process one ton of pulp using 80 tons of process water, a large amount of: • energy is used in process heat and • power is required for pumping the large volume of pulp slurries through the pulping phases. Most water used in the pulping process ends up as warm waste water in the mill’s effluent discharge, which subsequently pollutes receiving waterways and carries an enormous amount of energy with it. Wash water reduction in brown stock washing with the Steam Cycle Washers (SCW) will save energy, up to 1+ million BTUs per ton of pulp in the evaporators alone. Reduction of liquid volume through bleaching stages will save process heat energy in the amount of 2+ million BTUs per ton of pulp, and as much as 80 – 100 kWhrs of electrical power per ton of pulp due to reduced pumping costs. Currently, the technical barriers to water reduction in chemical pulping are basically as follows: • conventional pulp washers wash the pulp at 10 - 14% consistency, • conventional pulp washers use 12 – 16 tons of wash water per ton of pulp, and • they leave 30 – 70 lbs of soda (Na2SO4) per ton of pulp as soda loss into the washed pulp. The amount of wash water in excess of the amount of process liquid in the pulp is called Dilution Factor (DF), even though it is not a factor in the mathematical sense but an addition. Modern pulp washing lines can wash efficiently with a DF of 3 but most pulp mills in the United States are washing with a DF of 5-7. Therefore, at 10% washing consistency 14-16 tons of wash water is required and 14% consistency requires 11-13 tons of wash water.

Starkey, Yvonne; Salminen, Reijo; Karlsnes, Andy

2008-09-22T23:59:59.000Z

50

Physical properties of kraft black liquor: Summary report, Phases 1 and 2  

SciTech Connect (OSTI)

Since 1981, a research program has been in progress to determine the physical properties of kraft black liquors and to develop methods for reduction of data and correlation of properties with pumping conditions. The basic premise that has been used to direct the research program is that kraft black liquor behaves as a polymer solution, particularly at high solids, and that the behavior is dominated by the characteristics of the lignin present. This premise is proving to be correct, and the principles that follow from this premise are proving to be successful for data reduction and correlation. The research has been a complex program involving experimental pulping, chemical analysis, lignin separation and characterization, thermal analysis, rheological measurements, and considerable equipment and methods development. Due to the complexity of the program, the unforeseen need to expend a great deal of effort in development of experimental techniques for analysis, and the fact that our liquors proved to be unstable at high temperatures and solids, all of the original objectives could not be accomplished. However, our program has added substantially to the body of knowledge of physical properties of black liquor. Our results indicate that the goal of developing correlations for physical properties of kraft black liquor is practical and can be realized through extension of the present work.

Fricke, A.L.

1987-09-01T23:59:59.000Z

51

Separation of kraft lignin from kraft black liquor: Final report, July 1984-April 1987  

SciTech Connect (OSTI)

All the objectives were accomplished: a high-quality kraft lignin containing less than 50 ppM sodium was separated into a solvent phase (freon) from as much as 1000 lb kraft black liquor. Supporting data (infrared spectra, chemical analyses, etc.) are included. (DLC)

Kurple, K.R.

1988-04-15T23:59:59.000Z

52

Fermentation and chemical treatment of pulp and paper mill sludge  

DOE Patents [OSTI]

A method of chemically treating partially de-ashed pulp and/or paper mill sludge to obtain products of value comprising taking a sample of primary sludge from a Kraft paper mill process, partially de-ashing the primary sludge by physical means, and further treating the primary sludge to obtain the products of value, including further treating the resulting sludge and using the resulting sludge as a substrate to produce cellulase in an efficient manner using the resulting sludge as the only carbon source and mixtures of inorganic salts as the primary nitrogen source, and including further treating the resulting sludge and using the resulting sludge to produce ethanol.

Lee, Yoon Y; Wang, Wei; Kang, Li

2014-12-02T23:59:59.000Z

53

Kraft black liquor delivery systems  

SciTech Connect (OSTI)

Improvement of spray nozzles for black liquor injection into kraft recovery furnaces is expected to result from obtaining a controlled, well-defined droplet size distribution. Work this year has centered on defining the capabilities of commercial black liquor nozzles currently in use. Considerations of the observed mechanism of droplet formation suggest a major revision is needed in the theory of how droplets form from these nozzles. High resolution, high sensitivity video has been shown to be superior to flash x-ray as a technique for measuring the droplet size distribution as well as the formation history. An environmentally sound spray facility capable of spraying black liquor at temperatures up to normal firing conditions is being constructed before data acquisition continues. Preliminary correlations have been developed between liquor properties, nozzle design, and droplet size. Three aspects of nozzle design have been investigated: droplet size distribution, fluid sheet thickness, and flow and pressure drop characteristics. The standard deviation about the median droplet size for black liquor is nearly the same as the for a wide variety of other fluids and nozzle types. Preliminary correlation for fluid sheet thickness on the plate of a splashplate nozzle show the strong similarities of black liquor to other fluids. The flow and pressure drop characteristic of black liquor nozzle, follow a simple two-term relationship similar to other flow devices. This means that in routine mill operation of black liquor nozzles only the fluid acceleration in the nozzle is important, viscous losses are quiet small. 21 refs., 53 figs., 10 tabs.

Adams, T.N.; Empie, H.L.; Obuskovic, N.; Spielbauer, T.M.

1990-02-01T23:59:59.000Z

54

A comprehensive program to develop correlations for the physical properties of Kraft black liquor. Interim report No. 3  

SciTech Connect (OSTI)

The black liquor properties program has been conducted over this last period so as to systematically collect data on properties, liquor composition, and lignin characteristics very carefully by methods that have developed during this program. Complete data has been collected for Slash Pine black liquors made by experimental pulping at different pulping conditions. In addition, data has been collected for mill liquors and partial properties or composition data has been collected on Slash Pine black liquors. Data reduction methods have been developed or extended for correlation of viscosity, heat capacity, heat of dilution, and density. Correlation of properties to pulping conditions and of composition to. pulping conditions has begun. In most cases, data reduction methods have been developed that are fundamentally based and that have been shown to be generally applicable to all black liquors. In the near future, we fully expect to accomplish our goal of developing generalized correlations relating physical properties of Slash Pine kraft black liquors to liquor composition. This interim report reviews the methods used, describes examples of data reduction methods that have been developed, and presents some preliminary results for correlation of liquor composition and properties to pulping conditions for Slash Pine black liquors.

Fricke, A.L.; Dong, D.J.; Schmidl, G.W.; Stoy, M.A.; Zaman, A.A.

1993-09-01T23:59:59.000Z

55

Sulfur dioxide and nitrogen oxides emissions from U.S. pulp and paper mills, 1980-2005  

SciTech Connect (OSTI)

Estimates of total SO{sub 2} and NOx emissions from U.S. pulp and paper mills were developed from industry-wide surveys conducted at 5-yr intervals from 1980 to 2005. The following conclusions were drawn from these estimates: (1) Total SO{sub 2} emissions from pulp and paper mills were 340,000 t in 2005. Since 1980, SO{sub 2} emissions have decreased steadily. The decline over the 25-yr period was over 60%. Paper production increased by 50% over the same period. (2) Boilers burning coal and oil are the primary source of SO{sub 2} emissions, with minor contributions from black liquor combustion in kraft recovery furnaces and the burning of noncondensable gases in boilers at kraft pulp mills. Factors contributing to the decline in boiler SO{sub 2} emissions include large reductions in residual oil use, recent decreases in coal use, declines in the average sulfur content of residual oil and coal being burned, and increasing use of flue gas desulfurization systems.(3) NOx emissions from pulp and paper mills were 230,000 t in 2005. NOx emissions were fairly constant through 1995, but then declined by 12% in 2000 and an additional 17% between 2000 and 2005. (4) In 2005, boilers accounted for two-thirds of the NOx emissions, and kraft mill sources approximately 30%. Boiler NOx emissions exhibited very little change through 1995, but decreased by one third in the next 10 yr. The lower emissions resulted from declines in fossil fuel use, a reduction in the EPA emission factors for natural gas combustion in boilers without NOx controls, and more widespread use of combustion modifications and add-on NOx control technologies, particularly on coal-fired boilers subject to EPA's NOx SIP call. Total NOx emissions from kraft mill sources changed little over the 25-yr period. 7 refs., 4 figs., 3 tabs.

John E. Pinkerton [National Council of the Paper Industry for Air and Stream Improvement Inc., Research Triangle Park, NC (United States). Air Quality Program

2007-08-15T23:59:59.000Z

56

Development of viscometers for kraft black liquor. Summary report, Phase 2 and 2A  

SciTech Connect (OSTI)

This report documents the results of the evaluation of the on-line prototype viscometers for kraft black liquors carried out at the Pilot Plant facilities of the University of Florida. The original plan called for the evaluation of five prototype on-line viscometers along with laboratory bench versions. At a later stage in the project an additional experimental prototype under development at Southwest Research Institute was added. The viscometers are evaluated for accuracy and repeatability under varying process conditions, such as black liquor species, solids content, temperature, flow rate, and contaminants, as well as for maintenance and reliability. This document reports extensive results of the evaluations and recommendations for design modifications and for the installation of the instruments in industrial pulping mills for further field evaluations in Phase 3 of the project. The report also documents relevant details of the final design of the pilot flow loop used to support the experiments.

Fricke, A.L.; Crisalle, O.D.

1996-11-01T23:59:59.000Z

57

Ultrafiltration of Kraft Black Liquor: Phase II, Final report  

SciTech Connect (OSTI)

The major justification for examining ultrafiltration was to lower the viscosity of the Kraft Black Liquor by recovering it as an ultrafiltration permeate from which the highest MW lignin had been removed. The liquor could then be concentrated to a higher percentage solids before firing into the recovery boiler. Consequent energy savings for the 1000 ton/day pulp mill would be 2.05 x 10 Btu/y for each percentage increase in TDS (total dissolved solids) to the recovery boiler. This Phase II report gives data on viscosity with percentage solids of KBL permeates. Another favorable effect of ultrafiltration on the permeate properties is disproportionate removal of multivalent ions including the major scaling ion CaS . If this high-viscosity high-Ca retentate could be treated to lower its viscosity and to release the Ca in a non-scaling form, this would enhance the possibility that ultrafiltration might be useful in a mill situation. Included in this report are data on the results of treating the retentate fraction. Other justifications for this program included further information in KBL properties: lignin MW in the KBL at high pH; elemental and sugar analyses; and differential properties of lignins in the retentate and the permeate fractions. A preliminary economic analysis of ultrafiltration is contained in this report. These analyses indicate that with flux rates now attainable, ultrafiltration would not be economically justified at this time if the only justification is to lower KBL viscosity. For certain situations where high Ca liquors present a scaling problem, especially in an evaporator-limited mill, the economics are more favorable. There are also unsolved problems relating to the use of the high viscosity retentate.

Hill, M.K.

1987-09-01T23:59:59.000Z

58

Sulfur-Free Selective Pulping  

E-Print Network [OSTI]

A joint research effort is being conducted on ways to produce cost-effective pulping catalysts from lignin. This project addresses improving selectivities and reducing the levels of sulfur chemicals used in pulping. Improved selectivity means...

Dimmel, D. R.; Bozell, J. J.

59

Mill Integration-Pulping, Stream Reforming and Direct Causticization for Black Liquor Recovery  

SciTech Connect (OSTI)

MTCI/StoneChem developed a steam reforming, fluidized bed gasification technology for biomass. DOE supported the demonstration of this technology for gasification of spent wood pulping liquor (or 'black liquor') at Georgia-Pacific's Big Island, Virginia mill. The present pre-commercial R&D project addressed the opportunities as well as identified negative aspects when the MTCI/StoneChem gasification technology is integrated in a pulp mill production facility. The opportunities arise because black liquor gasification produces sulfur (as H{sub 2}S) and sodium (as Na{sub 2}CO{sub 3}) in separate streams which may be used beneficially for improved pulp yield and properties. The negative aspect of kraft black liquor gasification is that the amount of Na{sub 2}CO{sub 3} which must be converted to NaOH (the so called causticizing requirement) is increased. This arises because sulfur is released as Na{sub 2}S during conventional kraft black liquor recovery, while during gasification the sodium associated Na{sub 2}S is partly or fully converted to Na{sub 2}CO{sub 3}. The causticizing requirement can be eliminated by including a TiO{sub 2} based cyclic process called direct causticization. In this process black liquor is gasified in the presence of (low sodium content) titanates which convert Na{sub 2}CO{sub 3} to (high sodium content) titanates. NaOH is formed when contacting the latter titanates with water, thereby eliminating the causticizing requirement entirely. The leached and low sodium titanates are returned to the gasification process. The project team comprised the University of Maine (UM), North Carolina State University (NCSU) and MTCI/ThermoChem. NCSU and MTCI are subcontractors to UM. The principal organization for the contract is UM. NCSU investigated the techno-economics of using advanced pulping techniques which fully utilize the unique cooking liquors produced by steam reforming of black liquor (Task 1). UM studied the kinetics and agglomeration problems of the conversion of Na{sub 2}CO{sub 3} to (high sodium) titanates during gasification of black liquor in the presence of (low sodium) titanates or TiO{sub 2} (Task 2). MTCI/ThermoChem tested the performance and operability of the combined technology of steam reforming and direct causticization in their Process Development Unit (PDU) (Task 3). The specific objectives were: (1) to investigate how split sulfidity and polysulfide (+ AQ) pulping can be used to increase pulp fiber yield and properties compared to conventional kraft pulping; (2) to determine the economics of black liquor gasification combined with these pulping technologies in comparison with conventional kraft pulping and black liquor recovery; (3) to determine the effect of operating conditions on the kinetics of the titanate-based direct causticization reaction during black liquor gasification at relatively low temperatures ({le} 750 C); (4) to determine the mechanism of particle agglomeration during gasification of black liquor in the presence of titanates at relatively low temperatures ({le} 750 C); and (5) to verify performance and operability of the combined technology of steam reforming and direct causticization of black liquor in a pilot scale fluidized bed test facility.

Adriaan van Heiningen

2007-06-30T23:59:59.000Z

60

HIGHLY ENERGY EFFICIENT D-GLU (DIRECTED-GREEN LIQ-UOR UTILIZATION) PULPING  

SciTech Connect (OSTI)

Purpose: The purpose of the project was to retrofit the front end (pulp house) of a commercial kraft pulping mill to accommodate a mill green liquor (GL) impregna-tion/soak/exposure and accrue downstream physical and chemical benefits while prin-cipally reducing the energy footprint of the mill. A major player in the mill contrib-uting to excessive energy costs is the lime kiln. The project was intended to offload the energy (oil or natural gas) demands of the kiln by by-passing the causticization/slaking site in the recovery area and directly using green liquor as a pulping medium for wood. Scope: The project was run in two distinct, yet mutually compatible, phases: Phase 1 was the pre-commercial or laboratory phase in which NC State University and the Insti-tute of Paper Science and Technology (at the Georgia Institute of Technology) ran the pulping and associated experiments, while Phase 2 was the mill scale trial. The first tri-al was run at the now defunct Evergreen Pulp Mill in Samoa, CA and lead to a partial retrofit of the mill that was not completed because it went bankrupt and the work was no longer the low-hanging fruit on the tree for the new management. The second trial was run at the MeadWestvaco Pulp Mill in Evedale, TX which for all intents and pur-poses was a success. They were able to fully retrofit the mill, ran the trial, studied the pulp properties, and gave us conclusions.

Lucia, Lucian A

2013-04-19T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Electrochemical mercerization, souring, and bleaching of textiles  

DOE Patents [OSTI]

Economical, pollution-free treatment of textiles occurs in a low voltage electrochemical cell that mercerizes (or scours), sours, and optionally bleaches without effluents and without the purchase of bulk caustic, neutralizing acids, or bleaches. The cell produces base in the cathodic chamber for mercerization and an equivalent amount of acid in the anodic chamber for neutralizing the fabric. Gas diffusion electrodes are used for one or both electrodes and may simultaneously generate hydrogen peroxide for bleaching. The preferred configuration is a stack of bipolar electrodes, in which one or both of the anode and cathode are gas diffusion electrodes, and where no hydrogen gas is evolved at the cathode.

Cooper, John F. (Oakland, CA)

1995-01-01T23:59:59.000Z

62

Improved Materials for Use as Components in Kraft Black Liquor Recovery Boilers  

SciTech Connect (OSTI)

This Cooperative Research and Development Agreement (CRADA) was undertaken to evaluate current and improved materials and materials processing conditions for use as components in kraft black liquor recovery boilers and other unit processes. The main areas addressed were: (1) Improved Black Liquor Nozzles, (2) Weld Overlay of Composite Floor Tubes, and (3) Materials for Lime Kilns. Iron aluminide was evaluated as an alternate material for the nozzles used to inject an aqueous solution known as black liquor into recovery boilers as well for the uncooled lining in the ports used for the nozzles. Although iron aluminide is known to have much better sulfidation resistance in gases than low alloy and stainless steels, it did not perform adequately in the environment where it came into contact with molten carbonate, sulfide and sulfate salts. Weld overlaying carbon steel tubes with a layer of stainless weld metal was a proposed method of extending the life of recovery boiler floor tubes that have experienced considerable fireside corrosion. After exposure under service conditions, sections of weld overlaid floor tubes were removed from a boiler floor and examined metallographically. Examination results indicated satisfactory performance of the tubes. Refractory-lined lime kilns are a critical component of the recovery process in kraft pulp mills, and the integrity of the lining is essential to the successful operation of the kiln. A modeling study was performed to determine the cause of, and possible solutions for, the repeated loss of the refractory lining from the cooled end of a particular kiln. The evaluation showed that the temperature, the brick shape and the coefficient of friction between the bricks were the most important parameters influencing the behavior of the refractory lining.

Keiser, J.R.

2001-10-22T23:59:59.000Z

63

Improved Materials for Use as Components in Kraft Black Liquor Recovery Boilers  

SciTech Connect (OSTI)

This Cooperative Research and Development Agreement (CRADA) was undertaken to evaluate current and improved materials and materials processing conditions for use as components in kraft black liquor recovery boilers and other unit processes. The main areas addressed were: (1) Improved Black Liquor Nozzles, (2) Weld Overlay of Composite Floor Tubes, and (3) Materials for Lime Kilns. Iron aluminide was evaluated as an alternate material for the nozzles used to inject an aqueous solution known as black liquor into recovery boilers as well for the uncooled lining in the ports used for the nozzles. Although iron aluminide is known to have much better sulfidation resistance in gases than low alloy and stainless steels, it did not perform adequately in the environment where it came into contact with molten carbonate, sulfide and sulfate salts. Weld overlaying carbon steel tubes with a layer of stainless weld metal was a proposed method of extending the life of recovery boiler floor tubes that have experienced considerable fireside corrosion. After exposure under service conditions, sections of weld overlaid floor tubes were removed from a boiler floor and examined metallographically. Examination results indicated satisfactory performance of the tubes. Refractory-lined lime kilns are a critical component of the recovery process in kraft pulp mills, and the integrity of the lining is essential to the successful operation of the kiln. A modeling study was performed to determine the cause of, and possible solutions for, the repeated loss of the refractory lining from the cooled end of a particular kiln. The evaluation showed that the temperature, the brick shape and the coefficient of friction between the bricks were the most important parameters influencing the behavior of the refractory lining.

Keiser, J.R.

2000-04-18T23:59:59.000Z

64

Kraft recovery boiler physical and chemical processes  

SciTech Connect (OSTI)

The focus of this book is on the recent research into the physical and chemical processes occurring in and around a black liquor recovery boiler. Almost all of the detailed technical information in this book has previously appeared in the open literature. The purpose here is not to present research for the first time, but to present it in a context of the other processes occurring in recovery boilers. Topics covered include: general characteristics of recovery boilers; black liquor thermal and transport properties; black liquor droplet formation and combustion; recovery boiler char bed processes; flow and mixing in Kraft recovery boilers; entrainment and carryover in recovery furnaces; fume formation and dust chemistry; deposits and boiler plugging; and recovery boiler thermal performance. 257 refs., 102 figs., 38 tabs.

Adams, T.N.; Frederick, W.J. (Adams (Terry N.), Tacoma, WA (USA); Oregon State Univ., Corvallis, OR (USA). Dept. of Chemical Engineering)

1988-01-01T23:59:59.000Z

65

Energy Analysis of a Kraft Pulp Mill: Potential for Energy Efficiency and Advanced Biomass Cogeneration  

E-Print Network [OSTI]

to be energy self-sufficent (with excess energy as a potentially important by-product for export) requires , Permanent address: Departmenl of Environmental and Energy Systems Studies, Lund University, Lund, Sweden. " To whom all correspondence should... identified significant savings potentials. For example, one mill in Sweden uses 13-14 MMBtu per ADST of steam and has a process (;onfiguration similar to the mill studied here (23). Despite the already low steam consumption at the Swedish mill, a pin...

Subbiah, A.; Nilsson, L. J.; Larson, E. D.

66

Selective enrichment of a methanol-utilizing consortium using pulp & paper mill waste streams  

SciTech Connect (OSTI)

Efficient utilization of carbon inputs is critical to the economic viability of the current forest products sector. Input carbon losses occur in various locations within a pulp mill, including losses as volatile organics and wastewater . Opportunities exist to capture this carbon in the form of value-added products such as biodegradable polymers. Waste activated sludge from a pulp mill wastewater facility was enriched for 80 days for a methanol-utilizing consortium with the goal of using this consortium to produce biopolymers from methanol-rich pulp mill waste streams. Five enrichment conditions were utilized: three high-methanol streams from the kraft mill foul condensate system, one methanol-amended stream from the mill wastewater plant, and one methanol-only enrichment. Enrichment reactors were operated aerobically in sequencing batch mode at neutral pH and 25°C with a hydraulic residence time and a solids retention time of four days. Non-enriched waste activated sludge did not consume methanol or reduce chemical oxygen demand. With enrichment, however, the chemical oxygen demand reduction over 24 hour feed/decant cycles ranged from 79 to 89 %, and methanol concentrations dropped below method detection limits. Neither the non-enriched waste activated sludge nor any of the enrichment cultures accumulated polyhydroxyalkanoates (PHAs) under conditions of nitrogen sufficiency. Similarly, the non-enriched waste activated sludge did not accumulate PHAs under nitrogen limited conditions. By contrast, enriched cultures accumulated PHAs to nearly 14% on a dry weight basis under nitrogen limited conditions. This indicates that selectively-enriched pulp mill waste activated sludge can serve as an inoculum for PHA production from methanol-rich pulp mill effluents.

Gregory R. Mockos; William A. Smith; Frank J. Loge; David N. Thompson

2007-04-01T23:59:59.000Z

67

A comprehensive program to develop correlations for the physical properties of Kraft black liquor. Interim report No. 2  

SciTech Connect (OSTI)

Experimental effort for the program to evaluate physical properties of kraft black liquors is now proceeding well. Experimental work includes pulping, liquor analysis, lignin purification and characterization, vapor-liquid equilibria, heat capacity, heats of solution and combustion, and viscosity measurements. Measurement of thermal conductivity has not yet begun. Collection of the data necessary for development of generalized correlations is proceeding, but will require about two more years. The digester is operating very well. It is now possible to operate the digester as a closed, rotating reactor or as a batch reactor with liquor circulation. When operated with liquor circulation, temperatures within the chip bed can be monitored during cooking. Cooking is reproducible, and cooks are being performed to produce liquors for experimental studies. The digester could be further modified to permit us to conduct rapid exchange batch pulping or to permit us to simulate continuous pulping. Liquors to be used in experimental studies are concentrated in our large scale evaporator or in our small scale evaporator. The large scale evaporator is used to concentrate liquors to about 50% solids for storage and for use in studies requiring high solids liquors. The small scale evaporator is used for preparing final samples to as high as 85% solids and for measuring vapor-liquid equilibria. Liquors are now routinely analyzed to determine all components, except higher molecular weight organic acids and extractives. Lignin determination by uv-visible means has been improved. Lignin purification from black liquor has been improved and lignin molecular weights are determined routinely. Work on lignin molecular weight distribution is still not satisfactory, but recent developments holds promise.

Fricke, A.L.

1990-12-01T23:59:59.000Z

68

Combined biomass and black liquor gasifier/gas turbine cogeneration at pulp and paper mills  

SciTech Connect (OSTI)

Kraft pulp and paper mills generate large quantities of black liquor and byproduct biomass suitable for gasification. These fuels are used today for onsite cogeneration of heat and power in boiler/steam turbine systems. Gasification technologies under development would enable these fuels to be used in gas turbines. This paper reports results of detailed full-load performance modeling of pulp-mill cogeneration systems based on gasifier/gas turbine technologies. Pressurized, oxygen-blown black liquor gasification, the most advanced of proposed commercial black liquor gasifier designs, is considered, together with three alternative biomass gasifier designs under commercial development (high-pressure air-blown, low-pressure air-blown, and low-pressure indirectly-heated). Heavy-duty industrial gas turbines of the 70-MW{sub e} and 25-MW {sub e} class are included in the analysis. Results indicate that gasification-based cogeneration with biomass-derived fuels would transform a typical pulp mill into significant power exporter and would also offer possibilities for net reductions in emissions of carbon dioxide relative to present practice.

Larson, E.D.; Kreutz, T.G. [Princeton Univ., NJ (United States). Center for Energy and Environmental Studies; Consonni, S. [Politecnico di Milano, Milan (Italy). Dipt. di Energetica

1999-07-01T23:59:59.000Z

69

Gas Dynamics of NGC 4472 R. P. Kraft(1)  

E-Print Network [OSTI]

Gas Dynamics of NGC 4472 R. P. Kraft(1) , W. R. Forman(1) , C. Jones(1) , P. E. J. Nulsen(1) M. J present preliminary results from a 100 ks XMM-Newton observation of the hot gas in the nearby massive to be falling into the Virgo cluster. We find several structures in the gas indicative of a previous epoch

Sarazin, Craig

70

Physical properties of kraft black liquor. Final report. Phase I  

SciTech Connect (OSTI)

Methods were selected, equipment installed, and procedures developed for determining rheological properties; for determining thermal properties (stability, density, thermal expansion, and heat capacity); for purification and characterization of lignin (glass transition, stability, weight average molecular weight, and number average molecular weight); and for performing chemical analyses (negative inorganic ions, positive inorganic ions, acid organic salts, lignin, and total solids). A strategy for pulping to supply test liquors was developed, and a statistically designed pulping experiment was specified for a Southern softwood species. Arrangements were made for performing initial pulping work in an industrial pilot plant, and a preliminary set of pulping experiments were conducted. Liquors from the preliminary pulping experiments were used to test procedures and to determine reproducibility of the experiment. Literature was also surveyed and preliminary selection of designs for a pilot digester, and for equipment to determine surface tension were made.

Fricke, A.L.

1983-12-01T23:59:59.000Z

71

Advanced Oxidation Technology for Pulp Mill Effluent  

E-Print Network [OSTI]

ADVANCED OXIDATION TECHNOLOGY FOR PULP MILL EFFLUENT J. ROBERT HART, MANAGER, EPRI PULP & PAPER OFFICE, ATLANTA, GA ABSTRACT The composition of effluent from various pulping processes can exhibit a wide range of physical and chemical... in Integrated Pulp and Paper Mill Effluents", 1992 169 ESL-IE-92-04-30 Proceedings from the 14th National Industrial Energy Technology Conference, Houston, TX, April 22-23, 1992 ...

Hart, J. R.

72

affect bleaching efficiency: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

unfriendly bleaching agents (perborates and percarbonates), which cause aquatic eutrophication, although without these compounds detergents are much less efficient for the...

73

E-Print Network 3.0 - activated bleaching earth Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

bleaching earth Search Powered by Explorit Topic List Advanced Search Sample search results for: activated bleaching earth Page: << < 1 2 3 4 5 > >> 1 Mass Coral Reef Bleaching: A...

74

Materials for the pulp and paper industry. Section 1: Development of materials for black liquor recovery boilers  

SciTech Connect (OSTI)

Black liquor recovery boilers are essential components of kraft pulp and paper mills because they are a critical element of the system used to recover the pulping chemicals required in the kraft pulping process. In addition, the steam produced in these boilers is used to generate a significant portion of the electrical power used in the mill. Recovery boilers require the largest capital investment of any individual component of a paper mill, and these boilers are a major source of material problems in a mill. The walls and floors of these boilers are constructed of tube panels that circulate high pressure water. Molten salts (smelt) accumulate on the floor of recovery boilers, and leakage of water into the boiler can result in a violent explosion when the leaked water instantly vaporizes upon contacting the molten smelt. Because corrosion of the conventionally-used carbon steel tubing was found to be excessive in the lower section of recovery boilers, use of stainless steel/carbon steel co-extruded tubing was adopted for boiler walls to lessen corrosion and reduce the likelihood of smelt/water explosions. Eventually, this co-extruded or composite (as it is known in the industry) tubing was selected for use as a portion or all of the floor of recovery boilers, particularly those operating at pressures > 6.2 MPa (900 psi), because of the corrosion problems encountered in carbon steel floor tubes. Since neither the cause of the cracking nor an effective solution has been identified, this program was established to develop a thorough understanding of the degradation that occurs in the composite tubing used for walls and floors. This is being accomplished through a program that includes collection and review of technical reports, examination of unexposed and cracked tubes from boiler floors, computer modeling to predict residual stresses under operating conditions, and operation of laboratory tests to study corrosion, stress corrosion cracking, and thermal fatigue.

Keiser, J.R.; Hubbard, C.R.; Payzant, E.A. [Oak Ridge National Lab., TN (United States)] [and others

1997-04-01T23:59:59.000Z

75

Diese nderung tritt nach der Genehmigung durch den Rektor am 1. Okober 2009 in Kraft. Sie wird im  

E-Print Network [OSTI]

Artikel 2 Diese Ă?nderung tritt nach der Genehmigung durch den Rektor am 1. Okober 2009 in Kraft: ,,Bachelorarbeit". Artikel 2 Diese Ă?nderung tritt nach der Genehmigung durch den Rektor am 1. Oktober 2009 in Kraft

Hoffmeister, Thomas S.

76

Review: Business and Environmental Policy: Corporate Interests in the American Political System, by Michael E. Kraft and Sheldon Kamieniecki (eds.)  

E-Print Network [OSTI]

Martijn Meij Stillwater, Oklahoma, USA Kraft, Michael E. andCandidate in Sociology, Oklahoma State University, Classroom

Meij, Jan-Martin

2008-01-01T23:59:59.000Z

77

A Non-linear Dynamical Systems' Proof of Kraft-McMillan Inequality and its Converse  

E-Print Network [OSTI]

In this short paper, we shall provide a dynamical systems' proof of the famous Kraft-McMillan inequality and its converse. Kraft-McMillan inequality is a basic result in information theory which gives a necessary and sufficient condition for the lengths of the codewords of a code to be uniquely decodable.

Nithin Nagaraj

2007-10-31T23:59:59.000Z

78

Ultrafiltration of Kraft Black Liquor. Final report, Phase I  

SciTech Connect (OSTI)

Kraft Black Liquor (KBL) is ultrafiltered to favorably affect the properties of the KBL permeate. The major property to be changed is viscosity. If the high molecular weight lignin is removed by ultrafiltration, the KBL permeate should show a significant drop in viscosity. An objective of the work reported was to examine how much KBL viscosity is lowered relative to membrane and membrane pore size used in the ultrafiltration. Another objective was an initial evaluation of ultrafiltration equipment and membranes. Operating characteristics were determined for selected equipment and membranes. Decreases in KBL permeate viscosity were indeed seen. (LEW)

Hill, M.K.

1985-10-01T23:59:59.000Z

79

Synergistic air port corrosion in kraft recovery boilers  

SciTech Connect (OSTI)

Localized hot corrosion can occur on the cold-side of air-ports in Kraft recovery boilers. Depending on the basicity of the molten salt, either acidic or basic fluxing takes place, with a solubility minima at the transition between the two reactions. For stainless steel, if the basicity of the fused salt is between the iron and chromium oxide solubility minima, then a synergistic effect can occur that leads to rapid corrosion. The products of one reaction are the reactants of the other, which eliminates the need for rate-controlling diffusion. This effect can explain why stainless steel is attacked more readily than carbon steel.

Holcomb, Gordon R.

2001-08-01T23:59:59.000Z

80

Steam System Opportunity Assessment for the Pulp and Paper, Chemical...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

System Opportunity Assessment for the Pulp and Paper, Chemical Manufacturing, and Petroleum Refining Industries Steam System Opportunity Assessment for the Pulp and Paper,...

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

We report here the auxetic (negative Poisson's ratio) response of cellulose based fiber networks. Auxetic materials grow fatter when stretched and are extremely rare  

E-Print Network [OSTI]

) Grammage (g/m2) Source Copy Paper 105±2 75 Office Max OM98043 Copy Paper 30% recycled fibers, 92 brightness, 20 lb. wt. Paperboard 270±2 220 Smead UPC 12043 No. 53LBE 10% recycled fibers, Colored blue folder Handsheet HW 586±28 110 Kraft pulp hardwood, bleached PET Film 144±2 152 HP Premium Inkjet Transparency Film

Das, Suman

82

Pulp & Paper Industry- A Strategic Energy Review  

E-Print Network [OSTI]

The pulp and paper industry with yearly energy purchases of $5 billion per year including 50 billion kWh of power is one of the largest industrial energy producers in the U.S. However, structural changes in the global pulp and paper industry could...

Stapley, C. E.

83

Effect of pulping conditions and black liquor composition on Newtonian viscosity of high solids kraft black liquors  

SciTech Connect (OSTI)

The influence of black liquor composition and solids concentrations on the Newtonian viscosity of slash pine black liquors over wide ranges of temperature (up to 140 C) and solids concentrations (between 50% and 83% solids) has been studied. It was found that the zero shear rate viscosity of high solids black liquors depends strongly on the cooking conditions and/or black liquor composition. Not only is high solids viscosity affected by lignin molecular weight and lignin concentration in the liquor but other organic and inorganic constituents of black liquor also make a significant contribution to viscosity. The dependency of zero shear rate viscosity on solids concentrations, and temperature is defined. The Newtonian viscosities vary over a wide range depending on temperature, solids concentrations and solids composition. The results indicate that, at fixed levels of effective alkali and sulfidity, the zero shear rate viscosities can be described as a function of both lignin concentration and lignin molecular weight. The viscosity of black liquor is an increasing function of the organics-to-inorganics ratio and is a decreasing function of the concentration of sodium and chloride ions and pH of the liquor.

Zaman, A.A.; Fricke, A.L. [Univ. of Florida, Gainesville, FL (United States). Dept. of Chemical Engineering] [Univ. of Florida, Gainesville, FL (United States). Dept. of Chemical Engineering

1996-02-01T23:59:59.000Z

84

Fundamental Investigations of C1O2 Delignification - Final Report - 07/10/1996 - 07/09/1999  

SciTech Connect (OSTI)

The overall objective of this project was to develop a fundamental understanding of the mechanisms of chlorine dioxide delignification of low kappa kraft pulps and identify new methods of improving the efficiency and effectiveness of this bleaching agent. The approach adopted was to investigate the fundamental structural components of lignin that contribute to delignification reactions with chlorine dioxide. These results were then used to examine new bleaching technologies that will permit enhanced delignification while simultaneously reducing the generation of chlorinated organic compounds.

Ragauskas, Arthur J.; McDonough, T. J.

2001-05-18T23:59:59.000Z

85

Freeze crystallization technology for Kraft black liquor concentration. Third report  

SciTech Connect (OSTI)

About 25% of the purchased energy in the pulp and paper industry is used to concentrate black liquor. The technical feasibility of using freeze concentration to supplement evaporation has been successfully demonstrated, and results indicate that energy consumption can be reduced 45%. After compiling a considerable data base on the characteristics of black liquor at low temperature and after developing a computer program to aid analysis, the process chosen was vacuum freezing-vapor absorption (VFVA). A pilot plant was built and operated; however, due to problems with crystallization of the absorbent and contamination, it was found that maintaining the conditions necessary for a continuous process was not practical at the present state of development. Therefore, indirect freezing was used for all subsequent work. This required the design and fabrication of a simple shuttle crystallizer to replace scraped surface units conventionally used. CSI also developed an integrated ice separation column that combined crystal growth, a concentration gradient, and washing all in one unit. Finally, extensive heat transfer coefficient data were collected so that a preliminary design could be completed for a 350 TPD industrial freeze concentration unit. An economic analysis was calculated in order to compare using evaporation and freeze concentration to process the increased liquor flow from a pulp mill expansion. A 200,000 lb/hr freezing unit used to preconcentrate the mill's entire stream up to 18.7% solids would save $10 to $16 per ton of pulp.

Johnson, W.E.; Rhodes, C.R.

1985-04-01T23:59:59.000Z

86

Pulp and paper program fact sheets  

SciTech Connect (OSTI)

Summaries are presented of Argonne technology transfer research projects in: sustainable forest management, environmental performance, energy performance, improved capital effectiveness, recycling, and sensors and controls. Applications in paper/pulp industry, other industries, etc. are covered.

NONE

1995-07-01T23:59:59.000Z

87

BIOLOGICAL ENGINEERING Program of Study  

E-Print Network [OSTI]

reaction engineering in wood pulping and pulp bleaching, char bed modeling, black liquor gasification

Thomas, Andrew

88

Recaustization of kraft black liquor via bipolar electrodialysis  

SciTech Connect (OSTI)

The US Department of Energy in conjunction with HPD Inc. supported a research program to perform a laboratory feasibility study with various black liquor samples for the recaustization of these samples via bipolar electrodialysis. The research was conducted at the HPD pilot plant facility in Plainfield, Illinois, beginning in April 1989. This report is a summary of the work completed thru November 1989. The program was designed to operate the electrodialyzer in order to obtain performance and engineering data such as current efficiency, power consumption per gram of NaOH produced, and assess fouling and/or membrane durability. Prior to the electrodialysis laboratory runs, the black liquor samples were pretreated in order to remove as much lignin as possible. The black liquor samples were air oxidized, acidified to pH = 9.0 and pH = 2.0 and later filtered via a Buchner funnel under vacuum. The filtrate was then utilized to become the feed to the electrodialysis stack. Initial test runs were performed with synthetic solutions of either sodium sulfate or sodium bicarbonate in order to determine acceptable operating current, power, current efficiencies, and fouling behavior. A second set of test were conducted with a series of four Southern Kraft black liquor samples. Based on the results of this study, it was determined that the use of bipolar electrodialysis for producing a caustic stream and an acidified black liquor stream is feasible and was demonstrated. 9 refs., 27 figs., 32 tabs.

Koumoundouros, J.A.; Oshen, S.; Lynch, J.D.

1990-05-01T23:59:59.000Z

89

Hot Corrosion at Air-Ports in Kraft Recovery Boilers  

SciTech Connect (OSTI)

Hot corrosion can occur on the cold-side of airports in Kraft recovery boilers. The primary corrosion mechanism involves the migration of sodium hydroxide and potassium hydroxide vapors through leaks in the furnace wall at the airports and their subsequent condensation. It has been reported that stainless steel is attacked much faster than carbon steel in composite tubes, and that carbon steel tubing, when used with a low-chromium refractory, does not exhibit this type of corrosion. For hot corrosion fluxing of metal oxides, either acidic or basic fluxing takes place, with a solubility minimum at the basicity of transition between the two reactions. For stainless steel, if the basicity of the fused salt is between the iron and chromium oxide solubility minima, then a synergistic effect can occur that leads to rapid corrosion. The products of one reaction are the reactants of the other, which eliminates the need for rate-controlling diffusion. This effect can explain why stainless steel is attacked more readily than carbon steel.

Holcomb, Gordon R.; Covino, Bernard S., Jr.; Russell, James H.

2003-01-01T23:59:59.000Z

90

New industrial heat pump applications to an integrated thermomechanical pulp and paper mill  

SciTech Connect (OSTI)

Application of pinch technology US industries in an early screening study done by TENSA Services (DOE/ID/12583-1) identified potential for heat pumps in several industrial sectors. Among these, processes with large evaporation units were found to be some of the most promising sectors for advanced heat pump placement. This report summarizes the results of a study for Bowater Incorporated, Carolina Division. The units selected for this study are the thermo-mechanical pulper (TMP), kraft digester, evaporators, boiler feed water (BFW) train and pulp dryer. Based on the present level of operation, the following recommendations are made: 1. Install a mechanical vapor compression (MVR) heat pump between the TMP mill and {number sign}3 evaporator. This heat pump will compress the 22 psig steam from the TMP heat recovery system and use it to replace about 70% of the 60 psig steam required in {number sign} evaporator. The boiler feed water heat losses (in the low pressure deaerator) will be supplied by heat available in the TMR's zero psig vent steam. 2. Study the digester to verify the practicality of installing an MVR heat pump which will compress the dirty weapons from the cyclone separator. The compressed vapors can be directly injected into the digester and thus reduce the 135 psig steam consumption. 31 figs., 9 tabs.

none,

1991-01-01T23:59:59.000Z

91

The Adaptive Bleaching Hypothesis: Experimental Tests of Critical Assumptions  

E-Print Network [OSTI]

to elevated tem- perature, (2) bleached adult hosts can acquire algal symbi- onts with an apparently dose of environmental factors including low (Goreau, 1964) and high (Nakano et al., 1997) salinity, low and high levels of illumination--especially ultraviolet radiation (Ban- aszak and Trench, 1995; Lesser and Shick, 1989), disease

Buffalo, State University of New York

92

Development of an alternative kraft black liquor recovery process based on low-temperature processing in fluidized beds. Final technical report on Annex 9, Task 1  

SciTech Connect (OSTI)

The overall objective of this research program was to provide the fundamental knowledge and experimental data from pilot scale operation for an alternative black liquor recovery technology which would have a higher overall energy efficiency, would not suffer from the smelt-water explosion hazard and would be lower in capital cost. In addition, the alternative process would be more flexible and well suited for incremental recovery capacity or for new pulping processes, such as the new sulfide-sulfide-AQ process. The research program consists of number of specific research objectives with the aim to achieve the ultimate objective of developing an alternative recovery process which is shown in Figure 1. The specific objectives are linked to individual unit operations and they represent the following research topics: (1) superheated steam drying of kraft black liquors; (2) fast pyrolysis of black liquor; (3) hydrogen sulfide absorption from flue gas; (4) reduction of sodium sulfate in solid phase with gaseous hydrogen; and (5) verification of the fundamental results in fluidized bed pilot plant. The accomplishments in each of these objectives are described.

Kubes, G.J.

1994-03-24T23:59:59.000Z

93

CSC310 Information Theory Sam Roweis Proving the Kraft-McMillan Inequalities  

E-Print Network [OSTI]

CSC310 ­ Information Theory Sam Roweis Lecture 3: Proving the Kraft-McMillan Inequalities September) Modeling. We have to represent the stochastic behaviour of the source and the channel using probabilistic. Review: Mathematical Setup 3 · A stochastic source emits a sequence of symbols (from alphabet A) X = X1

Roweis, Sam

94

PROPERTIES OF HDPE/CLAY/WOOD NANOCOMPOSITES , C. M. Clemons 2  

E-Print Network [OSTI]

from wood, kenaf, flax, hemp, cotton, Kraft pulp, coconut husk, areca fruit, pineapple leaf, oil palm

95

E-Print Network 3.0 - acid affect bleaching Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biology and Medicine 29 Climate change impedes scleractinian corals as primary reef ecosystem engineers Summary: and zooxanthellae. Bleaching is associated with a pronounced loss...

96

Die nderung tritt nach der Genehmigung des Rek-tors mit Wirkung vom 1. Oktober 2007 in Kraft.  

E-Print Network [OSTI]

Artikel 2 Die Ă?nderung tritt nach der Genehmigung des Rek- tors mit Wirkung vom 1. Oktober 2007 Ă?nderung tritt nach der Genehmigung des Rek- tors mit Wirkung vom 1. Oktober 2007 in Kraft. Bremen, den 10

Hoffmeister, Thomas S.

97

Gas Turbine Considerations in the Pulp and Paper Industry  

E-Print Network [OSTI]

GAS TURBINE CONSIDERATIONS IN THlI: PULP AND PAPER INDUSTRY J. Steven Anderson, Ph.D. Director-Energy International Paper Company Purchase, NY INTRODUCTION The pulp and paper industry is one of the largest users of energy... for the coming century. The industry has also become aware that gas turbine-based cogeneration systems can frequently be highly desirable relative to their tra ditional steam turbine approach. BACKGROUND The pulp and paper industry ranks as the fourth...

Anderson, J. S.; Kovacik, J. M.

98

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

54 3.5.1. Black Liquor2006. "Ultrafiltration of black liquor using rotating diskultrafiltration of Kraft black liquor using rotating disk

Kong, Lingbo

2014-01-01T23:59:59.000Z

99

Ocean acidification causes bleaching and productivity loss in coral reef builders  

E-Print Network [OSTI]

will show delayed and mixed responses. climate change global warming carbon dioxide Great Barrier ReefOcean acidification causes bleaching and productivity loss in coral reef builders K. R. N. Anthony1 with warming. Here, we report on an 8-week study that compared bleaching, productivity, and calcification

100

Pulp and Paper Corrosion Symposium Georgia Tech Renewable Bioproducts Institute  

E-Print Network [OSTI]

1 Pulp and Paper Corrosion Symposium Georgia Tech Renewable Bioproducts Institute November 2014 Digester Corrosion Margaret Gorog Federal Way, WA 2 · Chips plus a mixture of white and black liquor · The pulp is then blown from the bottom of the vessel into a blow tank · Corrosion occurs during filling

Das, Suman

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Southern Pine Based on Biorefinery Center  

SciTech Connect (OSTI)

This program seeks to develop an integrated southern pine wood to biofuels/biomaterials processing facility on the Recipient’s campus, that will test advanced integrated wood processing technologies at the laboratory scale, including: • The generation of the bioethanol from pines residues and hemicelluloses extracted from pine woodchips; • The conversion of extracted woodchips to linerboard and bleach grade pulps; and • The efficient conversion of pine residues, bark and kraft cooking liquor into a useful pyrolysis oil.

Ragauskas, Arthur J; Singh, Preet

2014-01-10T23:59:59.000Z

102

Recycling of cleach plant filtrates by electrodialysis removal of inorganic non-process elements.  

SciTech Connect (OSTI)

Water use in the pulp and paper industry is very significant, and the U.S. pulp and paper industries as well as other processing industries are actively pursuing water conservation and pollution prevention by in-process recycling of water. Bleach plant effluent is a large portion of the water discharged from a typical bleached kraft pulp mill. The recycling of bleach plant effluents to the kraft recovery cycle is widely regarded as an approach to low effluent bleached kraft pulp production. The focus of this work has been on developing an electrodialysis process for recycling the acidic bleach plant effluent of bleached Kraft pulp mills. Electrodialysis is uniquely suited as a selective kidney to remove non-process elements (NPEs) from bleach plant effluent before they reach the chemical recovery cycle. Using electrodialysis for selective NPE removal can prevent the problems caused by accumulation of inorganic NPEs in the pulping cycle and recovery boiler. In this work, acidic bleach plant filtrates from three mills using different bleaching sequences based on chlorine dioxide were characterized. The analyses showed no fundamental differences in the inorganic NPE composition or other characteristics among these filtrates. The majority of total dissolved solids in the effluents were found to be inorganic NPEs. Chloride and nitrate were present at significant levels in all effluent samples. Sodium was the predominant metal ion, while calcium and magnesium were also present at considerable levels. The feasibility of using electrodialysis to selectively remove inorganic NPEs from the acidic bleach effluent was successfully demonstrated in laboratory experiments with effluents from all these three mills. Although there were some variations in these effluents, chloride and potentially harmful cations, such as potassium, calcium, and magnesium, were removed efficiently from the bleach effluents into a small-volume, concentrated purge stream. This effective removal of inorganic NPEs can enable the mills to recycle bleach effluents to reduce water consumption. The electrodialysis process also effectively retained up to 98% of the organics and can reduce the organic discharge in the mill wastewater. By using suitable commercially available electrodialysis membranes, there were no indications of rapid or irreversible membrane fouling or scale formation, even in extended laboratory scale operations up to 100 hours. Results of laboratory experiments also showed that commercially available membranes properly selected for this process would have good stability to withstand the potentially oxidative conditions of the filtrate. A pilot-scale field demonstration was also conducted at a southern mill, using the D0 filtrate from the bleach plant. During the field demonstration we found serious membrane 2 stack clogging problems, which apparently were caused by fine fibers that escaped through the 5-micron pre-filters, although such a pre-filtration method had been satisfactory in the laboratory tests. Additional R&D is recommended to address this pre-filtration or clogging issue with systems approaches integrating pre-filtration, other separation methods, and stack design. After the pre-filtration/clogging issue is overcome, laboratory development and pilot demonstration are recommended to optimize the process parameters and to evaluate the long-term process parameters. The key technical issues here include membrane lives, control and mitigation of fouling and scaling, and cleaning-in-place protocols. From the data collected in this work, a preliminary process design and economic evaluations were performed for a model mill with 1,000-ton/day pulp production that uses a bleaching sequence based on chlorine dioxide. Assuming 3 m{sup 3} acidic effluents to be treated per ton of pulp produced, the electrodialysis process would require a membrane area of about 361 m{sup 2} for this model mill. The energy consumption of the electrodialytic stack for separation is estimated to be about $160/day, and the estimated capital cost of the electrodia

Tsai, S. P.; Pfromm, P.; Henry, M. P.; Fracaro, A. T.; Swanstrom, C. P.; Moon, P.; Energy Systems; Inst. of Paper Science and Tech.

2000-11-01T23:59:59.000Z

103

High Selectivity Oxygen Delignification  

SciTech Connect (OSTI)

The overall objective of this program was to develop improved extended oxygen delignification (EOD) technologies for current U.S. pulp mill operations. This was accomplished by: (1) Identifying pulping conditions that optimize O and OO performance; (2) Identifying structural features of lignin that enhance reactivity towards EOD of high kappa pulps; (3) Identifying factors minimizing carbohydrate degradation and improve pulp strength of EOD high kappa pulps; (4) Developing a simple, reproducible method of quantifying yield gains from EOD; and (5) Developing process conditions that significantly reduce the capital requirements of EOD while optimizing the yield benefits. Key research outcomes included, demonstrating the use of a mini-O sequence such as (E+O)Dkf:0.05(E+O) or Dkf:0.05(E+O)(E+O) without interstage washing could capture approximately 60% of the delignification efficiency of a conventional O-stage without the major capital requirements associated with an O-stage for conventional SW kraft pulps. The rate of formation and loss of fiber charge during an O-stage stage can be employed to maximize net fiber charge. Optimal fiber charge development and delignification are two independent parameters and do not parallel each other. It is possible to utilize an O-stage to enhance overall cellulosic fiber charge of low and high kappa SW kraft pulps which is beneficial for physical strength properties. The application of NIR and multi-variant analysis was developed into a rapid and simple method of determining the yield of pulp from an oxygen delignification stage that has real-world mill applications. A focus point of this program was the demonstration that Kraft pulping conditions and oxygen delignification of high and low-kappa SW and HW pulps are intimately related. Improved physical pulp properties and yield can be delivered by controlling the H-factor and active alkali charge. Low AA softwood kraft pulp with a kappa number 30 has an average improvement of 2% in yield and 4 cP in viscosity in comparison to high AA pulp for the oxygen delignification. This difference is also seen for high-kappa SW kraft pulps with an average improvement of {approx}3% in yield and 3 cP in viscosity for low AA high kappa number 50 pulp. Low AA hardwood kappa number 20 pulp had an average improvement of {approx}4% in yield and 6-12 cP in viscosity as compared to high AA pulp. Lower kraft cooking temperature (160 vs. 170 C) in combination with the medium AA provides a practical approach for integrating high kappa pulping of hardwoods (i.e., low rejects) with an advanced extended oxygen delignification stage. ECF pulp bleaching of low and high kappa kraft SW and HW pulps exhibit comparable optical and physical strength properties when bleached D(EPO)D.

Arthur J. Ragauskas

2005-09-30T23:59:59.000Z

104

A comprehensive program to develop correlations for the physical properties of kraft black liquors  

SciTech Connect (OSTI)

Experimental work includes pulping, liquor analysis, lignin purification and characterization, vapor-liquid equilibria, heat capacity, heats of solution and combustion, and viscosity measurements. It is now possible to operate the digester as a closed, rotating reactor or as a batch reactor with liquor circulation. When operated with liquor circulation, temperatures within the chip bed can be monitored during cooking. Cooking is reproducible, and cooks are being performed to produce liquors for experimental studies. The digester could be further modified to permit them to conduct rapid exchange batch pulping or to permit them to simulate continuous pulping. Liquors are now routinely analyzed to determine all components, except higher molecular weight organic acids and extractives. Lignin determination by UV-visible means has been improved. Lignin purification from black liquor has been improved and lignin molecular weights are determined routinely. The paper describes the digestor, the large scale evaporation, liquor analysis, thermal studies, and viscosity results. 31 figs., 5 tabs.

Fricke, A.L.

1990-12-01T23:59:59.000Z

105

Eucalyptus kraft black liquor enhances growth and productivity of Spirulina in outdoor cultures  

SciTech Connect (OSTI)

Mass cultivation of microalgae for commercial applications suffers from poor productivities when measured against laboratory results or theoretical projections. In an effort to reduce this gap it was discovered that addition of eucalyptus kraft black liquor (BL) enhanced biomass productivity in outdoor cultures of Spirulina by increasing growth rate by 38% and biomass yield by 43%. BL treatment resulted in elevation of nitrogen assimilating enzyme activities and efficiency of phosphate utilization. Analyses of forenoon and afternoon oxygen production rates (OPRs) indicated higher photosynthetic and respiratory activity in BL-treated cultures compared to untreated cultures. 20 refs., 1 fig., 2 tabs.

Chauhan, V.S.; Singh, G.; Ramamurthy, V. [Thapar Institute of Engineering and Technology, Patiala (India)

1995-07-01T23:59:59.000Z

106

Energy Management and Computers in the Pulp and Paper Industry  

E-Print Network [OSTI]

dryer hood waste heat. o Biomass feedstocks for the production of specialized chemial products. o Crossing of the stone groundwood process with the thermomechanical pulping process. 236 ESL-IE-81-04-42 Proceedings from the Third Industrial Energy...

Sommerfeld, J. T.; Hartley, E. M.

1981-01-01T23:59:59.000Z

107

PuLP: A Linear Programming Toolkit for Python  

E-Print Network [OSTI]

Sep 5, 2011 ... PuLP is a high-level modelling library that leverages the power of the ..... ness between any two people is a function of the number of letters ...

2011-09-05T23:59:59.000Z

108

Magnet options for sensors for the pulp and paper industry  

E-Print Network [OSTI]

measuring the moisture content of wood chips. pulp or blackmeasurements of the moisture content in wood chips and blackwood species in the incoming chip stream, 3) a measurement of the moisture content

Green, M.A.

2011-01-01T23:59:59.000Z

109

Electrochemical treatment of black liquor from straw pulping  

SciTech Connect (OSTI)

The conventional black liquor regeneration process is not always suitable for pulping plants of nonwood fibers due to the unfavorable ratio of organic to inorganic solids. This paper presents an alternative treatment based on an electrolysis process of the soda black liquor from straw pulping. This alternative method minimizes the environmental impact by recovering the caustic at the same time that the liquor is acidified, which favors the later separation of the lignin.

Blanco, M.A.; Negro, C.; Tijero, J. [Complutense Univ., Madrid (Spain)] [and others

1996-11-01T23:59:59.000Z

110

A comprehensive program to develop correlations for physical properties of kraft black liquor. Final report  

SciTech Connect (OSTI)

A wide variety of experimental techniques have been used in this work, and many of these have been developed completely or improved significantly in the course of the research done during this program. Therefore, it is appropriate to describe these techniques in detail as a reference for future workers so that the techniques can be used in future work with little additional effort or so that the results reported from this program can be compared better with future results from other work. In many cases, the techniques described are for specific analytical instruments. It is recognized that these may be superseded by future developments and improvements in instrumentation if a complete description of techniques used successfully in the past on other instrumentation is available. The total pulping and liquor preparation research work performed included chip and white liquor preparation, digestion, pulp washing, liquor and wash recovery, liquor sampling, weak liquor concentration in two steps to about 45--50% solids with an intermediate soap skimming at about 140F and 27--30% solids, determination of pulp yield and Kappa number, determination of total liquor solids, and a check on the total material balance for pulping. All other research was performed either on a sample of the weak black liquor (the combined black liquor and washes from the digester) or on the skimmed liquor that had been concentrated.

Fricke, A.L.; Zaman, A.A.; Stoy, M.O.; Schmidl, G.W.; Dong, D.J.; Speck, B.

1998-04-01T23:59:59.000Z

111

Diese nderung tritt nach der Genehmigung durch den Rektor mit Wirkung vom 1. Oktober 2008 in Kraft.  

E-Print Network [OSTI]

Artikel 2 Diese Ă?nderung tritt nach der Genehmigung durch den Rektor mit Wirkung vom 1. Oktober Name des zweiten Gruppenmit- glieds zu nennen." Artikel 2 Diese Ă?nderung tritt nach der Genehmigung tritt nach der Genehmigung durch den Rektor am 1. Oktober 2009 in Kraft. Sie wird im Amtsblatt der

Hoffmeister, Thomas S.

112

Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata  

E-Print Network [OSTI]

of bleaching and endolithic algae blooms in the skeleton ofa lesser extent, endolithic algae within the coral skeleton.Endolithic algae produce distinctive green bands in the

Hartmann, A. C.; Carilli, J. E.; Norris, R. D.; Charles, C. D.; Deheyn, D. D.

2010-01-01T23:59:59.000Z

113

Reduced bleaching in organic nanofibers by bilayer polymer/oxide coating  

SciTech Connect (OSTI)

Para-hexaphenylene (p-6P) molecules exhibit a characteristic photoinduced reaction (bleaching) resulting in a decrease in luminescence intensity upon UV light exposure, which could render the technological use of the nanofibers problematic. In order to investigate the photoinduced reaction in nanofibers, optical bleaching experiments have been performed by irradiating both pristine and coated nanofibers with UV light. Oxide coating materials (SiO{sub x} and Al{sub 2}O{sub 3}) were applied onto p-6P nanofibers. These treatments caused a reduction in the bleaching reaction but in addition, the nanofiber luminescence spectrum was significantly altered. It was observed that some polymer coatings [a statistical copolymer of tetrafluoroethylene and 2,2-bis-trifluoromethyl-4,5-difluoro-1,3-dioxole, P(TFE-PDD), and poly(methyl methacrylate), PMMA] do not interfere with the luminescence spectrum from the p-6P but are not effective in stopping the bleaching. Bilayer coatings with first a polymer material, which should work as a protection layer to avoid modifications of the p-6P luminescence spectrum, and second an oxide layer used as oxygen blocker were tested and it was found that a particular bilayer polymer/oxide combination results in a significant reduction in bleaching without affecting significantly the emission spectrum from the nanofibers.

Tavares, L.; Kjelstrup-Hansen, J.; Rubahn, H.-G. [NanoSyd, Mads Clausen Institute, University of Southern Denmark, Alsion 2, DK-6400 Soenderborg (Denmark); Sturm, H. [Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin (Germany)

2010-05-15T23:59:59.000Z

114

Ultrasonic Sensor to Characterize Wood Pulp During Refining  

SciTech Connect (OSTI)

A novel sensor concept has been developed for measuring the consistency, the degree of refining, the water retention value (WRV), and the consistency of wood pulp during the refining process. The measurement time is less than 5 minutes and the sensor can operate in a slip-stream of the process line or as an at-line instrument. The consistency is obtained from a calibration, in which the attenuation of ultrasound through the pulp suspension is measured as a function of the solids weight percentage. The degree of refining and the WRV are determined from settling measurements. The settling of a pulp suspension (consistency less than 0.5 Wt%) is observed, after the mixer that keeps the pulp uniformly distributed is turned off. The attenuation of ultrasound as a function of time is recorded and these data show a peak, after a certain delay, defined as the “peak time.” The degree of refining increases with the peak time, as demonstrated by measuring pulp samples with different degrees of refining. The WRV can be determined using the relative peak time, defined as the ratio T2/T1, where T1 is an initial value of the peak time and T2 is the value after additional refining. This method offers an additional WRV test for the industry, because the freeness test is not specific for the WRV.

Greenwood, Margaret S.; Panetta, Paul D.; Bond, Leonard J.; McCaw, M. W.

2006-12-22T23:59:59.000Z

115

Diese nderung tritt nach der Genehmigung durch den am 1. April 2010 in Kraft. Sie wird im Amtsblatt der Freien Hansestadt Bremen verffentlicht.  

E-Print Network [OSTI]

Artikel 2 Diese Ă?nderung tritt nach der Genehmigung durch den am 1. April 2010 in Kraft. Sie wird Kolloquium" gestrichen. Artikel 2 Diese Ă?nderung tritt nach der Genehmigung durch den Rektor am 1. April 2010

Hoffmeister, Thomas S.

116

ITP Forest Products: Report for AIChE Pulp and Paper Industry...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Report for AIChE Pulp and Paper Industry Energy Bandwidth Study Report ITP Forest Products: Report for AIChE Pulp and Paper Industry Energy Bandwidth Study Report doebandwidth.pdf...

117

Wood Pulp Digetster Wall Corrosion Investigation  

SciTech Connect (OSTI)

The modeling of the flow in a wood pulp digester is but one component of the investigation of the corrosion of digesters. This report describes the development of a Near-Wall-Model (NWM) that is intended to couple with a CFD model that determines the flow, heat, and chemical species transport and reaction within the bulk flow of a digester. Lubrication theory approximations were chosen from which to develop a model that could determine the flow conditions within a thin layer near the vessel wall using information from the interior conditions provided by a CFD calculation of the complete digester. The other conditions will be determined by coupled solutions of the wood chip, heat, and chemical species transport and chemical reactions. The NWM was to couple with a digester performance code in an iterative fashion to provide more detailed information about the conditions within the NW region. Process Simulations, Ltd (PSL) is developing the digester performance code. This more detailed (and perhaps more accurate) information from the NWM was to provide an estimate of the conditions that could aggravate the corrosion at the wall. It is intended that this combined tool (NWM-PSL) could be used to understand conditions at/near the wall in order to develop methods to reduce the corrosion. However, development and testing of the NWM flow model took longer than anticipated and the other developments (energy and species transport, chemical reactions and linking with the PSL code) were not completed. The development and testing of the NWM are described in this report. In addition, the investigation of the potential effects of a clear layer (layer reduced in concentration of wood chips) near the wall is reported in Appendix D. The existence of a clear layer was found to enhance the flow near the wall.

Giles, GE

2003-09-18T23:59:59.000Z

118

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

of pulp mill-based integrated biorefinery with hemicellulosePilot stage Other Integrated Biorefinery Commercial statusintegrated forest biorefinery..

Kong, Lingbo

2014-01-01T23:59:59.000Z

119

Research on droplet formation for application to kraft black liquors---Final project report  

SciTech Connect (OSTI)

The objective of this project was to generate technical data to guide the design of new nozzles for kraft black liquor recovery boilers. The goal of new nozzle designs would be to narrow the droplet size distribution compared to current nozzles and to adjust for changing black liquor properties and production requirements. Uniform droplets in a recovery boiler should reduce fouling of superheater tubes and caused a more efficient burning of the black liquor, both of which result in improved energy efficiency. The research was organized into five tasks which are described in the next chapter. This fifth and final project report contains the details of Task 4 and 5 and further analysis of Task 1 results. The details of the other tasks are reported in previous technical reports. The major results from the entire project are highlighted in this section in order of significance.

Bousfield, D.W.

1990-01-01T23:59:59.000Z

120

Magnet options for sensors for the pulp and paper industry  

SciTech Connect (OSTI)

The Lawrence Berkeley National Laboratory (LBNL) has been developing sensors for the pulp and paper industry that uses a magnetic field. The applications for magnetic sensors that have studied include (1) sensors for the measurement of the water and ice content of wood chips entering the pulping mill, (2) sensors for measuring the water content and other constituents of the black liquor leaving the paper digester, and (3) sensors for measuring paper thickness and water content as the paper is being processed. These tasks can be done using nuclear magnetic resonance (NMR). The magnetic field used for doing the NMR can come from either permanent magnets or superconducting magnets. The choice of the magnet is dependent on a number of factors, which include the size of the sample and field strength needed to do the sensing task at hand. This paper describes some superconducting magnet options that can be used in the pulp and paper industry.

Green, M.A.; Barale, P.J.; Fong, C.G.; Luft, P.A.; Reimer, J.A.; Yahnke, M.S.

2001-05-05T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Swelling of kraft black liquor: an understanding of the associated phenomena during pyrolysis  

SciTech Connect (OSTI)

The objectives of this thesis were to quantify the swelling of black liquor during pyrolysis in a nitrogen atmosphere and to determine what factors were responsible for swelling. The first part of the investigation studied the process variables: pyrolysis temperature, solid content, heating rate and particle size. A temperature of 500/sup 0/C resulted in maximum swelling for the investigated temperature range of 300-900/sup 0/C. The swelling of black liquor occurred during the evolution of pyrolysis gases; however, there was no correlation found between the amount of pyrolysis gases evolved and the change in char volume. The initial solid content of black liquor had a small influence on the swelling of black liquor. The heating rate was found to effect the rate of swelling but not the final volume. Particle size had no effect on the swollen volume per unit particle weight. The effect of black liquor composition was studied. An interaction between sugar acids and kraft lignin was responsible for swelling. The extractives interfered with the swelling mechanism of black liquor, while inorganic salts acted as a diluent. The swelling behavior of black liquor appeared to be dictated by the surface active and viscous forces present in black liquor during pyrolysis. Surface active forces were evidenced by the formation of small bubbles (50-150 microns in diameter) which appeared necessary for highly swollen chars. Low swelling chars did not exhibit this phenomenon. Bubble formation began at 250/sup 0/C, which closely corresponded to the thermal decomposition temperature of sugar acids. The sugar acids formed bubbles when pyrolyzed but did not swell significantly during pyrolysis. Kraft lignin appeared to enhance the swelling of the sugar acids by increasing the viscosity and stabilizing the bubbles during pyrolysis.

Miller, P.T.

1986-01-01T23:59:59.000Z

122

A comprehensive program to develop correlations for the physical properties of kraft black liquors. Interim report No.3  

SciTech Connect (OSTI)

The black liquor properties program has conducted a systematic collection data of properties, liquor composition, and lignin characteristics. Complete data, except for some density data, has been collected for Slash Pine black liquors made by experimental pulping at a total of 25 different pulping conditions that cover the entire range used for commercial pulping. In addition, complete data has been collected for some mill liquors and partial properties or composition data has been collected on Slash Pine black liquors made at 16 different pulping conditions and some mill liquors. Data reduction methods have been developed or extended for correlation of viscosity, heat capacity, heat of dilution, and density. Correlation of properties to pulping conditions and of composition to pulping conditions has begun. In most cases, data reduction methods have been developed that are fundamentally based and that have been shown to be generally applicable to all black liquors. While it has not proven to be possible to include research for comprehensive correlations for properties for liquors from other species, we have shown that the behavior of liquors made from other species is similar to that which has been explored extensively for Slash Pine liquors. This report reviews the methods used, describes examples of data reduction methods that have been developed, and presents some preliminary results for correlation of liquor composition and properties to pulping conditions for Slash Pine black liquors.

Fricke, A.L.; Dong, D.J.; Schmidl, G.W.; Stoy, M.A.; Zaman, A.A.

1993-09-01T23:59:59.000Z

123

EXTENDING FIBER RESOURCES: FIBER LOADING RECYCLED FIBERAND MECHANICAL PULPS FOR LIGHTWEIGHT, HIGH OPACITY PAPER  

E-Print Network [OSTI]

, precipitates calcium carbonate (PCC) in situ within pulp fibers. Because paper made from fiber-loaded pulp increasing the recovery and utilization of recycled fiber and optimizing virgin fiber yield by relying moreEXTENDING FIBER RESOURCES: FIBER LOADING RECYCLED FIBERAND MECHANICAL PULPS FOR LIGHTWEIGHT, HIGH

Abubakr, Said

124

BIOMASS AND BLACK LIQUOR GASIFIER/GAS TURBINE COGENERATION AT PULP AND PAPER MILLS  

E-Print Network [OSTI]

BIOMASS AND BLACK LIQUOR GASIFIER/GAS TURBINE COGENERATION AT PULP AND PAPER MILLS ERIC D. LARSON modeling of gasifier/gas turbine pulp-mill cogeneration systemsusing gasifier designs under commercial gasification. The use of biomass fuels with gas turbines could transform a typical pulp mill from a net

125

Dried Citrus Pulp in Beef Cattle Fattening Rations.  

E-Print Network [OSTI]

occurred in the milk during the feeding trials in question. They also observed that Florida dairymen have fed a considerable quantity of fresh citrus pulp to dairy cows and heifers and that the fermenting product tended to impart a slight flavor...- T 1 I I TEXAS AGRICULTURAL EXPERIMENT STATION A. B. CONNER, DIRECTOR College Station, Texas BULLETIS NO. 613 JULY 1949 DRIED CITRUS PULP IN BEEF CATTLE FATTENING RATIONS J. H. JONES, R. A. HALL E. 31. NEAL, J. H. JONES Division of Range...

Jones, J. M. (John McKInley)

1942-01-01T23:59:59.000Z

126

Gasification of kraft black liquor and use of the products in combined cycle cogeneration. Final report, Phase II  

SciTech Connect (OSTI)

This Phase II study of kraft black liquor gasification and use of the product gases in combined cycle cogeneration based on combustion gas turbines was motivated by the very promising results of the Phase I feasibility study. The Phase I study indicated that the alternative technology to the Tomlinson recovery furnace had the potential of improving the energy efficiency and safety of combusting black liquor, reducing the capital and operating costs, increasing the electric power output, and providing an economical system for incremental kraft capacity additions. During Phase II, additional bench-scale experiments were run, pilot-scale experiments were conducted, equipment systems were investigated, and performance and economics were reanalyzed. All of the objectives of the Phase II project were met. Recommendations are summarized.

Kelleher, E.G.

1985-07-01T23:59:59.000Z

127

Using Ultrasound to Characterize Pulp Slurries with Entrained Air  

SciTech Connect (OSTI)

The development of fast and practical methods for inspecting fiber suspensions is of great interest in the paper making industry. For process control and paper quality prediction, several elements of the refining process during paper making must be accurately monitored, including specific fiber properties, weight percent fiber (composition), degree of refining, amount of solids, and entrained air content. The results of previous ultrasonic studies applied to wood pulp provide guidance that ultrasound attenuation is information rich, and it does potentially provide a tool for consistency measurement. Ultrasound has the ability to penetrate dense suspensions such as wood pulp slurries. It is has been shown, in some studies, that ultrasound is sensitive to degree of refining. The effects of entrained air, additives, the origin and treatment of the fibers do however all influence the measured data. A series of measurements were made with hardwood and softwood slurries to evaluate the ability of measuring pulp consistency, solids, and entrained air. The attenuation through the slurry was measured as the ultrasound travels from one transducer through the slurry to the other. The measurements identified the presence of entrained air in the pulp samples. To better understand the effects of air, measurements were made at increasing pressures to show how increased pressure reduced the amount of air observed in the spectrum.

Bamberger, Judith A.

2006-08-06T23:59:59.000Z

128

Nanocellulose A sustainable nanomaterial derived from wood pulp with  

E-Print Network [OSTI]

Nanocellulose A sustainable nanomaterial derived from wood pulp with applications in composites, sensors, and biomedical devices. The Sustainable Nano-Biocomposites lab in the chemical engineering-renewable resources while offering better performance. #12;Research Program Research in the Sustainable Nano

Thompson, Michael

129

This article was originally published in a journal published by Elsevier, and the attached copy is provided by Elsevier for the  

E-Print Network [OSTI]

) [15,16] have been compounded with natural fibers (such as wood, kenaf, flax, hemp, cotton, Kraft pulp

130

Methanol Fractionation of Softwood Kraft Lignin: Impact on the Lignin Properties  

SciTech Connect (OSTI)

The development of technologies to tune lignin properties for high-performance lignin-based materials is crucial for the utilization of lignin in various applications. Here, the effect of methanol (MeOH) fractionation on the molecular weight, molecular weight distribution, glass transition temperature (Tg), thermal decomposition, and chemical structure of lignin were investigated. Repeated MeOH fractionation of softwood Kraft lignin successfully removed the low-molecular-weight fraction. The separated high-molecular-weight lignin showed a Tg of 211 C and a char yield of 47%, much higher than those of asreceived lignin (Tg 153 C, char yield 41%). The MeOH-soluble fraction of lignin showed an increased low-molecular-weight fraction and a lower Tg (117 C) and char yield (32%). The amount of low-molecular-weight fraction showed a quantitative correlation with both 1/Tg and char yield in a linear regression. This study demonstrated the efficient purification or fractionation technology for lignin; it also established a theoretical and empirical correlation between the physical characteristics of fractionated lignins.

Saito, Tomonori [ORNL] [ORNL; Perkins, Joshua H [ORNL] [ORNL; Vautard, Frederic [ORNL] [ORNL; Meyer III, Harry M [ORNL] [ORNL; Messman, Jamie M [ORNL] [ORNL; Tolnai, Balazs [ORNL] [ORNL; Naskar, Amit K [ORNL] [ORNL

2014-01-01T23:59:59.000Z

131

Alabama Pine Pulp Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectricEnergy InformationTuri Biomass Facility Jump to: navigation,Pulp

132

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

that extracts lignin from black liquor with the potential todissolving in the black liquor along with lignin (Hamzeh etextracts lignin from pulp mill black liquor: LignoBoost.

Kong, Lingbo

2014-01-01T23:59:59.000Z

133

Research on droplet formation for application to kraft black liquors: Final report: Tasks I and III, report No. 4  

SciTech Connect (OSTI)

The overall objective of this project is to generate technical data with which to design nozzles for kraft black liquor recovery boilers which can reduce under and over size droplets and adjust for changing black liquor properties and production requirements. The research is organized into five tasks: Droplet formation from a single jet, theoretical and experimental--ambient gas medium; Surface tensions of black liquor; Aerodynamic/hydrodynamic stability/instability of droplets once formed; Black liquor droplet formation from a single jet--furnace gas medium; Prototype of a new nozzle design. 88 figs.

Stockel, I.H.

1988-10-01T23:59:59.000Z

134

EXTENDING FIBER RESOURCES: FIBER LOADING RECYCLED FIBER AND MECHANICAL PULPS FOR LIGHTWEIGHT, HIGH OPACITY PAPER  

E-Print Network [OSTI]

alkalinity, precipitates calcium carbonate (PCC) in situ within pulp fibers. Because paper made from fiber include increasing the recovery and utilization of recycled fiber and optimizing virgin fiber yieldEXTENDING FIBER RESOURCES: FIBER LOADING RECYCLED FIBER AND MECHANICAL PULPS FOR LIGHTWEIGHT, HIGH

Abubakr, Said

135

“What Efficiency Projects are Being Installed in the Pulp and Paper Industry”  

E-Print Network [OSTI]

for this industrial sector. This paper would discuss these projects and trends to show what is working for the real investments in efficiency for the Pulp and Paper Sector. Also included in this paper will be a description of the Pulp and Paper Energy Best Practices...

Nicol, J.

2008-01-01T23:59:59.000Z

136

Detailed Analysis of the Microbial Population in Malaysian Spontaneous Cocoa Pulp Fermentations  

E-Print Network [OSTI]

, lactic acid bacteria (LAB) and acetic acid bacteria (AAB) are the key players of this fermentationDetailed Analysis of the Microbial Population in Malaysian Spontaneous Cocoa Pulp Fermentations), Leuven, Belgium, 3 Barry Callebaut AG, Zurich, Switzerland Abstract The fermentation of cocoa pulp is one

137

emissions: mineral carbonation and Finnish pulp and paper industry (CO2  

E-Print Network [OSTI]

CO2 emissions: mineral carbonation and Finnish pulp and paper industry (CO2 Nordic Plus) and Use carbonation processes. One aspect was to verify the possible use of mineral carbon- ation for the separation, utilisation and long-term storage of carbon dioxide (CO2) in the pulp and paper industry. The Geological

Zevenhoven, Ron

138

Thermal processing of black liquor from alkaline straw pulping  

SciTech Connect (OSTI)

Black liquor is the wastewater from the cooking of wood or straw in the production of pulp and paper. Nowadays new processes are being investigated as alternatives to the traditional recovery boiler used for black liquor treatment. One of the processes which appears to be more promising is gasification, for which further research is needed for its full industrial implementation. There is not much data about the behavior of soda black liquors from straw cooking in the literature. Therefore the thermal decomposition of one of these liquors has been studied in a thermobalance, in inert (N{sub 2}) atmosphere. The kinetic constants from isothermal experiments have been obtained.

Sanchez, J.L.; Garcia, L.; Gea, G.; Bilbao, R.; Arauzo, J. [Univ. of Zaragoza (Spain)

1996-12-31T23:59:59.000Z

139

Compaction of wood chips - physical and pulping characteristics  

SciTech Connect (OSTI)

The temperatures of the uncompacted chips of Pinus taeda were, in general, higher than those of compacted chips when stored outdoors in containers for 236 days. The results of the study after storage indicated that the moisture content (MC) of compacted chips is the same as that of green chips, the uncompacted equivalent mass of chips exhibits a substantial loss in MC, and there is approximately 18% increase in MC of the uncompacted chips simulating a stockpile when compared with MC of green chips. The compaction process neither damaged wood fibers nor altered the chip response to conventional pulping.

Hassan, A.E.; Reeves, R.H.

1980-01-01T23:59:59.000Z

140

Integrated Forest Products Refinery (IFPR)  

SciTech Connect (OSTI)

Pre-extraction–kraft studies of hardwoods showed that when extracting about 10% of the wood, the final kraft pulp yield and physical properties could only be maintained at a level similar to that of regular kraft pulp when the final extract pH was close to neutral. This so-called “near neutral” pre-extraction condition at a level of 10% wood dissolution was achieved by contacting the wood chips with green liquor (GL) at a charge of about 3% (as Na2O on wood) at 160 °C for almost 2 hours (or an H-factor of about 800 hrs.). During subsequent kraft cooking of the pre-extracted hardwood chips the effective alkali charge could be reduced by about 3% (as Na2O on wood) and the cooking time shortened relative to that during regular kraft cooking, while still producing the same bleachable grade kappa number as the kraft control pulp. For softwood, no extraction conditions were discovered in the present investigation whereby both the final kraft pulp yield and physical properties could be maintained at a level similar to that of regular softwood kraft pulp. Therefore for hardwoods the “near- neutral green liquor pre-extraction conditions do meet the requirements of the IFPR concept, while for softwood, no extraction conditions were discovered which do meet these requirements. Application of simulated industrial GL at an extraction H-factor of about 800 hrs and 3% GL charge in a recirculating digester produced an hardwood extract containing about 4% (on wood) of total anhydro-sugars, 2% of acetic acid, and 1.3% of lignin. Xylan comprised of 80% of the sugars of which about 85% is oligomeric. Since only polymeric hemicelluloses and lignin may be adsorbed on pulp (produced at a yield of about 50% from the original wood), the maximum theoretical yield increase due to adsorption may be estimated as 10% on pulp (or 5% on wood). However, direct application of raw GL hardwood extract for hemicelluloses adsorption onto hardwood kraft pulp led to a yield increase of only about 1% (on pulp). By using the wet-end retention aid guar gum during the adsorption process at a charge of 0.5% on pulp the yield gain may be increased to about 5%. Unfortunately, most of this yield increase is lost during subsequent alkaline treatments in the pulp bleach plant. It was found that by performing the adsorption at alkaline conditions the adsorption loss during alkaline treatment in the bleach plant is mostly avoided. Thus a permanent adsorption yield of about 3 and 1.5% (on pulp) was obtained with addition of guar gum at a charge of 0.5 and 0.1% respectively during adsorption of GL hardwood extract on pre-extracted kraft pulp at optimal conditions of pH 11.5, 90 C for 60 minutes at 5% consistency. The beatability of the adsorbed kraft pulps was improved. Also, significant physical strength improvements were achieved. Further study is needed to determine whether the improvements in pulp yield and paper properties make this an economic IFPR concept. Application of the wood solids of a hot water extract of Acer rubrum wood strands as a substitute for polystyrene used for production of SMC maintained the water adsorption properties of the final product. Further work on the physical properties of the hemicellulose containing SMCs need to be completed to determine the potential of wood extracts for the production of partially renewable SMCs. The discovery of the “near-neutral” green liquor extraction process for hardwood was formed the basis for a commercial Integrated Biorefinery that will extract hemicelluloses from wood chips to make biofuels and other specialty chemicals. The pulp production process will be maintained as is proposed in the present researched IFBR concept. This Integrated Biorefinery will be constructed by Red Shield Acquisition LLC (RSA) at the Old Town kraft pulp mill in Maine. RSA in collaboration with the University of Maine will develop and commercialize the hemicellulose extraction process, the conversion of the hemicellulose sugars into butanol by fermentation, and the separation of specialty chemicals such as acetic acid fr

van Heiningen, Adriaan R. P.

2010-05-29T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

India's pulp and paper industry: Productivity and energy efficiency  

SciTech Connect (OSTI)

Historical estimates of productivity growth in India's pulp and paper sector vary from indicating an improvement to a decline in the sector's productivity. The variance may be traced to the time period of study, source of data for analysis, and type of indices and econometric specifications used for reporting productivity growth. The authors derive both statistical and econometric estimates of productivity growth for this sector. Their results show that productivity declined over the observed period from 1973-74 to 1993-94 by 1.1% p.a. Using a translog specification the econometric analysis reveals that technical progress in India's pulp and paper sector has been biased towards the use of energy and material, while it has been capital and labor saving. The decline in productivity was caused largely by the protection afforded by high tariffs on imported paper products and other policies, which allowed inefficient, small plants to enter the market and flourish. Will these trends continue into the future, particularly where energy use is concerned? The authors examine the current changes in structure and energy efficiency undergoing in the sector. Their analysis shows that with liberalization of the sector, and tighter environmental controls, the industry is moving towards higher efficiency and productivity. However, the analysis also shows that because these improvements are being hampered by significant financial and other barriers the industry might have a long way to go.

Schumacher, Katja

1999-07-01T23:59:59.000Z

142

Investigation of Pressurized Entrained-Flow Kraft Black Liquor Gasification in an Industrially Relevant Environment  

SciTech Connect (OSTI)

The University of Utah's project 'Investigation of Pressurized Entrained-Flow Kraft Black Liquor Gasification in an Industrially Relevant Environment' (U.S. DOE Cooperative Agreement DE-FC26-04NT42261) was a response to U.S. DOE/NETL solicitation DE-PS36-04GO94002, 'Biomass Research and Development Initiative' Topical Area 4-Kraft Black Liquor Gasification. The project began September 30, 2004. The objective of the project was to improve the understanding of black liquor conversion in high pressure, high temperature reactors that gasify liquor through partial oxidation with either air or oxygen. The physical and chemical characteristics of both the gas and condensed phase were to be studied over the entire range of liquor conversion, and the rates and mechanisms of processes responsible for converting the liquor to its final smelt and syngas products were to be investigated. This would be accomplished by combining fundamental, lab-scale experiments with measurements taken using a new semi-pilot scale pressurized entrained-flow gasifier. As a result of insufficient availability of funds and changes in priority within the Office of Biomass Programs of the U.S. Department of Energy, the research program was terminated in its second year. In total, only half of the budgeted funding was made available for the program, and most of this was used during the first year for construction of the experimental systems to be used in the program. This had a severe impact on the program. As a consequence, most of the planned research was unable to be performed. Only studies that relied on computational modeling or existing experimental facilities started early enough to deliver useful results by the time to program was terminated Over the course of the program, small scale (approx. 1 ton/day) entrained-flow gasifier was designed and installed at the University of Utah's off-campus Industrial Combustion and Gasification Research Facility. The system is designed to operate at pressures as high as 32 atmospheres, and at temperatures as high as 1500 C (2730 F). Total black liquor processing capacity under pressurized, oxygen-blown conditions should be in excess of 1 ton black liquor solids per day. Many sampling ports along the conversion section of the system will allow detailed analysis of the environment in the gasifier under industrially representative conditions. Construction was mostly completed before the program was terminated, but resources were insufficient to operate the system. A system for characterizing black liquor sprays in hot environments was designed and constructed. Silhouettes of black liquor sprays formed by injection of black liquor through a twin fluid (liquor and atomizing air) nozzle were videoed with a high-speed camera, and the resulting images were analyzed to identify overall characteristics of the spray and droplet formation mechanisms. The efficiency of liquor atomization was better when the liquor was injected through the center channel of the nozzle, with atomizing air being introduced in the annulus around the center channel, than when the liquor and air feed channels were reversed. Atomizing efficiency and spray angle increased with atomizing air pressure up to a point, beyond which additional atomizing air pressure had little effect. Analysis of the spray patterns indicates that two classifications of droplets are present, a finely dispersed 'mist' of very small droplets and much larger ligaments of liquor that form at the injector tip and form one or more relatively large droplets. This ligament and subsequent large droplet formation suggests that it will be challenging to obtain a narrow distribution of droplet sizes when using an injector of this design. A model for simulating liquor spray and droplet formation was developed by Simulent, Inc. of Toronto. The model was able to predict performance when spraying water that closely matched the vendor specifications. Simulation of liquor spray indicates that droplets on the order 200-300 microns can be expected, and that higher liquor flow will result in be

Kevin Whitty

2008-06-30T23:59:59.000Z

143

Continuous On-Line Measurement of Lignin Concentration in Wood Pulp  

E-Print Network [OSTI]

). In the second, the pulp is loaded into an open j so that the laser directly illuminates the pulp. Res Il~ obtained with the two methods are comparable e ut the open jar approach allows better control and wider variation of the pulp consistency. In both... spanning the range of Kappa numbers from approximately 15 to 55. The range of Kappa numbers was achieved by removing samples from the digester at different times so that within a set. each of the samples came from the same parent wood-chip stock...

Jeffers, L. A.; Roman, G. W.

144

Method for improving separation of carbohydrates from wood pulping and wood or biomass hydrolysis liquors  

DOE Patents [OSTI]

A method for separating carbohydrates from pulping liquors includes the steps of providing a wood pulping or wood or biomass hydrolysis pulping liquor having lignin therein, and mixing the liquor with an acid or a gas which forms an acid upon contact with water to initiate precipitation of carbohydrate to begin formation of a precipitate. During precipitation, at least one long chain carboxylated carbohydrate and at least one cationic polymer, such as a polyamine or polyimine are added, wherein the precipitate aggregates into larger precipitate structures. Carbohydrate gel precipitates are then selectively removed from the larger precipitate structures. The method process yields both a carbohydrate precipitate and a high purity lignin.

Griffith, William Louis; Compere, Alicia Lucille; Leitten Jr., Carl Frederick

2010-04-20T23:59:59.000Z

145

Alkali salt ash formation during black liquor combustion at kraft recovery boilers  

SciTech Connect (OSTI)

Recovery boiler is an essential part of paper pulping process, where waste sludge called black liquor is burned for chemical recovery and energy production. This study was carried out at an operating industrial recovery boiler in Finland. Measurement of aerosol particles was carried out at bullnose level of furnace, at boiler exit, and at outlet of electrostatic precipitator (ESP). Aerosol mass size distributions in size range 0.02--50 {micro}m were measured with Berner type low pressure impactor (BLPI) operated with precyclone. BLPI samples were further analyzed with ion chromatography for water soluble Na, K, SO{sub 4}, and Cl. Particle morphology was studied with scanning electron microscopy (SEM). Phase composition of crystalline salts was measured with X-ray diffraction (XRD). Particles larger than 1 {micro}m were analyzed with computer controlled scanning electron microscopy (CCSEM) to derive particle composition classes. At ESP inlet mass size distribution was bimodal with a major mode at about 1.2 {micro}m and a minor mode at about 5 {micro}m (aerodynamic diameter). At ESP outlet the mass size distribution showed only one peak at about 1.2 {micro}m. Both submicron and supermicron particles were agglomerates formed from 0.3 to 0.5 {micro}m spherical primary particles. XRD analyses indicated that particles were crystalline with two phases of Na{sub 2}SO{sub 4} (thenardite and sodium sulphate) and K{sub 3}Na(SO{sub 4}){sub 2}. CCSEM results of individual particles larger than 1 {micro}m showed that 79 to 88 volume percent of particles contained mainly Na and S, 7 to 10 volume percent Na, K, and S with minor amount of particles containing Na, S, and Ca.

Mikkanen, P. Kauppinen, E.I.; Pyykoenen, J.; Jokiniemi, J.K. [VTT (Finland); Maekinen, M. [Finnish Meterological Inst., Helsinki (Finland)

1996-12-31T23:59:59.000Z

146

System and method for conditioning a hardwood pulp liquid hydrolysate  

DOE Patents [OSTI]

A system and method for hardwood pulp liquid hydrolysate conditioning includes a first evaporator receives a hardwood mix extract and outputting a quantity of vapor and extract. A hydrolysis unit receives the extract, hyrolyzes and outputs to a lignin separation device, which separates and recovers a quantity of lignin. A neutralization device receives extract from the lignin separation device and a neutralizing agent, producing a mixture of solid precipitate and a fifth extract. The solid precipitate is removed from the fifth extract. A second evaporator removes a quantity of acid from the fifth extract in a vapor form. This vapor may be recycled to improve total acid recovery or discarded. A desalination device receives the diluted extract, separates out some of the acid and salt and outputs a desalinated solution.

Waite, Darrell M; Arnold, Richard; St. Pierre, James; Pendse, Hemant P; Ceckler, William H

2013-12-17T23:59:59.000Z

147

Preliminary feasibility study of pulping catalyst production from lignin  

SciTech Connect (OSTI)

A preliminary evaluation of the economic feasibility of preparing anthraquinone, a pulping catalyst, from readily available lignin has been performed. The proposed process begins with a fractionation of lignin from a black liquor stream by means of a supercritical fluid or conventional solvent extraction to give a low molecular weight fraction conductive to further chemical treatment. This fraction is sequentially oxidized with H{sub 2}O{sub 2}, treated with a diene and dehydrogenated to give anthraquinone. The cost of the proposed process is most dependent on the overall yield of the chemical processing steps with a smaller contribution noted for lignin processing. The projections indicate that anthraquinone could be produced for as low as $1.00--$1.25/lb using this process. Details of the process, chemical reactions and calculations are included.

Power, A.J. (Power (Arthur J.) and Associates, Boulder, CO (USA)); Bozell, J.J.; Chum, H.L. (Solar Energy Research Inst., Golden, CO (USA))

1989-11-01T23:59:59.000Z

148

Materials needs and opportunities in the pulp and paper industry  

SciTech Connect (OSTI)

The Department of Energy`s (DOE) Office of Industrial Technologies (OIT) supports research and development (R&D) in industry, the DOE national laboratories, and in universities to develop energy efficient, environmentally-acceptable industrial technologies. The Office of Industrial Technologies is working with seven energy-intensive industries to develop R&D roadmaps that will facilitate cooperative government-industry efforts to achieve energy-efficient, environmentally-acceptable, sustainable industries of the future. The forest products industry is one of the industries with which OIT is working to develop an R&D roadmap. The Advanced Industrial Materials (AIM) Program of the Office of Industrial Technologies sponsors long-term, directed research on materials that will enable industry to develop and utilize more energy-efficient, sustainable processes and technologies. The purpose of the study described in this report was to identify the material R&D needs and opportunities for the pulp and paper mill of the future.

Angelini, P. [comp.

1995-08-01T23:59:59.000Z

149

Simulating the dynamics of flexible wood pulp fibres in suspension John M. Stockie  

E-Print Network [OSTI]

, including wood pulp processing, polymer composites, and formation of fibre-reinforced materials elements to form a surface that re- sists bending and stretching. This is a natural construction for wood

Stockie, John

150

Advanced Powerhouse Controls Save Pulp Mill $500 in Purchased Energy in First Month  

E-Print Network [OSTI]

This case study describes the application of advanced regulatory and supervisory controls to powerhouse operations at a large pulp mill in central British Columbia. Substantial reductions in mill operating costs were achieved by actively managing...

Morrison, R.; Hilder, S.

2004-01-01T23:59:59.000Z

151

Dried Citrus Peel and Pulp as a Feed for Lactating Cows.  

E-Print Network [OSTI]

TEXAS AGRICULTURAL EXPERIMENT STATTnw A. B. CONNER, DIRECTOR, College Station, Texas I DRIED CITRUS PEEL AND PuLP As r FEED FOR LACTATING COWS 0. C. COPELAND AND C. N. SHEPARDSON Division of Dairy Husbandry AGRICULTURAL AND MECHANICAL... COLLEGE OF TE GIBB GILCHRIST, President [Blank Page in Original Bulletin] Dried citrus peel and pulp proved a satisfactory car- bonaceous feed for milk cows when used as fifty per cent of the concentrate mixture. In five separate experiments, citrus...

Copeland, O. C. (Orlin Cephas); Shepardson, C. N. (Charles Noah)

1944-01-01T23:59:59.000Z

152

Testing geopressured geothermal reservoirs in existing wells: Pauline Kraft Well No. 1, Nueces County, Texas. Final report  

SciTech Connect (OSTI)

The Pauline Kraft Well No. 1 was originally drilled to a depth of 13,001 feet and abandoned as a dry hole. The well was re-entered in an effort to obtain a source of GEO/sup 2/ energy for a proposed gasohol manufacturing plant. The well was tested through a 5-inch by 2-3/8 inch annulus. The geological section tested was the Frio-Anderson sand of Mid-Oligocene age. The interval tested was from 12,750 to 12,860 feet. A saltwater disposal well was drilled on the site and completed in a Micocene sand section. The disposal interval was perforated from 4710 to 4770 feet and from 4500 to 4542 feet. The test well failed to produce water at substantial rates. Initial production was 34 BWPD. A large acid stimulation treatment increased productivity to 132 BWPD, which was still far from an acceptable rate. During the acid treatment, a failure of the 5-inch production casing occurred. The poor production rates are attributed to a reservoir with very low permeability and possible formation damage. The casing failure is related to increased tensile strain resulting from cooling of the casing by acid and from the high surface injection pressure. The location of the casing failure is now known at this time, but it is not at the surface. Failure as a result of a defect in a crossover joint at 723 feet is suspected.

Not Available

1981-01-01T23:59:59.000Z

153

Sacrificial adsorbate for surfactants utilized in chemical floods of enhanced oil recovery operations  

SciTech Connect (OSTI)

The present invention is directed to a sacrificial or competitive adsorbate for surfactants contained in chemical flooding emulsions for enhanced oil recovery operations. The adsorbate to be utilized in the method of the present invention is a caustic effluent from the bleach stage or the weak black liquor from the digesters and pulp washers of the kraft pulping process. This effluent or weak black liquor is injected into an oil-bearing subterranean earth formation prior to or concurrent with the chemical flood emulsion and is adsorbed on the active mineral surfaces of the formation matrix so as to effectively reduce adsorption of surfactant in the chemical flood. Alternatively, the effluent or liquor can be injected into the subterranean earth formation subsequent to a chemical flood to displace the surfactant from the mineral surfaces for the recovery thereof.

Johnson, J.S.; Westmoreland, C.G.

1982-02-02T23:59:59.000Z

154

Sacrificial adsorbate for surfactants utilized in chemical floods of enhanced oil recovery operations  

DOE Patents [OSTI]

The present invention is directed to a sacrificial or competitive adsorbate for surfactants contained in chemical flooding emulsions for enhanced oil recovery operations. The adsorbate to be utilized in the method of the present invention is a caustic effluent from the bleach stage or the weak black liquor from the digesters and pulp washers of the kraft pulping process. This effluent or weak black liquor is injected into an oil-bearing subterranean earth formation prior to or concurrent with the chemical flood emulsion and is adsorbed on the active mineral surfaces of the formation matrix so as to effectively reduce adsorption of surfactant in the chemical flood. Alternatively, the effluent or liquor can be injected into the subterranean earth formation subsequent to a chemical flood to displace the surfactant from the mineral surfaces for the recovery thereof.

Johnson, Jr., James S. (Oak Ridge, TN); Westmoreland, Clyde G. (Rockwood, TN)

1982-01-01T23:59:59.000Z

155

Sacrificial adsorbate for surfactants utilized in chemical floods of enhanced oil recovery operations  

DOE Patents [OSTI]

The present invention is directed to a sacrificial or competitive adsorbate for surfactants contained in chemical flooding emulsions for enhanced oil recovery operations. The adsorbate to be utilized in the method of the present invention is a caustic effluent from the bleach stage or the weak black liquor from the digesters and pulp washers of the kraft pulping process. This effluent or weak black liquor is injected into an oil-bearing subterranean earth formation prior to or concurrent with the chemical flood emulsion and is adsorbed on the active mineral surfaces of the formation matrix so as to effectively reduce adsorption of surfactant in the chemical flood. Alternatively, the effluent or liquor can be injected into the subterranean earth formation subsequent to a chemical flood to displace the surfactant from the mineral surfaces for the recovery thereof.

Johnson, J.S. Jr.; Westmoreland, C.G.

1980-08-20T23:59:59.000Z

156

Proceedings of the 6th international Conference on Biotechnology in the Pulp and Paper Industry: Advances in Applied and Fundamental Research  

E-Print Network [OSTI]

Proceedings of the 6th international Conference on Biotechnology in the Pulp and Paper Industry during refining, improved paper strength properties, and reduced the environmental impact of pulping (2 for pulping. The chemical demand can also be lessened due to prior degradation of the lignin by the fungus

Abubakr, Said

157

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

SciTech Connect (OSTI)

The U.S. pulp and paper industry consumes over $7 billion worth of purchased fuels and electricity per year. Energy efficiency improvement is an important way to reduce these costs and to increase predictable earnings, especially in times of high energy price volatility. There are a variety of opportunities available at individual plants in the U.S. pulp and paper industry to reduce energy consumption in a cost-effective manner. This paper provides a brief overview of the U.S. EPA ENERGY STAR(R) for Industry energy efficiency guidebook (a.k.a. the"Energy Guide") for pulp and paper manufacturers. The Energy Guide discusses a wide range of energy efficiency practices and energy-efficient technologies that can be implemented at the component, process, facility, and organizational levels. Also provided is a discussion of the trends, structure, and energy consumption characteristics of the U.S. pulp and paper industry along with a description of the major process technologies used within the industry. Many energy efficiency measure descriptions include expected savings in energy and energy-related costs, based on case study data from real-world applications in pulp and paper mills and related industries worldwide. The information in this Energy Guide is intended to help energy and plant managers in the U.S. pulp and paper industry reduce energy consumption in a cost-effective manner while maintaining the quality of products manufactured. Further research on the economics of all measures?as well as on their applicability to different production practices?is needed to assess their cost effectiveness at individual plants.

Kramer, Klaas Jan; Masanet, Eric; Worrell, Ernst

2009-01-01T23:59:59.000Z

158

Minimizing Energy Costs Through Water Management in the Pulp and Paper Industry  

E-Print Network [OSTI]

The quantity of steam required by a pulp and paper mill, as well as the quantity of power generated can effectively be optimized by managing the water cycles in the mill. This approach addresses the process systems within the mill and investigates...

Wilson, P. H.

159

Energy Conservation Progress and Opportunities in the Pulp and Paper Industry  

E-Print Network [OSTI]

In 1980 the pulp and paper industry was the third ranking consumer of total purchased fuels and energy in the U.S. industrial sector and the highest single industry in terms of residual oil consumption. Over the past decade in response to rapidly...

Watkins, J. J.; Hunter, W. D.

1984-01-01T23:59:59.000Z

160

Der Oktapod Kraft-und Momentensensor (Otto Bock HealthCare GmbH) ist ein Dehnungsmesstreifen basiertes System fr den direkten Einbau in Beinprothesen. Damit knnen die Belastungen der Prothese in allen  

E-Print Network [OSTI]

Der Oktapod Kraft- und Momentensensor (Otto Bock HealthCare GmbH) ist ein Dehnungsmesstreifen automatischen Kalibrator (Otto Bock HealthCare, Duderstadt) Auswertung der Messdaten o Optimierung der Berlin erfolgt durch Dipl.-Ing. Julius Thiele, von Seiten der Otto Bock HealthCare GmbH erfolgt sie durch

Berlin,Technische Universität

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Elemental content of enamel and dentin after bleaching of teeth (a comparative study between laser-induced breakdown spectroscopy and x-ray photoelectron spectroscopy)  

SciTech Connect (OSTI)

The elemental content of the superficial and inner enamel as well as that of dentin was analyzed using laser-induced breakdown spectroscopy (LIBS) and x-ray photoelectron spectroscopy (XPS) of bleached and unbleached tooth specimens. It is thus clear from the spectral analysis using both the LIBS and XPS technique that elemental changes (though insignificant within the scopes of this study) of variable intensities do occur on the surface of the enamel and extend deeper to reach dentin. The results of the LIBS revealed a slight reduction in the calcium levels in the bleached compared to the control specimens in all the different bleaching groups and in both enamel and dentin. The good correlation found between the LIBS and XPS results demonstrates the possibility of LIBS technique for detection of minor loss in calcium and phosphorus in enamel and dentin.

Imam, H. [National Institute of Laser Enhanced Sciences, NILES, Cairo University, Giza (Egypt)] [National Institute of Laser Enhanced Sciences, NILES, Cairo University, Giza (Egypt); Ahmed, Doaa [Department of Restorative Sciences, Faculty of Dentistry, Alexandria University, Alexandria (Egypt)] [Department of Restorative Sciences, Faculty of Dentistry, Alexandria University, Alexandria (Egypt); Eldakrouri, Ashraf [National Institute of Laser Enhanced Sciences, NILES, Cairo University, Giza (Egypt) [National Institute of Laser Enhanced Sciences, NILES, Cairo University, Giza (Egypt); Department of Optometry and Vision Science, College of Applied Medical Science, King Saud University, Riyadh (Saudi Arabia)

2013-06-21T23:59:59.000Z

162

Steam System Opportunity Assessment for the Pulp and Paper, Chemical Manufacturing, and Petroleum Refining Industries: Main Report  

SciTech Connect (OSTI)

This report assesses steam generation and use in the pulp and paper, chemical, and petroleum refining industries, and estimates the potential for energy savings from implementation of steam system performance and efficiency improvements.

Not Available

2002-10-01T23:59:59.000Z

163

Long term experiences of the use of duplex stainless steel to combat corrosion in the pulp and paper industry  

SciTech Connect (OSTI)

Duplex (austenitic/ferritic) stainless steels offer properties of interest and a cost effective material selection solution for plant and equipment in the pulp and paper industry. The characteristics of duplex steels leading to successful long term applications of 22 Cr duplex and a copper containing 25 Cr super duplex stainless steel are reviewed. It is concluded that, applied correctly, two-phase stainless steels can provide long term reliable maintenance-free service in many pulp and paper plant environments.

Bendall, K.C. [Langley Alloys Ltd., Maidenhead (United Kingdom)

1996-08-01T23:59:59.000Z

164

On-line measurement of lignin in wood pulp by color shift of fluorescence  

DOE Patents [OSTI]

Lignin concentrations from wood pulp samples are measured by applying an excitation light at a selected wavelength to the samples in order to cause the lignin to emit fluorescence. A spectral distribution of the fluorescence emission is then determined. The lignin concentration is then calculated based on the spectral distribution signal. The spectral distribution is quantified by either a wavelength centroid method or a band ratio method. 6 figs.

Jeffers, L.A.; Malito, M.L.

1996-01-23T23:59:59.000Z

165

On-line measurement of lignin in wood pulp by color shift of fluorescence  

DOE Patents [OSTI]

Lignin concentrations from wood pulp samples are measured by applying an excitation light at a selected wavelength to the samples in order to cause the lignin to emit fluorescence. A spectral distribution of the fluorescence emission is then determined. The lignin concentration is then calculated based on the spectral distribution signal. The spectral distribution is quantified by either a wavelength centroid method or a band ratio method.

Jeffers, Larry A. (Washington Township, Stark County, OH); Malito, Michael L. (Liberty Township, Trumbull County, OH)

1996-01-01T23:59:59.000Z

166

Investment-Grade Compressed Air System Audit, Analysis, and Upgrade in a Pulp and Paper Mill  

E-Print Network [OSTI]

INVESTMENT-GRADE COMPRESSED AIR SYSTEM AUDIT, ANALYSIS, AND UPGRADE IN A PULP & PAPER MILL Paresh S. Parekh, P.E. Principal ABSTRACT An investment-grade compressed air audit, analysis, design, and upgrade in an industrial facility requires a..., West Tacoma Division, located in Washington State, had production capability of 540 tons per day of recycle newsprint manufactured from TMP and recycled paper. Over the years, as mill capacity increased, various sizes and types of air compressor...

Parekh, P. S.

167

Correlation of Process Data and Electrocheical Noise to Assess Kraft Digester Corrosion: Second Year at Spring Grove  

SciTech Connect (OSTI)

Electrochemical noise (EN) probes were deployed in the carbon steel continuous kraft digester at Spring Grove at four locations and at one location in the bottom cone of the associated flash tank for a second consecutive year of a corrosion study. The probes contained dual electrodes of 309LSi stainless steel overlay--representing a field repair material applied to a portion of the vessel--and dual electrodes of 312 stainless steel overlay. Current and potential noise, the temperature at each probe location, and the value of 23 process parameters (flow rates, liquor chemistry, etc.) were again monitored continuously for a period of almost one year. Historical vessel inspection data and post-test evaluation of the probe components were used to assess/compare EN corrosion activity with physical changes in wall thickness and corrosion patterns on the digester shell. In addition, attempts were made to correlate EN activity from each electrode type with process parameters. The results indicate the corrosion conditions aggressive to mild steel persist within the digester, as post-test inspection of the vessel revealed localized corrosion of mild steel in locations previously free of attack. Further, there was evidence that the depth of localized attack of exposed steel had increased in some locations. Nevertheless, the stainless steel overlay in the digester was essentially immune to corrosion, as evidenced by retained surface relief and heat tint associated with the original deposition process. The 309LSi electrodes also appeared visually pristine, and post-exposure metallographic examination of the 309LSi electrode materials revealed no attack. The 312 electrode materials were similar in appearance, but exhibited very minor interdendritic attack over the exposed surface. The silver electrodes in the probes were consumed (to Ag{sub 2}S) to variable degree over the course of the exposure indicating a useful life of not more than a year in digester service in this vessel. Since the stainless steel overlay electrodes were immune to corrosion during the exposure, the current and potential noise activity on these probes is likely related to redox processes on the electrode surfaces. Analysis of this activity as a function of position (and year) in the vessel suggests that redox chemistry/conditions vary by a significant amount on a consistent basis--even on opposite sides of the vessel at the same elevation--and that these differences are not identified by process parameters tracked at the mill. These variable environmental conditions (flow, temperature, liquor chemistry) appear to have little effect on stainless steel overlays under evaluation, but apparently can be quite corrosive to steel as determined in the initial study in the digester at Spring Grove. With the exception of start-up and shutdown activity, including brief upsets for ''hanging columns'' or brief maintenance periods, no regular correlation was observed between tracked process variables and EN activity on any of the probes. In combination with the variable redox activity, this result suggests that the liquor sampling and flow data compiled at the mill do not represent the corrosion conditions in the vessel particularly well.

Pawel, SJ

2004-04-27T23:59:59.000Z

168

Quageo-D-06-00012 (Revised sept.2006) Residual thermoluminescence for sun-bleached quartz: dependence on pre-exposure radiation  

E-Print Network [OSTI]

1 Quageo-D-06-00012 (Revised sept.2006) Title Residual thermoluminescence for sun-bleached quartz irradiated - either in the laboratory, or naturally in volcanic deposits - were exposed to sunlight for several months prior to TL measurements. As a result, the residual TL, either Blue or Red, appeared

Paris-Sud XI, Université de

169

Development and pilot testing of modular dynamic thermomechanical pulp mill model to develop energy reduction strategies. Final report  

SciTech Connect (OSTI)

With the development of on-line and real-time process simulations, one obtains the ability to predict and control the process; thus, the opportunity exists to improve energy efficiency, decrease materials wastes, and maintain product quality. Developing this capability was the objective of the this research program. A thermomechanical pulp mill was simulated using both a first principles model and a neural network. The models made use of actual process data and a model that calculated the mass and energy balance of the mill was successfully implemented and run at the mill on an hourly basis. The attempt to develop a model that accurately predicted the quality of the pulp was not successful. It was concluded that the key fro a successful implementation of a real-time control model, such as a neural net model, is availability of on-line sensors that sufficiently characterize the pulp.

Coffin, D.W.

1996-10-01T23:59:59.000Z

170

Pulp and paper mill of the future: A workshop. Final report  

SciTech Connect (OSTI)

This workshop began with sessions to consider where the industry is likely to be, or ideally where it should be, say, by the year 2020. The next sessions considered the `drivers` that motivate the industry to change. These drivers could be motivations towards the vision developed earlier, or they may be forces that tend to prevent the vision of the future form being realized. The final sessions focused on what techniques are being (or should be) developed in four major process areas of a typical manufacturing plant, consistent with the previously identified vision of a future pulp or paper mill.

Fleischman, E. [EG and G Idaho, Inc., Idaho Falls, ID (United States); Sobczynski, S.F. [USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States). Office of Industrial Technologies

1993-10-01T23:59:59.000Z

171

Presentation 3.1: Report on energy efficient technologies and CO2 reduction potentials in the pulp and paper industry  

E-Print Network [OSTI]

, at the International Energy Agency in Paris. The goal of the workshop is to better quantify the global potentialPresentation 3.1: Report on energy efficient technologies and CO2 reduction potentials in the pulp, and it will imply a fundamental rethinking of the sector's strategy. 251 #12;#12;INTERNATIONAL ENERGY AGENCY AGENCE

172

Digestion ruminale compare du son et de la pulpe de betteraves chez le mouton et la vache  

E-Print Network [OSTI]

Digestion ruminale comparée du son et de la pulpe de betteraves chez le mouton et la vache M (*) Laboratoire des Aliments (**) Laboratoire de la Digestion l.N.R.A., Theix, 63122 Ceyrat, France. Summary. Ruminal digestion was compared in cows and sheep receiving ad libitum 40 % hay and 60 % wheat bran or beet

Boyer, Edmond

173

Changing Trends in the Bulk Chemicals and Pulp and Paper Industries (released in AEO2005)  

Reports and Publications (EIA)

Compared with the experience of the 1990s, rising energy prices in recent years have led to questions about expectations of growth in industrial output, particularly in energy-intensive industries. Given the higher price trends, a review of expected growth trends in selected industries was undertaken as part of the production of Annual Energy Outlook 2005 (AEO). In addition, projections for the industrial value of shipments, which were based on the Standard Industrial Classification (SIC) system in AEO2004, are based on the North American Industry Classification System (NAICS) in AEO2005. The change in industrial classification leads to lower historical growth rates for many industrial sectors. The impacts of these two changes are highlighted in this section for two of the largest energy-consuming industries in the U.S. industrial sector-bulk chemicals and pulp and paper.

2005-01-01T23:59:59.000Z

174

Ten case history studies of energy efficiency improvements in pulp and paper mills. Final report  

SciTech Connect (OSTI)

The ten technologies chosen for case history development are: sonic sootblowing in boilers, boiler operation on oil-water emulsified fuel, energy efficient motors, computerized control of excess air for boilers, boiler control and load allocation, driving of waste-activated sludge by multiple effect evaporation, pre-drying of hog fuel, lime kiln computerization, heat wheel for process heat recovery, and organic Rankine bottoming cycle for thermomechanical pulping heat recovery. For each case study, there is given: the company name, employee contact, plant summary, a description of the energy consuming process and of the energy-saving action, an assessment of energy savings, and the decision process leading to the adoption of the measure. A data summary for discounted cash flow analysis is tabulated for each case. (LEW)

Not Available

1981-01-01T23:59:59.000Z

175

Figure 2 Collect 5 horizontally  

E-Print Network [OSTI]

storage containers, (e.g., resealable plastic containers) 5% bleach solution Aluminum foil Newspaper, Butcher or Kraft paper Rigid shipping container, (e.g., cardboard box, etc.) Frozen ice packs Packing tape

Mukhtar, Saqib

176

Energy Efficiency in the Pulp and Paper Industry: Simulation of Steam Challenge and CHP Incentives with ITEMS  

E-Print Network [OSTI]

ENERGY EFFICIENCY IN THE PULP AND PAPER INDUSTRY: SIMULATION OF STEAM CHALLENGE AND CHP INCENTIVES WITH ITEMS Joseph M. Roop Staff Scientist Pacific Northwest National Laboratory Richland, Washington ABSTRACT# Two programs being.... This document number is PNNL-SA-29768. ? Referred to as ISTUM in (3). industry (here, we use the newer acronym CHP for" combined heat and power"). Our use of ITEMS demonstrates that such programs can be analyzed, and their effec tiveness assessed using...

Roop, J. M.

177

Opportunities to improve energy efficiency and reduce greenhouse gas emissions in the US pulp and paper industry  

SciTech Connect (OSTI)

The pulp and paper industry accounts for over 12% of total manufacturing energy use in the US (US EIA 1997a), contributing 9% to total manufacturing carbon dioxide emissions. In the last twenty-five years primary energy intensity in the pulp and paper industry has declined by an average of 1% per year. However, opportunities still exist to reduce energy use and greenhouse gas emissions in the manufacture of paper in the US This report analyzes the pulp and paper industry (Standard Industrial Code (SIC) 26) and includes a detailed description of the processes involved in the production of paper, providing typical energy use in each process step. We identify over 45 commercially available state-of-the-art technologies and measures to reduce energy use and calculate potential energy savings and carbon dioxide emissions reductions. Given the importance of paper recycling, our analysis examines two cases. Case A identifies potential primary energy savings without accounting for an increase in recycling, while Case B includes increasing paper recycling. In Case B the production volume of pulp is reduced to account for additional pulp recovered from recycling. We use a discount rate of 30% throughout our analysis to reflect the investment decisions taken in a business context. Our Case A results indicate that a total technical potential primary energy savings of 31% (1013 PJ) exists. For case A we identified a cost-effective savings potential of 16% (533 PJ). Carbon dioxide emission reductions from the energy savings in Case A are 25% (7.6 MtC) and 14% (4.4 MtC) for technical and cost-effective potential, respectively. When recycling is included in Case B, overall technical potential energy savings increase to 37% (1215 PJ) while cost-effective energy savings potential is 16%. Increasing paper recycling to high levels (Case B) is nearly cost-effective assuming a cut-off for cost-effectiveness of a simple payback period of 3 years. If this measure is included, then the cost-effective energy savings potential in case B increases to 22%.

Martin, Nathan; Anglani, N.; Einstein, D.; Khrushch, M.; Worrell, E.; Price, L.K.

2000-07-01T23:59:59.000Z

178

Opportunities to improve energy efficiency and reduce greenhouse gas emissions in the U.S. pulp and paper industry  

SciTech Connect (OSTI)

The pulp and paper industry accounts for over 12% of total manufacturing energy use in the U.S. (U.S. EIA 1997a), contributing 9% to total manufacturing carbon dioxide emissions. In the last twenty-five years primary energy intensity in the pulp and paper industry has declined by an average of 1% per year. However, opportunities still exist to reduce energy use and greenhouse gas emissions in the manufacture of paper in the U.S. This report analyzes the pulp and paper industry (Standard Industrial Code (SIC) 26) and includes a detailed description of the processes involved in the production of paper, providing typical energy use in each process step. We identify over 45 commercially available state-of-the-art technologies and measures to reduce energy use and calculate potential energy savings and carbon dioxide emissions reductions. Given the importance of paper recycling, our analysis examines two cases. Case A identifies potential primary energy savings without accounting for an increase in recycling, while Case B includes increasing paper recycling. In Case B the production volume of pulp is reduced to account for additional pulp recovered from recycling. We use a discount rate of 30% throughout our analysis to reflect the investment decisions taken in a business context. Our Case A results indicate that a total technical potential primary energy savings of 31% (1013 PJ) exists. For case A we identified a cost-effective savings potential of 16% (533 PJ). Carbon dioxide emission reductions from the energy savings in Case A are 25% (7.6 MtC) and 14% (4.4 MtC) for technical and cost-effective potential, respectively. When recycling is included in Case B, overall technical potential energy savings increase to 37% (1215 PJ) while cost-effective energy savings potential is 16%. Increasing paper recycling to high levels (Case B) is nearly cost-effective assuming a cut-off for cost-effectiveness of a simple payback period of 3 years. If this measure is included, then the cost-effective energy savings potential in case B increases to 22%.

Martin, Nathan; Anglani, N.; Einstein, D.; Khrushch, M.; Worrell, E.; Price, L.K.

2000-07-01T23:59:59.000Z

179

Improved Wood Properties Through Genetic Manipulation: Engineering of Syringyl Lignin in Softwood Species Through Xylem-Specific Expression of Hardwood Syringyl Monolignol Pathway Genes  

SciTech Connect (OSTI)

Project Objective: Our long-term goal is to genetically engineer higher value raw materials with desirable wood properties to promote energy efficiency, international competitiveness, and environmental responsiveness of the U.S. forest products industry. The immediate goal of this project was to produce the first higher value softwood raw materials engineered with a wide range of syringyl lignin quantities. Summary: The most important wood property affecting directly the levels of energy, chemical and bleaching requirements for kraft pulp production is lignin. Softwoods contain almost exclusively chemically resistant guaiacyl (G) lignin, whereas hardwoods have more reactive or easily degradable lignins of the guaiacyl (G)-syringyl (S) type. It is also well established that the reactive S lignin component is the key factor that permits much lower effective alkali and temperature, shorter pulping time and less bleaching stages for processing hardwoods than for softwoods. Furthermore, our pulping kinetic study explicitly demonstrated that every increase in one unit of the lignin S/G ratio would roughly double the rate of lignin removal. These are clear evidence that softwoods genetically engineered with S lignin are keys to revolutionizing the energy efficiency and enhancing the environmental performance of this industry. Softwoods and hardwoods share the same genetic mechanisms for the biosynthesis of G lignin. However, in hardwoods, three additional genes branch out from the G-lignin pathway and become specifically engaged in regulating S lignin biosynthesis. In this research, we simultaneously transferred aspen S-specific genes into a model softwood, black spruce, to engineer S lignin.

Chandrashekhar P. Joshi; Vincent L. Chiang

2009-01-29T23:59:59.000Z

180

Opportunities to improve energy efficiency in the U.S. pulp and paper industry  

SciTech Connect (OSTI)

This paper analyzes the energy efficiency and carbon dioxide emissions reductions potential of the U.S. pulp and paper industry, one of the largest energy users in the U.S. manufacturing sector. We examined over 45 commercially available state-of-the-art technologies and measures. The measures were characterized, and then ordered on the basis of cost-effectiveness. The report indicates that there still exists significant potential for energy savings and carbon dioxide emissions reduction in this industry. The cost-effective potential for energy efficiency improvement is defined as having a simple pay-back period of three years or less. Not including increased recycling the study identifies a cost-effective savings potential of 16% of the primary energy use in 1994. Including increased recycling leads to a higher potential for energy savings, i.e. a range of cost-effective savings between 16% and 24% of primary energy use. Future work is needed to further elaborate on key energy efficiency measures identified in the report including barriers and opportunities for increased recycling of waste paper.

Worrell, Ernst; Martin, Nathan; Anglani, Norma; Einstein, Dan; Krushch, Marta; Price, Lynn

2001-02-02T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Ethanol production from spent sulfite liquor fortified by hydrolysis of pulp mill primary clarifier sludge  

SciTech Connect (OSTI)

Some low-yield sulfite pulping operations ferment spent sulfite liquor (SSL) to remove biochemical oxygen demand associated with dissolved sugars while at the same time generating ethanol as a salable product. Simultaneous saccharification and fermentation (SSF) of primary clarifier sludge in a medium of SSL was proposed as a means of reducing the amount of sludge to be disposed of while at the same time increasing ethanol productivity. In this article, the option of fortifying existing SSL fermenting processes with the sugars produced via in situ enzymatic hydrolysis of sulfite primary clarifier sludge (PCS) has been explored. In 100% SSL PCS hydrolysis rates as high as 3.4 g/(L{center_dot}h) were observed at an initial enzyme loading of 10 filter paper units (FPU)/g PCS. To reduce the deleterious effects of glucose inhibition, single-stage SSF was carried out using cellulose enzymes and Saccharomyces cerevisiae. The production rate of ethanol in SSL was increased by as much as 25% through the SSF process. 12 refs., 4 figs., 2 tabs.

Moritz, J.W.; Duff, S.J.B. [Univ. of British Columbia, Vancouver (Canada)

1996-12-31T23:59:59.000Z

182

Separation and characterization of lignins from the black liquor of oil palm trunk fiber pulping  

SciTech Connect (OSTI)

Six lignin preparations, isolated by a novel two-step precipitation method instead of the traditional one-step precipitation method from the oil palm trunk fiber pulping (OPTFP) black liquor, were found to be relatively free of nonlignin materials such as polysaccharide degradation products, ash, and salts. A lignin fraction with a purity of 99.5% was obtained at an optimum precipitation pH 1.5 after isolation of the nonlignin materials in ethanol. About 94% of the total lignin was recovered by this novel method at this condition, and the value of COD in the treated black liquor reduced significantly to lower 250. The isolated lignin fractions contained syringyl, guaiacyl, and p-hydroxyphenyl units in an approximate molar ratio of 16--20:5:1 on the basis of chemical and spectroscopic analysis. Small amounts of p-hydroxybenzoic acids were found to be esterified to lignin, while ferulic acids were associated to lignin by ether linkage. {sup 13}C-NMR indicated the presence of {beta}-O-4 ether bonds, and {beta}-5 and 5-5{prime} carbon-carbon linkages between the lignin molecules.

Sun, R.; Tomkinson, J.; Bolton, J.

1999-11-01T23:59:59.000Z

183

Kraft Rt Kraft Electronics Inc | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to:46 - 429 Throttled (botOpen6Kentwood,GeorgeKlimaschutzKosmo Solar

184

Trees Containing Built-In Pulping Catalysts - Final Report - 08/18/1997 - 08/18/2000  

SciTech Connect (OSTI)

Several hardwood and softwood trees were analyzed for the presence of anthraquinone-type molecules. Low levels of anthraquinone (AQ) and anthrone components were detected using gas chromatography-mass spectroscopy and sensitive selected-ion monitoring techniques. Ten out of seventeen hardwood samples examined contained AQ-type components; however, the levels were typically below {approximately}6 ppm. No AQs were observed in the few softwood samples that were examined. The AQs were more concentrated in the heartwood of teak than in the sapwood. The delignification of pine was enhanced by the addition of teak chips ({approximately}0.7% AQ-equivalence content) to the cook, suggesting that endogenous AQs can be released from wood during pulping and can catalyze delignification reactions. Eastern cottonwood contained AQ, methyl AQ, and dimethyl AQ, all useful for wood pulping. This is the first time unsubstituted AQ has been observed in wood extracts. Due to the presence of these pulping catalysts, rapid growth rates in plantation settings, and the ease of genetic transformation, eastern cottonwood is a suitable candidate for genetic engineering studies to enhance AQ content. To achieve effective catalytic pulping activity, poplar and cottonwood, respectively, require {approximately}100 and 1000 times more for pulping catalysts. A strategy to increase AQ concentration in natural wood was developed and is currently being tested. This strategy involves ''turning up'' isochorismate synthase (ICS) through genetic engineering. Isochorismate synthase is the first enzyme in the AQ pathway branching from the shikimic acid pathway. In general, the level of enzyme activity at the first branch point or committed step controls the flux through a biosynthetic pathway. To test if the level of ICS regulates AQ biosynthesis in plant tissues, we proposed to over-express this synthase in plant cells. A partial cDNA encoding a putative ICS was available from the random cDNA sequencing project carried out with Arabidopsis thaliana. We used this putative plant ICS gene fragment to isolate and sequence a full-length ICS cDNA from Arabidopsis thaliana. The putative full-length cDNA encodes for a 569 amino acid protein of {approximately}62kDa. This sequence represents the first full-length ICS cDNA isolated from a plant. When inserted into E. coli, our isolated cDNA over-expressed ICS protein in the insoluble inclusion bodies. A plant expression vector containing the ICS cDNA, NP II for selection on the antibiotic kanamycin, and duplicated 35S-cauliflower mosaic virus promoter were inserted into Agrobacterium tumefaciens strain GV3101. Transformation experiments for insertion of these foreign genes into Populus deltoides 'C175' resulted in eight lines able to regenerate shoots and grow roots in the presence of kanamycin. Plants from these eight lines have acclimated to growth in sterile soil and will be moved to a greenhouse environment in spring 2001. Non rooted shoots from each line are currently being multiplied by shoot culture. When enough shoot tissue and/or greenhouse plant stem tissue is available, AQ analysis will be done and compared with non transformed control tissue.

Pullman, G.; Dimmel, D.; Peter, G.

2000-08-18T23:59:59.000Z

185

Using Ex Post Data to Estimate the Hurdle Rate of Abatement Investments -An Application to the Swedish Pulp and Paper Industry  

E-Print Network [OSTI]

Using Ex Post Data to Estimate the Hurdle Rate of Abatement Investments - An Application to Estimate the Hurdle Rate of Abatement Investments - An Application to the Swedish Pulp and Paper Industry in pollution abatement technology, using ex post data. The method is based on a structural option value model

Paris-Sud XI, Université de

186

Parallell to that, we observed a marked improvement of the feed efficiency that can be attributed to the good energy value of the sugar beet pulp for rabbits.  

E-Print Network [OSTI]

of lucerne proteins by those of soyabean meal or milk powder in a balanced diet for growing rabbits for different kinds of fibre (hemicellulose, true cel- lulose and lignin) are not determined. Comparing lucerne diets based on lucerne, safflower meal, grape pomace and beet pulp. Though not significant, feeding

Paris-Sud XI, Université de

187

Pulp and paper mill fibrous residuals in excavatable flowable fill Y.-m. Chun, T.R. Naik, & R.N. Kraus  

E-Print Network [OSTI]

biological treatment of wastewater. Fiber reclaim is composed of wood cellulose fibers and moisture mills Fibrous residuals from pulp and paper mills include wastewater-treatment residuals (also called sludge), fiber reclaim, and screening rejects. The basic components of the wastewater-treatment residuals

Wisconsin-Milwaukee, University of

188

Energy Efficient Catalytic Activation of Hydrogen peroxide for Green Chemical Processes: Final Report  

SciTech Connect (OSTI)

A new, highly energy efficient approach for using catalytic oxidation chemistry in multiple fields of technology has been pursued. The new catalysts, called TAML® activators, catalyze the reactions of hydrogen peroxide and other oxidants for the exceptionally rapid decontamination of noninfectious simulants (B. atrophaeus) of anthrax spores, for the energy efficient decontamination of thiophosphate pesticides, for the facile, low temperature removal of color and organochlorines from pulp and paper mill effluent, for the bleaching of dyes from textile mill effluents, and for the removal of recalcitrant dibenzothiophene compounds from diesel and gasoline fuels. Highlights include the following: 1) A 7-log kill of Bacillus atrophaeus spores has been achieved unambiguously in water under ambient conditions within 15 minutes. 2) The rapid total degradation under ambient conditions of four thiophosphate pesticides and phosphonate degradation intermediates has been achieved on treatment with TAML/peroxide, opening up potential applications of the decontamination system for phosphonate structured chemical warfare agents, for inexpensive, easy to perform degradation of stored and aged pesticide stocks (especially in Africa and Asia), for remediation of polluted sites and water bodies, and for the destruction of chemical warfare agent stockpiles. 3) A mill trial conducted in a Pennsylvanian bleached kraft pulp mill has established that TAML catalyst injected into an alkaline peroxide bleach tower can significantly lower color from the effluent stream promising a new, more cost effective, energy-saving approach for color remediation adding further evidence of the value and diverse engineering capacity of the approach to other field trials conducted on effluent streams as they exit the bleach plant. 4) Dibenzothiophenes (DBTs), including 4,6-dimethyldibenzothiophene, the most recalcitrant sulfur compounds in diesel and gasoline, can be completely removed from model gasoline (octane or decane) at low temperature and ambient pressure via treatment with a TAML activator and hydrogen peroxide in a two-phase system consisting of the fuel as the first phase and a water/tertiary butanol second phase. The DBTs are oxidized to sulphones (or sulfoxides), which then completely extract into the water/t-butanol phase. Treatment of commercial diesel spiked with DBT under the same conditions results in compete DBT oxidation. In contrast with the octane and decane experiments, removal to the water/t-butanol phase is not yet complete and is being further optimized. Analysis by the sulfur specific GC-FPD technique suggests that >70% sulfur compounds are removed from unspiked diesel after one treatment. Further treatments are being investigated. The GC-FPD results will be checked by total sulfur analysis methodology.

Collins, Terrence J.; Horwitz, Colin

2004-11-12T23:59:59.000Z

189

Detection of estrogen- and dioxin-like activity in pulp and paper mill black liquor and effluent using in vitro bioassays  

SciTech Connect (OSTI)

Pulp and paper mill effluent contains a complex mixture of compounds which adversely affect fish physiologically and at the population level. These effects include compromised reproductive fitness and the induction of mixed-function oxidase activities; two classic responses mediated by the estrogen and/or Ah receptor. In vitro recombinant receptor/reporter gene assays were used to examine pulp and paper mill black liquor and effluent for estrogenic, dioxin-like and antiestrogenic activities. Using MCF7 cells transiently transfected with a Gal4-estrogen receptor chimeric construct (Gal4-HEGO) and a Gal4-regulated luciferase reporter gene (17m5-G-Luc), it was estimated that black liquor contains 4 {+-} 2 ppb ``estrogen equivalents``, while negligible estrogenic activity was observed in a methanol-extracted pulp and paper mill effluent fraction (MF). A dioxin response element (DRE)-regulated luciferase reporter gene (pGudLucl.1) transiently transfected into Hepalclc7 wild type cells exhibited a dose-dependent increase in luciferase activity following treatment with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDO), black liquor and MF. Based on the dose response curves, black liquor and MF contain 10 {+-} 4 ppb and 20 {+-} 6 ppt ``TCDD equivalents``, respectively. Moreover, MF exhibited significant AhR-mediated antiestrogenic activity. These results demonstrate the utility of these bioassays and suggest that the effects observed in fish exposed to pulp and paper mill effluent may be due to unidentified ER and AhR ligands not detected by conventional chemical analysis due to the lack of appropriate chemical standards.

Zacharewski, T.; Berhane, K.; Gillesby, B.; Burnison, K. [Univ. of Western Ontario, London, Ontario (Canada). Dept. of Pharmacology and Toxicology; [National Water Research Inst., Burlington, Ontario (Canada). Aquatic Ecosystem Conservation Branch

1995-12-31T23:59:59.000Z

190

Offered: Offered: Position(s): Position(s)  

E-Print Network [OSTI]

Center Verso Paper Bachelors Electrical, Mechanical and Chemical engineers will be performing process: Description: Paid/Unpaid: When: Hire International Students: Electrical, Mechanical and Chemical engineers. It is a 2,000 ton/day, fully-integrated mill with four paper machines, a pulp machine, two kraft pulp lines

New Hampshire, University of

191

Carbon emissions reduction potential in the US chemicals and pulp and paper industries by applying CHP technologies  

SciTech Connect (OSTI)

The chemical and the pulp/paper industries combined provide 55% of CHP generation in the US industry. Yet, significant potential for new CHP capacities exists in both industries. From the present steam consumption data, the authors estimate about 50 GW of additional technical potential for CHP in both industries. The reduced carbon emissions will be equivalent to 44% of the present carbon emissions in these industries. They find that most of the carbon emissions reductions can be achieved at negative costs. Depending on the assumptions used in calculations, the economic potential of CHP in these industries can be significantly lower, and carbon emissions mitigation costs can be much higher. Using sensitivity analyses, they determine that the largest effect on the CHP estimate have the assumptions in the costs of CHP technology, in the assumed discount rates, in improvements in efficiency of CHP technologies, and in the CHP equipment depreciation periods. Changes in fuel and electricity prices and the growth in the industries' steam demand have less of an effect. They conclude that the lowest carbon mitigation costs are achieved with the CHP facility is operated by the utility and when industrial company that owns the CHP unit can sell extra electricity and steam to the open wholesale market. Based on the results of the analyses they discuss policy implications.

Khrushch, M.; Worrell, E.; Price, L.; Martin, N.; Einstein, D.

1999-07-01T23:59:59.000Z

192

The Adaptive Hypothesis of Bleaching  

E-Print Network [OSTI]

over a wide range of light levels ranging from direct exposure to full sunlight in intertidal corals, air and land (Smith and Buddemeier 1992), and reef communities have persisted over geological time through significant climate and sea-level fluctuations. Despite this, rates of speciation and extinction

Miami, University of

193

Overcoming the Recalcitrance of Cellulosic Biomass by Value Prior to Pulping: Cooperative Research and Development Final Report, CRADA Number CRD-07-221  

SciTech Connect (OSTI)

The Value Prior to Pulping (VPP) project goal was to demonstrate the technical and commercial feasibility of introducing a new value stream into existing pulp and paper mills. Essentially the intent was to transfer the energy content of extracted hemicellulose from electricity and steam generated in the recovery boiler to a liquid transportation fuel. The hemicellulose fraction was extracted prior to pulping, fractionated, or conditioned if necessary, and fermented to ethanol. Commercial adaptation of the process to wood hemicelluloses was a prerequisite for using this less currently valued component available from biomass and wood. These hemicelluloses are predominately glucurono-xylan in hardwoods and galactoglucomannan in softwoods (with a significant softwood component of an arabino-xylan) and will yield fermentation substrates different from cellulose. NREL provided its expertise in the area of fermentation host evaluation using its Zymomonas strains on the CleanTech Partner's (CTP) VPP project. The project was focused on the production of fuel ethanol and acetic acid from hemicellulose streams generated from wood chips of industrially important hardwood and softwood species. NREL was one of four partners whose ethanologen was tested on the hydrolyzed extracts. The use of commercially available enzymes to treat oligomeric sugar extracts was also investigated and coupled with fermentation. Fermentations by NREL were conducted with the Zymomonas mobilis organism with most of the work being performed with the 8b strain. The wood extracts hydrolyzed and/or fermented by NREL were those derived from maple, mixed southern hardwoods, and loblolly pine. An unhydrolyzed variant of the mixed southern hardwood extract possessed a large concentration of oligomeric sugars and enzymatic hydrolysis was performed with a number of enzymes, followed by fermentation. The fermentation of the wood extracts was carried out at bench scale in flasks or small bioreactors, with a maximum volume of 500 mL.

Lowell, A.

2012-04-01T23:59:59.000Z

194

Materials selection for kraft batch digesters  

SciTech Connect (OSTI)

Several candidate materials were evaluated by corrosion testing in autoclaves containing white and black liquors for batch digesters. The relationship between corrosion rate and corrosion potential was determined for ASTM SA516-Grade 70 carbon steel, UNS S30403 (Type 304L) austenitic stainless steel, UNS S31803 (2205) and UNS S32550 (2605) duplex stainless steels, and two stainless steel weld overlays, applied by the GMAW (gas metal arc welding) and SAW (submerged arc welding) processes. The tests revealed that SA516-Grade 70 carbon steel and type 304L stainless steel can experience high rates of corrosion. For the duplex stainless steels and weld overlays, corrosion resistance improved with chromium content. A chromium content of at least 25% was found to be necessary for good corrosion resistance.

Wensley, A. [Bacon Donaldson Consulting Engineers, Richmond, British Columbia (Canada); Moskal, M. [Stone Container Corp., Burr Ridge, IL (United States); Wilton, W. [Stone-Consolidated Corp., Fort Frances, Ontario (Canada)

1997-08-01T23:59:59.000Z

195

Char reactions during kraft black liquor pyrolysis  

SciTech Connect (OSTI)

The pyrolysis characteristics of dried black liquor particles were investigated at high heating rates in a laminar entrained-flow reactor at temperatures of 600-1100{degrees}C. Primary pyrolysis of the organic fraction occurred very rapidly, in less 0.5 seconds. Char yields at the end or volatiles evolution were 58-72%. The decreased with increasing reactor temperature to 900{degrees}C but remained constant at higher temperatures. 35-65% of the fuel nitrogen was volatilized, nearly all in less than 0.5 s. Relatively little fuel nitrogen was evolved from the char. Significant alkali metal chloride volatization from the char occurred at all temperatures, while additional sodium volatilization became important above 900{degrees}C. Reduction of sulfur species in the char increased rapidly with increasing temperature. A temperature-dependent delay time in the onset of Na{sub 2}S formation was observed.

Frederick, W.J.; Sricharoenchaikul, V.; Reis, V.V. [Oregon State Univ., Corvallis, OR (United States)

1995-12-01T23:59:59.000Z

196

Combustion properties of Kraft Black Liquors  

SciTech Connect (OSTI)

In a previous study of the phenomena involved in the combustion of black liquor droplets a numerical model was developed. The model required certain black liquor specific combustion information which was then not currently available, and additional data were needed for evaluating the model. The overall objectives of the project reported here was to provide experimental data on key aspects of black liquor combustion, to interpret the data, and to put it into a form which would be useful for computational models for recovery boilers. The specific topics to be investigated were the volatiles and char carbon yields from pyrolysis of single black liquor droplets; a criterion for the onset of devolatilization and the accompanying rapid swelling; and the surface temperature of black liquor droplets during pyrolysis, combustion, and gasification. Additional information on the swelling characteristics of black liquor droplets was also obtained as part of the experiments conducted.

Frederick, W.J. Jr.; Hupa, M. (Aabo Akademi, Turku (Finland))

1993-04-01T23:59:59.000Z

197

X-ray Studies of Regenerated Cellulose Fibers Wet Spun from Cotton Linter Pulp in NaOH/Thiourea Aqueous Solutions  

SciTech Connect (OSTI)

Regenerated cellulose fibers were fabricated by dissolution of cotton linter pulp in NaOH (9.5 wt%) and thiourea (4.5 wt%) aqueous solution followed by wet-spinning and multi-roller drawing. The multi-roller drawing process involved three stages: coagulation (I), coagulation (II) and post-treatment (III). The crystalline structure and morphology of regenerated cellulose fiber was investigated by synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. Results indicated that only the cellulose II crystal structure was found in regenerated cellulose fibers, proving that the cellulose crystals were completely transformed from cellulose I to II structure during spinning from NaOH/thiourea aqueous solution. The crystallinity, orientation and crystal size at each stage were determined from the WAXD analysis. Drawing of cellulose fibers in the coagulation (II) bath (H{sub 2}SO{sub 4}/H{sub 2}O) was found to generate higher orientation and crystallinity than drawing in the post-treatment (III). Although the post-treatment process also increased crystal orientation, it led to a decrease in crystallinity with notable reduction in the anisotropic fraction. Compared with commercial rayon fibers fabricated by the viscose process, the regenerated cellulose fibers exhibited higher crystallinity but lower crystal orientation. SAXS results revealed a clear scattering maximum along the meridian direction in all regenerated cellulose fibers, indicating the formation of lamellar structure during spinning.

Chen,X.; Burger, C.; Fang, D.; Ruan, D.; Zhang, L.; Hsiao, B.; Chu, B.

2006-01-01T23:59:59.000Z

198

Applicability of a fog-dispersal system  

E-Print Network [OSTI]

to be considered is the air pollution from the industrial sources in the area. The condensation nuclei from these sources are considerable. The emissions from the copper smel- ter, aluminum smelter, and Kraft pulp mill in the Tacoma area include sodium sulfate...

Fourroux, Melvin Ross

1973-01-01T23:59:59.000Z

199

Total organic carbon as an indicator of wood delignification  

SciTech Connect (OSTI)

Kraft pulping experiments were performed in a 12-liter electrically heated laboratory digester to determine pulp yields and residual lignin content (kappa number) as a function of time. Samples of the pulp and the black liquor were analyzed for total organic carbon (TOC) content by oxidizing the samples in a combustion furnace and measuring the released CO/sub 2/ gravimetrically. The experimental data on TOC were correlated with kappa number and yield. Results can be explained satisfactorily using a mathematical model based upon the principle of conservation of mass. The TOC content of black liquor appears to be a useful parameter for batch digester control. 17 references.

Genco, J.M.; Hassler, J.C.; Busayasakul, N.

1984-07-01T23:59:59.000Z

200

Self bleaching photoelectrochemical-electrochromic device  

DOE Patents [OSTI]

A photoelectrochemical-electrochromic device comprising a first transparent electrode and a second transparent electrode in parallel, spaced relation to each other. The first transparent electrode is electrically connected to the second transparent electrode. An electrochromic material is applied to the first transparent electrode and a nanoporous semiconductor film having a dye adsorbed therein is applied to the second transparent electrode. An electrolyte layer contacts the electrochromic material and the nanoporous semiconductor film. The electrolyte layer has a redox couple whereby upon application of light, the nanoporous semiconductor layer dye absorbs the light and the redox couple oxidizes producing an electric field across the device modulating the effective light transmittance through the device.

Bechinger, Clemens S. (Konstanz, DE); Gregg, Brian A. (Golden, CO)

2002-04-09T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Skin Bleaching in Jamaica: A Colonial Legacy  

E-Print Network [OSTI]

of Eurocentric values and a denigration of Afrocentric values in many facets of life, specifically in the promotion of light skin as an indicator of beauty and social status. The purpose of this study was to examine the psychological and socio-cultural factors...

Robinson, Petra Alaine

2012-07-16T23:59:59.000Z

202

Energy consumption in thermomechanical pulping  

SciTech Connect (OSTI)

Various components of refining energy were determined experimentally and compared with those calculated on the basis of the dimensions of morphological elements of wood. The experimentally determined fiberization energy of spruce was 6 to 60 times larger than the calculated value and that of birch 3 to 15 times larger. The energy consumed in reducing the Canadian standard freeness of isolated fibers from 500 to 150 ml was found to be approximately 1/3 of the total fiber development energy for both spruce and birch TMP. Chip size affected the refining energy consumption; the total energy dropped by approximately 30% when chip size was reduced from 16 mm to 3 mm in the case of spruce and approximately 40% for birch. 6 refs.

Marton, R.; Tsujimoto, N.; Eskelinen, E.

1981-08-01T23:59:59.000Z

203

Effektiv brug af grnne afgifter i kraft-og varmesektoren  

E-Print Network [OSTI]

gennem tilskyndelse til et lavere energiforbrug og en mere miljøvenlig energiproduktion fx ved en øget energiproduktion. Det drejer sig primært om tre styringsmidler: 1. Grønne og ikke så grønne afgifter 2

204

Thermal Behavior of Floor Tubes in a Kraft Recovery Boiler  

SciTech Connect (OSTI)

The temperatures of floor tubes in a slope-floored black liquor recovery boiler were measured using an array of thermocouples located on the tube crowns. It was found that sudden, short duration temperature increases occurred with a frequency that increased with distance from the spout wall. To determine if the temperature pulses were associated with material falling from the convective section of the boiler, the pattern of sootblower operation was recorded and compared with the pattern of temperature pulses. During the period from September, 1998, through February, 1999, it was found that more than 2/3 of the temperature pulses occurred during the time when one of the fast eight sootblowers, which are directed at the back of the screen tubes and the leading edge of the first superheater bank, was operating.

Barker, R.E.; Choudhury, K.A.; Gorog, J.P.; Hall, L.M.; Keiser, J.R.; Sarma, G.B.

1999-09-12T23:59:59.000Z

205

Why Do Kraft Recovery Boiler Composite Floor Tubes Crack?  

SciTech Connect (OSTI)

Cracks were first reported in 1992 in co-extruded 304L stainless steel/SA210 Gd Al carbon steel floor tubes of North American black liquor recovery boilers. Since then, a considerable amount of information has been collected on the tube environment, crack characteristics, the stress state of the tubes, and the crack initiation and propagation mechanisms. These studies have identified both operating procedures that apparently can greatly lessen the likelihood of crack formation in the stainless steel layer and alternate materials that appear to be much more resistant to cracking than is 304L stainless.

Keiser, J.R.

2001-10-22T23:59:59.000Z

206

Vinyl Kraft Windows and Doors | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov PtyInformation UCOpenVerona,HamptonVinland, Wisconsin: Energy

207

Proceedings of the black liquor research program review fourth meeting held July 28--30, 1987  

SciTech Connect (OSTI)

Research programs, presented at the black liquor review meeting are described. Research topics include the following: Cooperative Program in Kraft Recovery; Black Liquor Physical Properties; Viscosity of Strong Black Liquor; Ultrafiltration of Kraft Black Liquor; Molecular Weight Distribution of Kraft Lignin; Black Liquor Droplet Formation Project; Fundamental Studies of Black Liquor Combustion; Black Liquor Combustion Sensors; Flash X-ray Imagining of Black Liquor Sprays; Laser Induced Fluorescence For Process Control In The Pulp and Paper Industry; Recovery Boiler Optimization; Black Liquor Gasification and Use of the Products in Combined-Cycle Cogeneration; Black Liquor Steam Plasma Automization; The B and W Pyrosonic 2000R System; Monsteras Boiler Control System; and Cooperative Program Project Reviews. Individual projects are processed separately for the data bases.

Emerson, D. B.; Whitworth, B. A.

1987-10-01T23:59:59.000Z

208

VICKERY, JOHN D. Fundamental Properties and Bond Characteristics of Chlorinated Polyvinyl Chloride and SS340 Adhesive for Evaluation of Steel Tank Linings. (Under  

E-Print Network [OSTI]

Chloride and SS340 Adhesive for Evaluation of Steel Tank Linings. (Under the Direction of Dr. Sami Rizkalla.) Tank linings are used to extend the service life of tanks and to avoid replacement of damaged tanks is to understand the behavior of the different materials proposed for lining typical bleach tanks used in the pulp

209

Energy considerations for steam plasma gasification of black liquor and chemical recovery  

SciTech Connect (OSTI)

This paper investigates the energy economics of using a hybrid steam plasma process to gasify black liquor. In the pulp and paper industry, gasification is gaining credibility as an incremental method to supplement the standard Kraft process, which bums the black liquor in large furnaces to recover energy and inorganic chemicals (sodium and sulfur) that are recycled back into the wood pulping process. This paper shows that despite the energy intensive nature of steam plasma processing, several fortuitous conditions arise that make it a viable technology for the gasification of black liquor.

Grandy, J.D.; Kong, P.C.

1995-10-01T23:59:59.000Z

210

Energy considerations for steam plasma gasification of black liquor and chemical recovery  

SciTech Connect (OSTI)

This paper investigates the energy economics of using a hybrid steam plasma process to gasify black liquor. In the pulp and paper industry, gasification is gaining credibility as an incremental method to supplement the standard Kraft process, which burns the black liquor in large furnaces to recover energy and inorganic chemicals (sodium and sulfur) that are recycled back into the wood pulping process. This paper shows that despite the energy intensive nature of steam plasma processing, several fortuitous conditions arise that make it a viable technology for the gasification of black liquor.

Grandy, J.D.; Kong, P.C. [Idaho National Engineering Lab., Idaho Falls, ID (United States)

1995-07-01T23:59:59.000Z

211

Establishment of ultraviolet absorption analysis at 2050 A as a viable indicator of delignification rate  

SciTech Connect (OSTI)

The UV absorption of diluted black liquor samples at 2050 A and the percent lignin removed from wood (Pinus strobus) during kraft pulping, when plotted against each other, produced a linear relation with a correlation coefficient of 0.961. This result indicated the viability of using UV absorption analysis of black liquor samples in the determination of reaction rate of lignin within the chip.

Bobier, W.D.; Poniatowski, S.E.; Walkinshaw, J.W.

1981-01-01T23:59:59.000Z

212

Preliminary analysis of the state of the art of robotics and precision engineering and evaluation of potential for improved energy utilization in the pulp, paper, and related energy-consuming processes. Final report  

SciTech Connect (OSTI)

This study was undertaken to conduct a preliminary analysis of the state of the art of two technologies, robotics and precision engineering, and to evaluate their potential for improved energy utilization in the pulp, paper, and related energy consuming processes. Activity in the robotics field is growing rapidly, most activity being related to the development of smart robots rather than to systems. There is a broad base of support, both in industry and the universities, for upgrading robot machine capabilities. A large part of that support is associated with visualization and tactile sensors which facilitate assembly, placement, inspection, and tracking. Progress in this area is relatively rapid and development times are short for specifically engineered applications. The critical path in the development of robotic systems lies in the generation of reliable sensor signals. Robotic systems require a broad spectrum of sensors from which hierarchical logic systems can draw decision making information. This requirement resulted in the establishment of a program at the National Bureau of Standards which is attempting to develop a spectrum of sensor capabilities. Such sensors are applicable to robotic system automatic process control in a variety of energy-intensive industries. Precision engineering is defined as the generation or manufacture of components wherein geometry, dimension, and surface finish are controlled to within several hundred Angstroms in single point turning operations. Investigation into the state of the art of precision engineering in the United States finds that this capability exists in several national laboratories and is intended to be used exclusively for the development of weapons. There is an attempt at the present time by Lawrence Livermore Laboratory to expand its capability into industry. Several corporations are now beginning to develop equipment to support the precision engineering field.

None

1982-01-01T23:59:59.000Z

213

Methane production from ozonated pulp mill effluent  

SciTech Connect (OSTI)

A study was made of the production of methane from desugared spent sulfite liquor (SSL) reacted with ozone. The ozonated SSL was fed continuously to three anaerobic fermenters for three months as the sole source of carbon and energy. The fermenters were inoculated with anaerobic bacteria obtained from sewage sludge and acclimated for 1 month in ozonated SSL prior to continuous fermentation. Chemical and biological parameters such as COD, BOD, total sulfur content, redox potential, pH, fatty acid composition, and methane bacteria populations were monitored to determine changes in the SSL during fermentation. Methane production from ozone-treated SSL averaged 1.7 liters/ liter or 17 ml of CH/sub 4/ produced/gram of volatile solids fed. Fatty acis analysis of fermenter effluent indicated a net production of 58 mM/ liter of acetate during ozonated SSL fermentation. This acetic acid production shows future potential for further fermentation by protein-producing yeast. Although the rate of conversion of volatile solids to CH/sub 4/ in this process was not competitive with domestic or agricultural waste digesters, this study did indicate the potential benefits of ozonating organic wastes for increased methane fermentation yields.

Bremmon, C.E.; Jurgensen, M.F.; Patton, J.T.

1980-07-01T23:59:59.000Z

214

DENTAL ANOMALIES I. ABNORMALITIES OF DENTAL PULP  

E-Print Network [OSTI]

, the roots of a deciduous tooth undergo resorption before the tooth exfoliates. This is a normal physiologic resorption occurs before exfoliation of tooth. Fig. 10-4 Incomplete physiologic root resorption resulting result in the exfoliation of the crown or a spontaneous fracture of the root. #12;OD17-10/2 Page 5 Fig

215

Pulp & Paper Industry Corrosion Problems: Past Dilemmas  

E-Print Network [OSTI]

Additional Materials Available 1930 Austenitic Stainless Steels 18/8 Duplex Stainless Steel, Type 329 Ni Arc Welding No Welding Yet for Stainless Steel 12 #12;11/12/2014 7 Ni-Resist Applications 1930 13 Ni Stainless Steel in 1945 GTAW, GMAW Developed Carbon Steel Welding SMAW, SAW, Oxyacetylene 21 Historical

Das, Suman

216

ORIGINAL PAPER Symbiont bleaching in fossil planktonic foraminifera  

E-Print Network [OSTI]

, this is analogous with modern species that possess an association with algal photosymbionts. Turborotalia-celled protists that shield their cytoplasm within a secreted calcareous (CaCO3) skeleton (Hemleben et al. 1989). There are several potential advantages to planktonic foraminifera harbouring algal symbionts. These endosymbionts

217

A comparison of methods of bleaching cotton-seed oil  

E-Print Network [OSTI]

~ oottonseed oil ~ Follosing are the data reported& original Color ST+elR 3$T~R 3%+xCR Rg fuller's earth 4g fuller's earth 8g fuller's earth 8g fuller's earth Xtgf fuller's earth ~++OR 80TH~ RGY-I v8R 80T-1+R RCT legR 20T&elR 80T ls8R 80T~Ie6R 80...T-XslR RCT-id@ The abov? letters refer to the yellow and red oolor glasses af the s~ Lovibond soaieo galley reports that Filtrole, a ~ silioa, is superior to 8 standard fullerxs earth axsl that it sots better at loser hssperatures than...

Hiett, Thomas Aldon

1938-01-01T23:59:59.000Z

218

Advanced mineral calciner for regeneration of lime. Final report, March 1995--May 1997  

SciTech Connect (OSTI)

There are approximately 800 pulp, paper and paperboard mills in the United States. Pulp and paper is the ninth largest industry in US, uses 2.8 quads of energy per year and ranks third among all domestic US industries in the cost of energy consumed. A significant fraction of the energy consumed in pulp and paper plants is needed to recover chemicals that are used in breaking down the wood chips into pulp. In particular, 0.1 quads of energy per year are used to regenerate lime. Furthermore, pulp and paper plant operations generate 9,870 tons of NOx per year. Additionally over two million tons of spent lime are sent to landfills each year. In addition, growth in paper demand and changes in plant processes (e.g., bleaching), as a result of environmental pressures, will continue to drive the need for more lime regeneration capacity. Unless the increased capacity can be delivered productively and inexpensively, the growth in pulp and paper may occur in overseas markets. Furthermore, if new environmental constraints cannot be met at low cost, existing US pulp and paper production capacity may also move off-shore. The advanced mineral calciner (AMC) technology was developed to address this lime regeneration need. Prior to describing the technology, and the program of work that was used to test the concept, conventional lime regeneration systems and their limitations are described.

Namazian, M.; Nickeson, R.; Lovas, B.; Miller, G.; Kelly, J.

1997-12-31T23:59:59.000Z

219

National Dioxin Study Tier 4 - combustion sources: final test report - Site 8, Black-liquor boiler BLB-C  

SciTech Connect (OSTI)

This report summarizes the results of a dioxin/furan emissions test of a black-liquor recovery boiler equipped with a drybottom electrostatic precipitator for particulate emissions control. Black-liquor recovery boilers are used at kraft pulp mills to produce process steam and to reclaim inorganic chemicals from spent wood pulping liquors. The dioxin/furan emissions test was conducted under Tier 4 of the National Dioxin Study. The primary objective of Tier 4 is to determine if various combustion sources are sources of dioxin and/or furan emissions. If any of the combustion sources are found to emit dioxin or furan, the secondary objective of Tier 4 is to quantify these emissions. Black-liquor recovery boilers are one of 8 combustion-source categories that have been tested in the Tier 4 program. The tested black-liquor boiler, BLB-C, was selected for the test after an initial information screening and a one-day pretest survey visit. Boiler BLB-C is considered representative of black-liquor recovery boilers with dry-bottom electrostatic precipitators. The amount of chloride present in the black-liquor circuit at this site is considered intermediate to high relative to that found at other kraft pulp mills. Data presented in the report include dioxin (tetra through octa homologue +2378 TCDD) and furan (tetra through octa homologue +2378 TCDF) results for both stack samples and ash samples. In addition, process data collected during sampling are also presented.

Jamgochian, C.L.; Keller, L.E.

1987-04-01T23:59:59.000Z

220

Ultrafiltration. (Latest citations from the NTIS bibliographic database). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations concerning ultrafiltration, the separation of colloids or fine solid materials by filtration through microporous or semi-permeable materials. Citations discuss the use of the ultrafiltration process for removing dissolved toxic metals from groundwater, production of food-grade protein, treating kraft black liquor from pulp and paper processing, decontamination of low-level radioactive waste water, desalination, and hemodialysis. Topics also include ultrafiltration equipment and membrane descriptions. Procedures for preventing fouling and the cleaning of the filtration materials and membranes are also presented. (Contains a minimum of 133 citations and includes a subject term index and title list.)

Not Available

1994-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Ultrafiltration. (Latest citations from the NTIS Bibliographic database). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations concerning ultrafiltration, the separation of colloids or fine solid materials by filtration through microporous or semi-permeable materials. Citations discuss the use of the ultrafiltration process for removing dissolved toxic metals from groundwater, production of food-grade protein, treating kraft black liquor from pulp and paper processing, decontamination of low-level radioactive waste water, desalination, and hemodialysis. Topics also include ultrafiltration equipment and membrane descriptions. Procedures for preventing fouling and the cleaning of the filtration materials and membranes are also presented. (Contains a minimum of 116 citations and includes a subject term index and title list.)

Not Available

1993-12-01T23:59:59.000Z

222

Ultrafiltration. (Latest citations from the NTIS bibliographic database). Published Search  

SciTech Connect (OSTI)

The bibliography contains citations concerning ultrafiltration, the separation of colloids or fine solid materials by filtration through microporous or semi-permeable materials. Citations discuss the use of the ultrafiltration process for removing dissolved toxic metals from groundwater, production of food-grade protein, treating kraft black liquor from pulp and paper processing, decontamination of low-level radioactive waste water, desalination, and hemodialysis. Topics also include ultrafiltration equipment and membrane descriptions. Procedures for preventing fouling and the cleaning of the filtration materials and membranes are also presented. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1995-12-01T23:59:59.000Z

223

Process for producing peracids from aliphatic hydroxy carboxylic acids  

SciTech Connect (OSTI)

This patent describes a wood pulp processing system of the type producing both pulp and a stream of lactic acid-containing black liquor solution, the processor for production of peracid bleaching agents from hydroxy acid contained in the black liquor solution, comprising: adjusting the pH of the black liquor solution to the range of about 8-9 by exposing the solution to CO/sub 2/ carbon dioxide to form an alkaline precipitate; separating solids from the black liquor solution to produce a residual solution containing lower aliphatic hydroxy acids selected from the group consisting of lactic acid, glycolic acid, 2-hydroxybutanoic acid, xyloisosaccharinic acid, and glucoisosaccharinic acid; decarboxylating the lower aliphatic hydroxy acids to corresponding gaseous aliphatic aldehydes by admixing a powdered semiconductor with the residual solution to form a slurry; removing the gaseous aldehydes from the residual solution by sweeping gas flow as soon as they are generated to prevent further oxidation to carboxylic acids; reacting the gaseous aldehydes with oxygen to form corresponding peracids; and applying the peracids as bleaching agents to the pulp produced in the pulp processing system.

Chum, H.L.; Ratcliff, M.A.; Palasz, P.D.

1986-10-14T23:59:59.000Z

224

Development and applications of pyrene-containing fluorescent probes for monitoring the photodegradation of lignin-rich products  

SciTech Connect (OSTI)

o-Quinone moieties produced by irradiation of lignin-rich pulp and paper have been selectively derivatized with pyrene moieties following reaction with P(III) compounds. The results of spectroscopic and time resolved emission studies indicate that the tendency for quinone formation upon UV irradiation is enhanced by bleaching processes, specially by oxidative peroxide treatment. In steady state spectroscopic studies pulp fluorescence interferes with excimer emission. However, pulp fluorescence is a very short-lived process (t {le} 2 ns), and thus time-resolved spectroscopy can differentiate the two processes readily. These studies show some excimer fluorescence, even under conditions of very low pyrene incorporation. This suggests that o-quinone formation occurs in domains or islands, indicating that degradation occurs predominantly in some regions, or that oxidative degradation processes promote further degradation, perhaps by enhancing oxygen permeability. Fluorescence microscopy studies suggest preferential degradation in fines and fragmented fibers. 14 refs., 12 figs.

Konya, K.G.; Scaiano, J.C. [Univ. of Ottawa, Ontario (Canada)

1994-12-01T23:59:59.000Z

225

Production of Lignin-Based Phenolic Resins Using De-Polymerized Kraft Lignin and Process Optimization.  

E-Print Network [OSTI]

??Commercialization of Lignin-based phenol formaldehyde resins (LPF) has been limited due to the increase in curing temperatures and decrease in adhesive strength of LPF compared… (more)

Siddiqui, Homaira

2013-01-01T23:59:59.000Z

226

Determination of absolute molecular mass distribution and other structural properties of kraft lignin samples.  

E-Print Network [OSTI]

?? Lignin is an aromatic macromolecule present in wood and also a by-product in the process of making paper. For a long time, this by-product… (more)

Chedid, Fadia

2010-01-01T23:59:59.000Z

227

KRAFT: Supporting Virtual Organisations through Knowledge Fusion Alun Preece, Kit Hui & Peter Gray  

E-Print Network [OSTI]

organisations enable partner companies to develop and manufacture customised products with low costs and rapid. Introduction One of the most promising areas of electronic commerce (e-commerce) is improved management as a knowledge exchange medium, and show how constraint fusion supports the design of customised products

Preece, Alun

228

Black liquor gasifier/gas turbine cogeneration  

SciTech Connect (OSTI)

The kraft process dominates pulp and paper production worldwide. Black liquor, a mixture of lignin and inorganic chemicals, is generated in this process as fiber is extracted from wood. At most kraft mills today, black liquor is burned in Tomlinson boilers to produce steam for on-site heat and power and to recover the inorganic chemicals for reuse in the process. Globally, the black liquor generation rate is about 85,000 MW{sub fuel} (or 0.5 million tonnes of dry solids per day), with nearly 50% of this in North America. The majority of presently installed Tomlinson boilers will reach the end of their useful lives during the next 5 to 20 years. As a replacement for Tomlinson-based cogeneration, black liquor-gasifier/gas turbine cogeneration promises higher electrical efficiency, with prospective environmental, safety, and capital cost benefits for kraft mills. Several companies are pursuing commercialization of black liquor gasification for gas turbine applications. This paper presents results of detailed performance modeling of gasifier/gas turbine cogeneration systems using different black liquor gasifiers modeled on proposed commercial designs.

Consonni, S. [Politecnico di Milano (Italy). Dept. di Energetica; Larson, E.D.; Keutz, T.G. [Princeton Univ., NJ (United States); Berglin, N. [Chalmers Univ. of Technology, Goteborg (Sweden). Dept. of Heat and Power Technology

1998-07-01T23:59:59.000Z

229

Black liquor combustion validated recovery boiler modeling: Final year report. Volume 2 (Appendices I, section 5 and II, section 1)  

SciTech Connect (OSTI)

This project was initiated in October 1990, with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. The key tasks to be accomplished were as follows: (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes. (2) Validate the enhanced furnace models, so that users can have confidence in the predicted results. (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler. (4) Facilitate the transfer of codes, black liquid submodels, and fundamental knowledge to the US kraft pulp industry. Volume 2 contains the last section of Appendix I, Radiative heat transfer in kraft recovery boilers, and the first section of Appendix II, The effect of temperature and residence time on the distribution of carbon, sulfur, and nitrogen between gaseous and condensed phase products from low temperature pyrolysis of kraft black liquor.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

230

Black liquor combustion validated recovery boiler modeling: Final year report. Volume 1 (Main text and Appendix I, sections 1--4)  

SciTech Connect (OSTI)

This project was initiated in October 1990, with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. The key tasks to be accomplished were as follows: (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes. (2) Validate the enhanced furnace models, so that users can have confidence in the predicted results. (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler. (4) Facilitate the transfer of codes, black liquid submodels, and fundamental knowledge to the US kraft pulp industry. Volume 1 contains the main body of the report and the first 4 sections of Appendix 1: Modeling of black liquor recovery boilers -- summary report; Flow and heat transfer modeling in the upper furnace of a kraft recovery boiler; Numerical simulation of black liquor combustion; and Investigation of turbulence models and prediction of swirling flows for kraft recovery furnaces.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

231

Alternatives for balanced production of fibers, chemicals, and energy from wood  

SciTech Connect (OSTI)

Increased oil prices and shortage of fossil materials have recently focused interest on the possibilities of conversion of wood to various forms of fuels and chemicals. It is to be expected that new approaches are emerging from the totality of the research effort now in progress. However, irrespective of this, the function of wood as a construction material and a source for fibers presumably remains unchanged or even becomes more important in the future. In regard to the principal pulping methods for production of fibers, no abrupt changes in current practices are probable, apart from important progress in energy saving. In a very favorable situation of the kraft process, when surplus energy generated from the burning of black liquor is availiable, a partial recovery of dissolved organic solids, such as lignin and carbohydrates and their degradation products, becomes more attractive. Quite different is the case of the conventional sulfite process when evaporation and burning of the spent liquor result in severe air pollution. Successful recovery, conversion, and marketing of the dissolved solids can then be the only way to compensate for the expense of using external fuel. Alternatives for production of organic chemicals from kraft and sulfite spent liquors are discussed by taking into consideration the fiber production, composition of dissolved solids, energy requirements, pollution problems, and recovery of inorganic pulping chemicals. 11 references, 10 figures, 5 tables

Sjoestroem, E.

1983-01-01T23:59:59.000Z

232

Vapor pressure and boiling point elevation of slash pine black liquors: Predictive models with statistical approach  

SciTech Connect (OSTI)

Vapor-liquid equilibria and boiling point elevation of slash pine kraft black liquors over a wide range of solid concentrations (up to 85% solids) has been studied. The liquors are from a statistically designed pulping experiment for pulping slash pine in a pilot scale digester with four cooking variables of effective alkali, sulfidity, cooking time, and cooking temperature. It was found that boiling point elevation of black liquors is pressure dependent, and this dependency is more significant at higher solids concentrations. The boiling point elevation data at different solids contents (at a fixed pressure) were correlated to the dissolved solids (S/(1 {minus} S)) in black liquor. Due to the solubility limit of some of the salts in black liquor, a change in the slope of the boiling point elevation as a function of the dissolved solids was observed at a concentration of around 65% solids. An empirical method was developed to describe the boiling point elevation of each liquor as a function of pressure and solids mass fraction. The boiling point elevation of slash pine black liquors was correlated quantitatively to the pulping variables, using different statistical procedures. These predictive models can be applied to determine the boiling point rise (and boiling point) of slash pine black liquors at processing conditions from the knowledge of pulping variables. The results are presented, and their utility is discussed.

Zaman, A.A.; McNally, T.W.; Fricke, A.L. [Univ. of Florida, Gainesville, FL (United States)] [Univ. of Florida, Gainesville, FL (United States)

1998-01-01T23:59:59.000Z

233

aspen pulp mill: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 161 Clean Air Act Requirements: Uranium Mill Tailings Environmental Sciences and Ecology Websites Summary: :www.epa.govradiation...

234

Magnet options for sensors for the pulp and paper industry  

E-Print Network [OSTI]

constituents of the black liquor leaving the paper digester,a papermaking machine. The black liquor left over from themoisture content of the black liquor leaving the digester,

Green, M.A.

2011-01-01T23:59:59.000Z

235

Magnet options for sensors for the pulp and paper industry  

E-Print Network [OSTI]

the lignin and moisture content of the black liquor leavingof lignin and other constituents was measured black liquorlignin and cellulose that are dissolved in the black liquor.

Green, M.A.

2011-01-01T23:59:59.000Z

236

alkaline pulping processes: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Paper Industry Texas A&M University - TxSpace Summary: dryer hood waste heat. o Biomass feedstocks for the production of specialized chemial products. o Crossing of the stone...

237

Advanced sensor development program for the pulp and paper industry  

SciTech Connect (OSTI)

This report describes experimental and theoretical studies toward development of a remote sensing technique for non-intrusive temperature measurement based on optical spectroscopic analysis of recovery boiler. The overall objectives were (a) construction of a fiber-optic system for measurement of spectroscopic emission intensities at several wavelengths and (b) development of a computer program relating these intensities to temperatures of the emitting species. The emitting species for temperature measurements in flames can be either naturally occurring free radicals (OH, CH, C{sub 2}) or atoms which, in turn, can be either naturally occurring or seeded into flames. Sodium atoms, the obvious emitters in recovery boilers, are not promising as thermometric species because of their high concentration. At high concentrations, strong self-absorption results cause optical depths to be much smaller than the sampling depths desired for recovery boilers. An experimental program was, therefore, undertaken with the objective of identification and spectroscopic detection and measurement of other naturally occurring thermometric species. The program consisted of several laboratory studies and four field trips to different recovery boilers. 19 refs., 43 figs., 8 tabs.

Allen, J.D.; Charagundla, S.R.; Macek, A.; Semerjian, H.G.; Whetstone, J.R.

1990-10-01T23:59:59.000Z

238

The preparation and analysis of ammonia base sulfite pulping liquor  

E-Print Network [OSTI]

NH3 Concentrations . . . . . , ~ . ~ . . ~ ~ . ~ q IV The Distribution of S02 in a 2. 82$ RR3 Solution for Various Total SO2 Concentrations . . . . . . , . . . ~ . . . 31 FIGURES l. Variation of pH with Percent NH3 in Solution. . . . . ~. . . 25... 2. Variation of pH with S02 Concentration in Solutions of Various NH Concentrations . . . . ~ . . . ~ . ~ o ~ . o . ~ 27 3 ~ Composition of Solutions to give a Constant pH of T and 2. 5 , ~ 2Q 4. The Variation of the Ratio of Free S02 to Total SO2...

Honstead, John Frederick

1950-01-01T23:59:59.000Z

239

Optimizing Aeration in Pulp Mill Secondary Treatment Systems  

E-Print Network [OSTI]

With better spill control and lower carbon loads to the treatment system, there is excess aeration occurring at the lagoon. This leads to unnecessary power costs, especially during peak demand summer periods. A study was conducted to determine...

Mahmood, T.; Banerjee, S.; Welsh, J. T.; Sackellares, R. W.

240

Pulp and Paper Mills: Profiting from Efficient Motor System Use |  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Careerlumens_placard-green.epsEnergy1.pdfMarket37963 Vol. 79,Department of Energy 2-page fact

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Steam System Opportunity Assessment for the Pulp and Paper, Chemical  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarlyEnergyDepartment of Energy U.S.Improve Emitter4-01 ADMINISTRATIVEbrief details

242

The Response of Developing Island Economies to Coral1 Bleaching Events2  

E-Print Network [OSTI]

and GDP as a whole, as well as the reef specific activities of tourism and fishing, and find evidence tems per unit area (Wilkinson, 2002) with tremendous local as well as regional economic21 importance% of their energy requirements and give coral the bright colors that draw27 tourists (Glynn, 1993; Hoegh

Bauer, Dana Marie

243

Bleaching of F-centers in sodium chloride at room temperature by electron tunneling  

E-Print Network [OSTI]

, ronhot, o- met, er f LL', ali 1161ido crvs~&1? shat have been exposed tc io1Q. cinT radia bioni snch as z "aPJi MkiLbit absorption bands in the visible and near ultraviolet, which sm attributed to "color centers" crested in the orris...'-sls by the radiation. The caLm' centew consisb of various combi- nations of pvsitiv'c and, no@at, ive ion-vacancies with electrons and electron holes i hose with which She present, work is concei'ned are shown in H. g. 1. below. The F-center is a negative ion...

Carroll, Herbert Burnett

1967-01-01T23:59:59.000Z

244

Nonlinear bleaching, absorption, and scattering of 532-nm-irradiated plasmonic nanoparticles  

SciTech Connect (OSTI)

Single-pulse irradiation of Au and Ag suspensions of nanospheres and nanodisks with 532-nm 4-ns pulses has identified complex optical nonlinearities while minimizing material damage. For all materials tested, we observe competition between saturable absorption (SA) and reverse SA (RSA), with RSA behavior dominating for intensities above {approx}50 MW/cm{sup 2}. Due to reduced laser damage in single-pulse experiments, the observed intrinsic nonlinear absorption coefficients are the highest reported to date for Au nanoparticles. We find size dependence to the nonlinear absorption enhancement for Au nanoparticles, peaking in magnitude for 80-nm nanospheres and falling off at larger sizes. The nonlinear absorption coefficients for Au and Ag spheres are comparable in magnitude. On the other hand, the nonlinear absorption for Ag disks, when corrected for volume fraction, is several times higher. These trends in nonlinear absorption are correlated to local electric field enhancement through quasi-static mean-field theory. Through variable size aperture measurements, we also separate nonlinear scattering from nonlinear absorption. For all materials tested, we find that nonlinear scattering is highly directional and that its magnitude is comparable to that of nonlinear absorption. These results indicate methods to improve the efficacy of plasmonic nanoparticles as optical limiters in pulsed laser systems.

Liberman, V.; Sworin, M.; Kingsborough, R. P.; Geurtsen, G. P.; Rothschild, M. [Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, Massachusetts 02420 (United States)

2013-02-07T23:59:59.000Z

245

Review: Business and Environmental Policy: Corporate Interests in the American Political System, by Michael E. Kraft and Sheldon Kamieniecki (eds.)  

E-Print Network [OSTI]

Business and Environmental Policy: Corporate Interests ineds). Business and Environmental Policy: Corporate Interestsalso holds in the environmental policy-making realm and many

Meij, Jan-Martin

2008-01-01T23:59:59.000Z

246

Nr. 60 / 13 vom 12. August 2013 Satzung zur nderung der  

E-Print Network [OSTI]

Ă?nderungssatzung tritt zum 01. Oktober 2013 in Kraft. Artikel I Nr. 1 tritt bereits zum 01. Juni 2013 in Kraft. Sie

Noé, Reinhold

247

ber die Erhebung von Gebhren fr den Masterstudiengang  

E-Print Network [OSTI]

-Kraft-Treten 1 Diese Satzung tritt mit Wirkung vom 1. Juli 2008 in Kraft. 2 Gleichzeitig tritt die Satzung ĂĽber

Hofmann, Martin

248

Black liquor combustion validated recovery boiler modeling: Final year report. Volume 4 (Appendix IV)  

SciTech Connect (OSTI)

This project was initiated in October 1990, with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. The key tasks to be accomplished were as follows: (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes. (2) Validate the enhanced furnace models, so that users can have confidence in the predicted results. (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler. (4) Facilitate the transfer of codes, black liquid submodels, and fundamental knowledge to the US kraft pulp industry. Volume 4 contains the following appendix sections: Radiative heat transfer properties for black liquor combustion -- Facilities and techniques and Spectral absorbance and emittance data; and Radiate heat transfer determination of the optical constants of ash samples from kraft recovery boilers -- Calculation procedure; Computation program; Density determination; Particle diameter determination; Optical constant data; and Uncertainty analysis.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

249

New Manufacturing Method for Paper Filler and Fiber Material  

SciTech Connect (OSTI)

The use of fillers in printing and writing papers has become a prerequisite for competing in a global market to reduce the cost of materials. Use of calcium carbonates (ranging from 18% to 30%) as filler is a common practice in the paper industry but the choices of fillers for each type of papers vary widely according to its use. The market for uncoated digital printing paper is one that continues to introduce exciting growth projections. and it is important to understand the effect that new manufacturing methods of calcium carbonates have on the energy efficiency and paper production. Research conducted under this award showed that the new fiber filler composite material has the potential to increase the paper filler content by up to 5% without losing mechanical properties. Benefits of the technology can be summarized as follows for a 1% filler increase per metric ton of paper produced: (i) production cost savings over $12, (ii) Energy savings of 100,900 btu, (iii) CO{sub 2} emission savings of 33 lbs, and additional savings for wood preparation, pulping, recovery of 203593 btu with a 46lbs of CO{sub 2} emission savings per 1% filler increase. In addition the technology has the potential to save: (i) additional $3 per ton of bleached pulp produced, (ii) bleaching energy savings of 170,000 btu, (iii) bleaching CO{sub 2} emission savings of 39 lbs, and (iv) additional savings for replacing conventional bleaching chemicals with a sustainable bleaching chemical is estimated to be 900,000 btu with a 205 lbs of CO{sub 2} emission savings per ton of bleached pulp produced. All the above translates to a estimated annual savings for a 12% filler increase of 296 trillion buts? or 51 million barrel of oil equivalent (BOE) or 13.7% of the industries energy demand. This can lead to a increase of renewable energy usage from 56% to close to 70% for the industry sector. CO{sub 2} emission of the industry at a 12% filler increase could be lowered by over 39 million tons annually. If the new technology could be implemented for bleaching process a total annual estimated energy savings potential of 64 trillion buts? or 11 million barrel of oil equivalent (BOE) equal to 3% of the paper industries energy demand could be realized. This could lead to a increase of renewable energy usage from 56% to close to 60% for the industry. CO{sub 2} emissions could be lowered by over 7.4 million tons annually. It is estimated that an installed system could also yield a 75 to 100% return of investment (ROI) rate for the capital equipment that need to be installed for the fiber filler composite manufacturing process.

Doelle, Klaus [SUNY College of Environmental Science and Forestry

2013-08-25T23:59:59.000Z

250

Gebhrenordnung der Universitt Heidelberg fr den nicht-konsekutiven Masterstudiengang  

E-Print Network [OSTI]

Satzung tritt am Tag nach ihrer Bekanntmachung im Mitteilungsblatt des Rektors in Kraft. Zugleich tritt

Heermann, Dieter W.

251

"Jean-Pierre-Miville-Preis" der Vetsuisse-Fakultt  

E-Print Network [OSTI]

ausgeschlossen. Dieses Reglement tritt mit dem Datum der Unterzeichnung durch den Stiftungsrat in Kraft

Richner, Heinz

252

Energistyrelsens workshop om  

E-Print Network [OSTI]

in February 2002 Windpower/consumption,% #12;Betydningen af at forudsige vindkraftproduktionen Vind- kraft MW

253

The case of the European Pulp and Paper IndustriesThe case of the European Pulp and Paper Industries October 2003  

E-Print Network [OSTI]

Industries October 2003 Wood-using industries and woody biomass Wood-using industries and woody biomass #12 total primary energy supply. » #12;Wood at the intersectionWood at the intersection Energy Raw material for the period 2002-2005Extrapolation for the period 2002-2005 #12;Forest ­ a growing resourceForest ­ a growing

254

Pulp Production in Fray Bentos: Uruguayan Forest Development as a Source of Diplomatic Conflict  

E-Print Network [OSTI]

Bell, Stephen. “Social Networks and Innovation in the SouthBell, Stephen. “Social Networks and Innovation in the Souththe Bell. “Social Networks and Innovation,” 7. Pintos,

Schoorl, Daniel Mateo

2012-01-01T23:59:59.000Z

255

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

and drying processes. An energy audit of the mill found thatpreheating A plant-wide energy audit of Georgia-Pacific’s

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

256

Preparation of brightness stabilization agent for lignin containing pulp from biomass pyrolysis oils  

DOE Patents [OSTI]

A process for producing a brightness stabilization mixture of water-soluble organic compounds from biomass pyrolysis oils comprising: a) size-reducing biomass material and pyrolyzing the size-reduced biomass material in a fluidized bed reactor; b) separating a char/ash component while maintaining char-pot temperatures to avoid condensation of pyrolysis vapors; c) condensing pyrolysis gases and vapors, and recovering pyrolysis oils by mixing the oils with acetone to obtain an oil-acetone mixture; d) evaporating acetone and recovering pyrolysis oils; e) extracting the pyrolysis oils with water to obtain a water extract; f) slurrying the water extract with carbon while stirring, and filtering the slurry to obtain a colorless filtrate; g) cooling the solution and stabilizing the solution against thermally-induced gelling and solidification by extraction with ethyl acetate to form an aqueous phase lower layer and an organic phase upper layer; h) discarding the upper organic layer and extracting the aqueous layer with ethyl acetate, and discarding the ethyl acetate fraction to obtain a brown-colored solution not susceptible to gelling or solidification upon heating; i) heating the solution to distill off water and other light components and concentrating a bottoms fraction comprising hydroxyacetaldehyde and other non-volatile components having high boiling points; and j) decolorizing the stabilized brown solution with activated carbon to obtain a colorless solution.

Agblevor, Foster A. (Blacksburg, VA); Besler-Guran, Serpil (Flemington, NJ)

2001-01-01T23:59:59.000Z

257

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

Industrial/Commercial Boiler Population. Report Submitted toCouncil of Industrial Boiler Owners, Burke, Virginia. [23]Assessment Case Study. Boiler Blowdown Heat Recovery Project

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

258

Pulp Production in Fray Bentos: Uruguayan Forest Development as a Source of Diplomatic Conflict  

E-Print Network [OSTI]

and Gerardo Caetano, Ed. Uruguay: Agenda 2020: Tendencias,2007. Arocena, Rodrigo. “Uruguay and the learning divide. ”195-214. Arocena, Rodrigo. “Uruguay en la nueva ola de las

Schoorl, Daniel Mateo

2012-01-01T23:59:59.000Z

259

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

usage by minimized production losses through the application of new materials and better sensor technologytechnology (Soderberg 2008; ECOTARGET 2009): Reduces fibrous raw material use Reduces energy consumption due to less fiber raw materials usage

Kong, Lingbo

2014-01-01T23:59:59.000Z

260

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

Waste. Office of Energy Efficiency and Renewable Energy,Industry. Office of Energy Efficiency and Renewable Energy,Savings. Office of Energy Efficiency and Renewable Energy,

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Rate of Industrial Conservation - Petroleum Refining, Chemicals and Pulp and Paper Manufacture  

E-Print Network [OSTI]

-31% of 1972 levels; through 1978 a 13-20% actual reduction in energy use has been achieved. 2) The additional can be realized by; 1982 by "strong action", or by 1987 by "moderate action". To date moderate action has been taken. 3) Overall energy conservation...

Prengle, H. W. Jr.; Golden, S. A.

1979-01-01T23:59:59.000Z

262

Energy conservation in black-liquor evaporator of pulp and paper industry  

SciTech Connect (OSTI)

This paper is an attempt on energy conservation in a quintuple effect evaporator used to concentrate dilute black liquor solution by raising their steam economy through the changes in the operating variables. It also describes the steam economy of the evaporator for the various feed arrangements so as to determine the ranges of the variables for which evaporation occurs profitable.

Agarwal, V.K.; Gupta, S.C. [Univ. of Roorkee (India). Dept. of Chemical Engineering

1995-12-31T23:59:59.000Z

263

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

chemicals (i.e. , black liquor) [5, 9]. Electricity is usedand other operations. Black liquor is the dominant fuel forconcentration Thick black liquor Refiner Steam Electricity

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

264

Analysis of Energy-Efficiency Opportunities for the Pulp and Paper Industry in China  

E-Print Network [OSTI]

efficiently utilize black liquor and other waste biomass forbiomass is used and black liquor is converted intoRecovery Falling film black liquor evaporation Black liquor

Kong, Lingbo

2014-01-01T23:59:59.000Z

265

Opportunities to improve energy efficiency in the U.S. pulp and paper industry  

E-Print Network [OSTI]

Benefit Assessment of Black Liquor Gasifier/Combined CycleRecovery Falling film black liquor evaporation Tampellafiring Falling film black liquor evaporation Enzyme-assisted

Worrell, Ernst; Martin, Nathan; Anglani, Norma; Einstein, Dan; Khrushch, Marta; Price, Lynn

2001-01-01T23:59:59.000Z

266

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

Department of Science, Technology and Society. Utrecht, TheDepartment of Science, Technology and Society. Utrecht, Theof Science, Technology & Society, Utrecht University,

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

267

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

2012b. M&G (Chemtex)/Novozymes commercial scale cellulosicItaly. The plant will use Novozymes enzyme technology to

Kong, Lingbo

2014-01-01T23:59:59.000Z

268

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

Assessment Saves Energy and Reduces Waste. Office of EnergyAssessment Saves Energy and Reduces Waste. Office of Energytrading, energy and materials, and waste processing.

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

269

ICT and e-Business in the Pulp, Paper and Paper  

E-Print Network [OSTI]

Berlin, Lios Geal Consultants, RAMBĂ?LL Management and Salzburg Research, based on a service contract

270

E-Print Network 3.0 - aqueous ethanol pulping Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

FROM CORN: CLEAN RENEWABLE FUEL FOR THE FUTURE, OR DRAIN ON OUR RESOURCES AND POCKETS? TAD... as ethanol from corn. When this corn ethanol is burned as a gasoline additive or...

271

E-Print Network 3.0 - acai pulp euterpe Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 The Model-based Approach to Computer-aided Medical Decision Summary: Nijmegen The Netherlands ACAI'09 - p. 12 12;Suitability Bayesian Networks Modelling objective, e... of the...

272

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

to between 2.5-3%, boiler efficiency improvements would saveand hog fuel, the efficiencies of boilers that combust theserecovery boiler, which can increase the efficiency of steam

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

273

Department of Energy Awards $2.2 Million to Save Energy in the Pulp and  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGYWomentheATLANTA, GA - U.S.Development Projects |Reserve |Education atProjects

274

ITP Forest Products: Energy and Environmental Profile of the U.S. Pulp and  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists'Montana.ProgramJulietip sheetK-4InFindingIR-2003-Transmission &50 1955 1960Paper

275

ITP Forest Products: Report for AIChE Pulp and Paper Industry Energy  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists'Montana.ProgramJulietip sheetK-4InFindingIR-2003-Transmission &50 1955

276

Bioenergy Pumps New Life into Pulp and Paper Mills | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:Year in Review: Top Five EEREDepartmentFebruary 4, 2014 Bioenergy Technologies Office

277

RSE Pulp & Chemical, LLC (Subsidiary of Red Shield Environmental, LLC) |  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Careerlumens_placard-green.epsEnergy1.pdfMarket37963American |Purpose01/05/14RPAM Training

278

Manufacturing Energy Bandwidth Studies: Chemical, Peroleum Refining, Pulp and Paer, and Iron and Steel Sectors  

E-Print Network [OSTI]

products) can theoretically result in net energy gain through exothermic processes. In the case of a net energy gain, a zero baseline would result in negative savings opportunity, a physical impossibility. Accounting for this, TM was chosen.... Thermodynamic minimum energy consumption completes the bar chart on the left. For chemicals, the TM is a negative value due to the exothermic nature of many high volume chemicals; under ideal conditions, manufacturing of some chemicals would generate a net...

Brueske, S.; Cresko, J.; Capenter, A.

2014-01-01T23:59:59.000Z

279

Presentation 1.2: How Brazilian pulp and paper industry faces energy challenges Mr Ludwig Moldan  

E-Print Network [OSTI]

Brazil World Source: Brazilian Energy Balance ­ 2005. Until the end of the 90's the great hydroelectric new mills adopted oil boilers. In 1970 - The first sector's energy statistical data available. THETHE of Petroleum 1% Steam Coal 3% Source: Brazilian Energy Balance ­ 2005. 49 #12; Brazil reduces oil imports

280

Analysis of Energy-Efficiency Opportunities for the Pulp and Paper Industry in China  

E-Print Network [OSTI]

and Emission Reduction Technologies. Food and AgriculturalIEA). 2009. Energy Technology Transitions for Industry -IEA). 2010. Energy Technology Perspectives - Scenarios and

Kong, Lingbo

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

Biomass Gasification Technologies for Fuels, Chemicals andEnergy, National Energy Technology Laboratory. CO ? Solution01GO10621. Industrial Technologies Progarm (ITP). 2006e.

Kong, Lingbo

2014-01-01T23:59:59.000Z

282

ENERGY EFFICIENCY OPPORTUNITIES IN THE U.S. PULP AND PAPER INDUSTRY  

E-Print Network [OSTI]

CHP) units, one steam turbine, and a steam accumulator. Theand power (CHP) Steam expansion turbines Motor Systems MotorPinch analysis Steam injected gas turbines Cogeneration of

Kramer, Klaas Jan

2010-01-01T23:59:59.000Z

283

Carbon Emissions Reduction Potential in the US Chemicals and Pulp and Paper  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartmentTie Ltd:June 20154:04-21-2014 (866) 448 - DEPOMeetingIndustries by

284

Highly Energy Efficient Directed Green Liquor Utilization (D-GLU) Pulping |  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensional Subject:Ground HawaiiWaste Heat Recovery:|Department of

285

ITP Forest Products: Energy and Environmental Profile of the U.S. Pulp and Paper Industry  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensionalthe U.S. Department ofIOWA1999) | Department2009 | UC ENERGY AND

286

ITP Forest Products: Report for AIChE Pulp and Paper Industry Energy Bandwidth Study Report  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensionalthe U.S. Department ofIOWA1999) | Department2009 | UC ENERGY

287

Appendices: Steam System Opportunity Assessment for the Pulp and Paper, Chemical Manufacturing, and Petroleum Refining Industries  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartment ofEnergy NaturalEnergy 7 ReportEnergy1999ofA:DE P A R T M E

288

Emerging Energy-Efficiency and Greenhouse Gas Mitigation Technologies for the Pulp and Paper Industry  

E-Print Network [OSTI]

pyrolysis, gasification, torrefaction, etc. ) (Stawicki andsuch as pyrolysis and torrefaction Biochemical paths Ethanol

Kong, Lingbo

2014-01-01T23:59:59.000Z

289

Detection and control of deposition on pendant tubes of Kraft chemical recovery boilers. Quarterly report for the period July-September 1999  

SciTech Connect (OSTI)

Activities during this period continued to focus on obtaining a clear image of deposits inside an operating recovery boiler.

Kychakoff, George

1999-10-01T23:59:59.000Z

290

zur nderung von Studiengangsstrukturen im Fach Informatik  

E-Print Network [OSTI]

Studierenden mehr im Diplomstudiengang Informatik immatrikuliert. § 3 Inkrafttreten 1 § 1 tritt am Tag nach der Bekanntmachung dieser Satzung in Kraft. 2 § 2 tritt mit Wirkung vom 1. Oktober 2010 in Kraft. #12;- 3

Hofmann, Martin

291

Hochschulrechenzentrum FreieUniversittBerlin  

E-Print Network [OSTI]

dieses in IT- Angelegenheiten. § 3 Inkrafttreten Diese Satzung tritt am Tage nach Veröffentlichung in den Mitteilungen der FU Berlin in Kraft. Gleichzeitig tritt die Ordnung der ZEDAT vom 08. Juli 1992 au�er Kraft

Ziegler, GĂĽnter M.

292

Gebhrenordnung der Universitt Heidelberg fr den nicht-konsekutiven Masterstudiengang  

E-Print Network [OSTI]

. § 6 Inkrafttreten Diese Satzung tritt am Tag nach ihrer Bekanntmachung im Mitteilungsblatt des Rektors in Kraft. Zugleich tritt die vom Senat am 18.11.2008 beschlossene Satzung au�er Kraft. Heidelberg, den 11

Heermann, Dieter W.

293

UniReport Satzungen und Ordnungen vom 23.Dezember 2009 1 Satzung der Johann Wolfgang Goethe-Universitt Frankfurt am Main fr die Festset-  

E-Print Network [OSTI]

Diese Satzung tritt am Tage nach ihrer Bekanntmachung im UniReport Satzungen und Ordnungen der Johann Wolfgang Goethe-Universität Frankfurt am Main in Kraft; sie tritt am 30. September 2010 au�er Kraft

Mester, Rudolf

294

Verfahrensordnung fr die Verleihung der Bezeichnung ,,auerplanmige Professorin / auerplanmiger Professor"  

E-Print Network [OSTI]

Abstimmung erfolgt geheim. § 7 In-Kraft-Treten, �bergangsregelung Die Verfahrensordnung tritt mit Verkündung in den ,,Amtlichen Bekanntmachungen der Uni- versität Rostock" in Kraft. Zu diesem Zeitpunkt tritt die

Rostock, Universität

295

Zweite Satzung zur nderung der Prfungs-und Studienordnung fr den Bachelor-und den Masterstudiengang Psychologie der Friedrich-Alexander-  

E-Print Network [OSTI]

tritt am 1. Oktober 2009 in Kraft. 2 Sie gilt für alle Studierenden, die ab dem Wintersemester 2009 bleiben davon unberührt." § 2 Diese Satzung tritt am Tag nach ihrer Bekanntmachung in Kraft. Ausgefertigt

Fiebig, Peter

296

6 M A X P L A N C K F O R S C H U N G 1 / 2 0 0 8 1 / 2 0 0 8 M A X P L A N C K F O R S C H U N G 7 FORSCHUNG AKTUELL  

E-Print Network [OSTI]

-Kraft verdankt ihren Na- men der kritischen Temperatur, nahe der sie auf- tritt. Solch eine kritische Temperatur

297

1456 Amtsblatt der Freien Hansestadt Bremen vom 17 . November 2011 Nr . 135 Diese nderung tritt nach der Genehmigung durch  

E-Print Network [OSTI]

Ă?nderung tritt nach der Genehmigung durch den Rektor mit Wirkung vom 1 . Oktober 2009 in Kraft . Sie gilt

Hoffmeister, Thomas S.

298

Fachspezifischer Teil der studiengangsspezifischen Prfungsordnung fr den Bachelorstudiengang  

E-Print Network [OSTI]

Masterzeugnisses nachgewiesen werden. § 5 In-Kraft-Treten (1) 1 Die Prüfungsordnung tritt zum 01.10.2014 in Kraft. 2 Gleichzeitig tritt die bisher geltende Prüfungsordnung au�er Kraft, Absatz 2 bleibt hiervon

Steinhoff, Heinz-JĂĽrgen

299

Black liquor combustion validated recovery boiler modeling: Final year report. Volume 3 (Appendices II, sections 2--3 and III)  

SciTech Connect (OSTI)

This project was initiated in October 1990, with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. The key tasks to be accomplished were as follows: (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes. (2) Validate the enhanced furnace models, so that users can have confidence in the predicted results. (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler. (4) Facilitate the transfer of codes, black liquid submodels, and fundamental knowledge to the US kraft pulp industry. Volume 3 contains the following appendix sections: Formation and destruction of nitrogen oxides in recovery boilers; Sintering and densification of recovery boiler deposits laboratory data and a rate model; and Experimental data on rates of particulate formation during char bed burning.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

300

Black liquor combustion validated recovery boiler modeling: Final year report. Volume 5 (Appendix V)  

SciTech Connect (OSTI)

This project was initiated in October 1990, with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. The key tasks to be accomplished were as follows: (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes. (2) Validate the enhanced furnace models, so that users can have confidence in the predicted results. (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler. (4) Facilitate the transfer of codes, black liquid submodels, and fundamental knowledge to the US kraft pulp industry. Volume 5 contains model validation simulations and comparison with data.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Controlled black liquor viscosity reduction through salting-in  

SciTech Connect (OSTI)

Black liquor viscosity increases exponentially with solids content and therefore causes processing problems for the paper industry by being a limiting factor in the Kraft pulp process. This study investigates a new approach for achieving viscosity reduction by salting-in black liquor through the addition of thiocyanate salts. These salts generally increase the solubility of the polymer constituents in black liquor, leading to a decrease in its viscosity. Several thiocyanate salts capable of reducing liquor viscosity by more than two orders of magnitude have been identified, with viscosity reduction greatest at high solids content. Salting-in of black liquor depends on the cation paired with the thiocyanate anion, as well as on solution pH and temperature. Comparative studies reveal the most effective viscosity-reducing agent of the series examined and that lignin plays an important role in the viscosity behavior of both unmodified and salted-in black liquor at high solids concentrations. These experimental findings are interpreted in terms of the underlying principles that describe salting-in and how it affects aqueous solution structure.

Roberts, J.E.; Khan, S.A.; Spontak, R.J. [North Carolina State Univ., Raleigh, NC (United States)] [North Carolina State Univ., Raleigh, NC (United States)

1996-08-01T23:59:59.000Z

302

Deconstruction of Lignin Model Compounds and Biomass-Derived Lignin using Layered Double Hydroxide Catalysts  

SciTech Connect (OSTI)

Lignin is an underutilized value stream in current biomass conversion technologies because there exist no economic and technically feasible routes for lignin depolymerization and upgrading. Base-catalyzed deconstruction (BCD) has been applied for lignin depolymerization (e.g., the Kraft process) in the pulp and paper industry for more than a century using aqueous-phase media. However, these efforts require treatment to neutralize the resulting streams, which adds significantly to the cost of lignin deconstruction. To circumvent the need for downstream treatment, here we report recent advances in the synthesis of layered double hydroxide and metal oxide catalysts to be applied to the BCD of lignin. These catalysts may prove more cost-effective than liquid-phase, non-recyclable base, and their use obviates downstream processing steps such as neutralization. Synthetic procedures for various transition-metal containing catalysts, detailed kinetics measurements using lignin model compounds, and results of the application of these catalysts to biomass-derived lignin will be presented.

Chmely, S. C.; McKinney, K. A.; Lawrence, K. R.; Sturgeon, M.; Katahira, R.; Beckham, G. T.

2013-01-01T23:59:59.000Z

303

Coliquefaction of coal and black liquor to environmentally acceptable liquid fuels  

SciTech Connect (OSTI)

Previous work in the laboratories has demonstrated that addition to lignin to coal during liquefaction significantly increases the depolymerization of coal and enhances the quality of the liquid products. It is believed that thermolysis of the lignin results in the formation of phenoxyl and other reactive radicals at temperatures too low for significant thermolysis of the coal matrix; such radicals are effective and active intermediates that depolymerize coal by cleaving methylene bridges. It has been reported that alkali is also effective for extraction of liquids from coal. The work presented here combines these two reactive agents by utilizing the black liquor waste stream from the Kraft pulping process for coal depolymerization. That waste stream contains large amounts of lignin and sodium hydroxide, as well as other components. To permit comparative evaluations of the extent of coal depolymerization by coprocessing coal and black liquor, reference runs were performed with tetralin alone, sodium hydroxide in tetralin, and lignin in tetralin. Results indicated that the sodium hydroxide-tetralin system resulted in almost 67% conversion at 375 C, 1 hour. The black liquor system exhibited a lower conversion of 60%, indicating some inhibition of the depolymerization reactions by components in the black liquor.

Kim, J. [Korea Inst. of Energy Research, Taejon (Korea, Republic of); Lalvani, S.B.; Muchmore, C.B.; Akash, B.A. [Southern Illinois Univ., Carbondale, IL (United States)

1999-11-01T23:59:59.000Z

304

E-Print Network 3.0 - affecting sodium hypochlorite Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Workshop Summary: equipment, vehicles Sodium hypochlorite (bleach) 200-500 ppm Nets, boots, clothing. Surfaces must be clean... hypochlorite solution.Note: Bleach is 5.25%...

305

Direct Causticizing for Black Liquor Gasification in a Circulating Fluidized Bed  

SciTech Connect (OSTI)

Gasification of black liquor (BLG) has distinct advantages over direct combustion in Tomlinson recovery boilers. In this project we seek to resolve causticizing issues in order to make pressurized BLG even more efficient and cost-effective. One advantage of BLG is that the inherent partial separation of sulfur and sodium during gasification lends itself to the use of proven high yield variants to conventional kraft pulping which require just such a separation. Processes such as polysulfide, split sulfidity, ASAQ, and MSSAQ can increase pulp yield from 1% to 10% over conventional kraft but require varying degrees of sulfur/sodium separation, which requires additional [and costly] processing in a conventional Tomlinson recovery process. However during gasification, the sulfur is partitioned between the gas and smelt phases, while the sodium all leaves in the smelt; thus creating the opportunity to produce sulfur-rich and sulfur-lean white liquors for specialty pulping processes. A second major incentive of BLG is the production of a combustible product gas, rich in H2 and CO. This product gas (a.k.a. “syngas”) can be used in gas turbines for combined cycle power generation (which is twice as efficient as the steam cycle alone), or it can be used as a precursor to form liquid fuels, such as dimethyl ether or Fischer Tropsh diesel. There is drawback to BLG, which has the potential to become a third major incentive if this work is successful. The causticizing load is greater for gasification of black liquor than for combustion in a Tomlinson boiler. So implementing BLG in an existing mill would require costly increases to the causticizing capacity. In situ causticizing [within the gasifier] would handle the entire causticizing load and therefore eliminate the lime cycle entirely. Previous work by the author and others has shown that titanate direct causticizing (i.e. in situ) works quite well for high-temperature BLG (950°C), but was limited to pressures below about 5 bar. It is desirable however to operate BLG at 20-30 bar for efficiency reasons related to either firing the syngas in a turbine, or catalytically forming liquid fuels. This work focused on achieving high direct causticizing yields at 20 bars pressure. The titanate direct causticizing reactions are inhibited by CO2. Previous work has shown that the partial pressure of CO2 should be kept below about 0.5 bar in order for the process to work. This translates to a total reactor pressure limit of about 5 bar for airblown BLG, and only 2 bar for O2-blown BLG. In this work a process was developed in which the CO2 partial pressure could be manipulated to a level under 0.5 bar with the total system pressure at 10 bar during O2-blown BLG. This fell short of our 20 bar goal but still represents a substantial increase in the pressure limit. A material and energy balance was performed, as well as first-pass economics based on capital and utilities costs. Compared to a reference case of using BLG with a conventional lime cycle [Larson, 2003], the IRR and NVP were estimated for further replacing the lime kiln with direct causticizing. The economics are strongly dependent on the price of lime kiln fuel. At $6/mmBTU the lime cycle is the clear choice. At $8/mmBTU the NPV is $10M with IRR of 17%. At $12/mmBTU the NPV is $45M with IRR of 36%. To further increase the total allowable pressure, the CO2 could be further decreased by further decreasing the temperature. Testing should be done at 750C. Also a small pilot should be built.

Scott Sinquefield; Xiaoyan Zeng, Alan Ball

2010-03-02T23:59:59.000Z

306

Opportunities to improve energy efficiency and reduce greenhouse gas emissions in the U.S. pulp and paper industry  

E-Print Network [OSTI]

Atlas, 1996b (? ). “Black Liquor gasification –IntroductionBerglin, N. July, 1998. Black Liquor Gasifier/Gas TurbinePreliminary Economics of Black Liquor Gasification Combined

Martin, Nathan; Anglani, N.; Einstein, D.; Khrushch, M.; Worrell, E.; Price, L.K.

2000-01-01T23:59:59.000Z

307

NEW EDITION! The most comprehensive review of international trade in wood fiber, for the pulp, MDF and biomass industries.  

E-Print Network [OSTI]

's Timber Supply Outlook 2008-2012 (www.risi.com/chinatimber) Global Tree Farm and Managed Forest Industry and biomass industries. The International Pulpwood Trade Review has long been the standard for those in the business of international trade of woodchips, pulplogs and biomass fiber. This annual report examines

308

Dry matter, yield components and pulping quality studies on four varieties of kenaf as influenced by nitrogen fertilization  

E-Print Network [OSTI]

? a i?c 7 ' dl!d -ua( ('ma Ian m, s l Table 8 Averaq. ciry matter yie. l d (kcg/ql ot) ' Tier: ~ng No. Cuba 20 31 Evergl acies 71 Guatemala 45 Nitrogen / 67 10. 40 9. 05 1 . 60 1 l ha 10. 05 B. 60 10. 13 9. 33 a --a ao Treatm nt Nean...

Idem, Nditoi Udo Akpan

1977-01-01T23:59:59.000Z

309

The South Karelia Air Pollution Study. The effects of malodorous sulfur compounds from pulp mills on respiratory and other symptoms  

SciTech Connect (OSTI)

The paper mills in South Karelia, the southeast part of Finland, are responsible for releasing a substantial amount of malodorous sulfur compounds such as hydrogen sulfide (H2S), methyl mercaptan (CH3SH), and methyl sulfides ((CH3)2S and (CH3)2S2), into ambient air. In the most polluted residential area the annual mean concentrations of hydrogen sulfide and methyl mercaptan are estimated to be 8 and 2 to 5 micrograms/m3 and the highest daily average concentration 100 and 50 micrograms/m3. The annual mean and highest daily concentrations of sulfur dioxide (SO2) are very low. We studied the effects of malodorous sulfur compounds on eye, nasal and respiratory symptoms, and headache in adults. A cross-sectional self-administered questionnaire was distributed in February 1987 and responded to by 488 adults living in a severely (n = 198), a moderately (n = 204), and a nonpolluted community (n = 86). This included questions about occurrence of the symptoms of interest during the previous 4 wk and 12 months and individual, behavioral, and other environmental determinants of the symptoms. The response rate was 83%. The odds ratios (OR) for symptoms experienced often or constantly in severely versus nonpolluted and moderately versus nonpolluted communities were estimated in logistic regression analysis controlling potential confounders. The odds ratios for eye (moderate exposure OR 11.70, Cl95% 2.33 to 58.65; severe exposure OR 11.78, Cl95% 2.35 to 59.09) and nasal symptoms (OR 2.01, Cl95% 0.97 to 4.15; OR 2.19, Cl95% 1.06 to 4.55) and cough (OR 1.89, Cl95% 0.61 to 5.86; OR 3.06, Cl95% 1.02 to 9.29) during the previous 12 months were increased, with a dose-response pattern.

Jaakkola, J.J.; Vilkka, V.; Marttila, O.; Jaeppinen, P.H.; Haahtela, T. (South Karelia Allergy and Environment Institute, Espoo (Finland))

1990-12-01T23:59:59.000Z

310

Steam System Opportunity Assessment for the Pulp and Paper, Chemical Manufacturing, and Petroleum Refining Industries: Main Report  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage » SearchEnergyDepartmentScopingOverviewFranklinStatusJ.R. Simplot Don plant

311

For more information on any of the articles in this report, contact Joshua Buck, Rachel Kraft, or Trent Perrotto in NASA's Public Affairs Office at 202-358-1100. To review NASA's other commercial space accomplishments, visit  

E-Print Network [OSTI]

to carry excessive weight all the way to orbit and back to Earth. Thus, every launch requires a brand new will surpass our original requirements." Dream Chaser hybrid motor test firing. Image courtesy of Sierra Nevada SuperDraco hot fire test. Image courtesy of SpaceX Test flight of Apollo's tower abort system. Image

312

Ordnung zur nderung der fachspezifischen Pr-fungsordnung fr den Bachelorstudiengang ,,Musik-  

E-Print Network [OSTI]

Prüfungsordnung tritt nach der Genehmi- gung durch den Rektor mit Wirkung vom 1. Oktober 2007 in Kraft. Sie wird vom 19. Dezember 2005 tritt mit dem Inkrafttreten dieser Ordnung vom 2. März 2008 au�er Kraft. (3 �nderung tritt nach der Genehmigung des Rek- tors mit Wirkung vom 1. Oktober 2007 in Kraft. Sie wird im

Hoffmeister, Thomas S.

313

Fachspezifischer Teil der studiengangsspezifischen Prfungsordnung fr den Bachelorstudiengang  

E-Print Network [OSTI]

) 1 Die PrĂĽfungsordnung tritt zum 01.10.2014 in Kraft. 2 Gleichzeitig tritt die bisher geltende PrĂĽ

Steinhoff, Heinz-JĂĽrgen

314

Zweite Satzung zur nderung der Studien-und Prfungsordnung der Universitt Stuttgart fr den Bachelorstudiengang Technisch orientierte Betriebswirtschaftslehre  

E-Print Network [OSTI]

tritt am 01. Oktober 2011 in Kraft. Abweichend hierfĂĽr tritt die Regelung unter Nr. 2 rĂĽckwirkend zum 01

Reyle, Uwe

315

E-Print Network 3.0 - action disruptive selection Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

) LESSON(S): strategic guidance of innovation projects in action; operational principles Creativity step 3 Source: Kraft, Markus - Department of Chemical Engineering, University...

316

Sun City and the Sounds of Liberation: Cultural Resistance for Social Justice in Apartheid South Africa  

E-Print Network [OSTI]

FNI Multimedia, "Sun City." Http://africanactivist.msu.edu/1985. Kraft, Scott. "Shunning Sun City: Cultural Boycott ofWhites." The Vancouver Sun, March 31, 1990. Lacey, Liam. "

Freeman, Jonathan

2014-01-01T23:59:59.000Z

317

E-Print Network 3.0 - atypical imaging findings Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Medicine 94 Categorization Theory and Research in Consumer Psychology Summary: brand image (e.g., Kraft) affect its categori zation? How will the image affect its...

318

Types of Insulation | Department of Energy  

Energy Savers [EERE]

-- into insulation systems that can include a variety of backings, such as kraft paper, plastic film, polyethylene bubbles, or cardboard, as well as thermal insulation materials....

319

Lignin as Both Fuel and Fusing Binder in Briquetted Anthracite Fines for Foundry Coke Substitute.  

E-Print Network [OSTI]

??Lignin that had been extracted from Kraft black liquor was investigated as a fusing binder in briquetted anthracite fines for a foundry coke substitute. Cupola… (more)

Lumadue, Matthew

2012-01-01T23:59:59.000Z

320

Green alternatives to toxic release inventory (TRI) chemicals in the process industry  

SciTech Connect (OSTI)

Driven by TRI reporting requirements, the chemical process industry is searching for innovative ways to reduce pollution at the source. Distinct environmental advantages of biobased green chemicals (biochemicals) mean are attractive alternatives to petrochemicals. Biochemicals are made from renewable raw materials in biological processes, such as aerobic and anaerobic fermentation, that operate at ambient temperatures and pressures, and produce only nontoxic waste products. Key TRI chemicals and several classes of commodity and intermediate compounds, used on consumer end-products manufacturing, are examined and alternatives are suggested. Specific substitution options for chlorofluorocarbons, industrial solvents, and commodity organic and inorganic chemicals are reviewed. Currently encouraged pollution prevention alternatives in the manufacturing sector are briefly examined for their long-term feasibility such as bioalternatives to bleaching in the pulp & paper industry, solvent cleaning in the electronics and dry cleaning industries, and using petroleum-based feedstocks in the plastics industry. Total life cycle and cost/benefit analyses are employed to determine whether biochemicals are environmentally feasible and commercially viable as pollution prevention tools. Currently available green chemicals along with present and projected costs and premiums are also presented. Functional compatibility of biochemicals with petrochemicals and bioprocessing systems with conventional chemical processing methods are explored. This review demonstrates that biochemicals can be used cost effectively in certain industrial chemical operations due to their added environmental benefits.

Ahmed, I.; Baron, J.; Hamilton, C. [Booz-Allen & Hamilton Inc., McLean, VA (United States)

1995-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Test method for the measurement of methanol emissions from stationary sources  

SciTech Connect (OSTI)

Methanol was designated under Title III of the Clean Air Act Amendments of 1990 as a pollutant to be regulated. A test method has been developed for the measurement of methanol emissions from stationary sources. The methanol sampling train (MST) consists of a glass-lined heated probe, two condensate knockout traps, and three sorbent cartridges packed with Anasorb 747. The Anasorb samples were desorbed with a 1:1 mixture of carbon disulfide and N,N-dimethylformamide. All samples were analyzed by gas chromatography with flame ionization detection. Following laboratory testing, field tests of the MST and the National Council of the Paper Industry for Air and Stream Improvement (NCASI) sampling method for methanol were conducted at two pulp and paper mills. In accordance with EPA Methol 301, two pairs of trains were run in parallel for six runs, collecting a total of 24 samples by each method. During each run, half of the trains were spiked with a known amount of methanol. The sampling location at the first test was an inlet vent to a softwood bleach plant scrubber where the methanol concentration was about 30 ppm. A second field test was conducted at the vent of a black liquor oxidation tank where the methanol concentration was about 350 ppm. Samples were shown to be stable for at least 2 weeks after collection.

Pate, B.A.; Peterson, M.R.; Rickman, E.E.; Jayanty, R.K.M.

1994-05-01T23:59:59.000Z

322

Black liquor viscosity reduction through salt additives: A novel environmentally benign processing alternative  

SciTech Connect (OSTI)

Processing black liquor at high solids would reduce SO{sub x} emissions, facilitate the use of non-chlorine bleaching techniques and enhance the energy efficiency of the pulping process. However, black liquor exhibits and exponential increase in viscosity as its solids content rises, thus hindering its processability in the composition range of interest (>70% solids). In this study, we present a new approach for controlling viscosity at high solids content by {open_quotes}salting in{close_quotes} black liquor through addition of thiocyanate salts. These salts increases the solubility of the polymer constituents in black liquor leading to a decrease in its viscosity. Several salts capable of viscosity reduction by as much as two orders of magnitude have been identified. The effects of cation size, solution pH and temperature on viscosity reduction is presented and interpreted in terms of the underlying principles of {open_quotes}salting in{close_quotes} and how it affects aqueous solution structure.

Roberts, J.E.; Khan, S.A.; Spontak, R.J. [North Carolina State Univ., Raleigh, NC (United States)

1996-10-01T23:59:59.000Z

323

DOEGO85004_1: Final Non-proprietary Technical Report, Generating Process and Economic Data for Preliminary Design of PureVision Biorefineries DOEGO85004_2: One Original Final Proprietary Technical Report to be mailed to DOE Golden.  

SciTech Connect (OSTI)

The overall objective of the project was to define a two-stage reactive fractionation process for converting corn stover into a solid cellulose stream and two liquid streams containing mostly hemicellulosic sugars and lignin, respectively. Toward this goal, biomass fractionation was conducted using a small continuous pilot unit with a nominal capacity of 100 pounds per day of dry biomass to generate performance data using primarily corn stover as feedstock. In the course of the program, the PureVision process was optimized for efficient hemicellulose hydrolysis in the first stage employing autohydrolysis and delignification in the second stage using sodium hydroxide as a catalyst. The remaining cellulose was deemed to be an excellent substrate for producing fermentation sugars, requiring 40% less enzymes for hydrolysis than conventional pretreatment systems using dilute acid. The fractionated cellulose was also determined to have potential higher-value applications as a pulp product. The lignin coproduct was determined to be substantially lower in molecular weight (MW) compared to lignins produced in the kraft or sulfite pulping processes. This low-MW lignin can be used as a feed and concrete binder and as an intermediate for producing a range of high-value products including phenolic resins. This research adds to the understanding of the biomass conversion area in that a new process was developed in the true spirit of biorefineries. The work completed successfully demonstrated the technical effectiveness of the process at the pilot level indicating the technology is ready to advance to a 2–3 ton per day scale. No technical showstoppers are anticipated in scaling up the PureVision fractionation process to commercial scale. Also, economic feasibility of using the PureVision process in a commercial-scale biorefinery was investigated and the minimum ethanol selling price for the PureVision process was calculated to be $0.94/gal ethanol vs. $1.07/gal ethanol for the NREL process. Thus, the PureVision process is economically attractive. Given its technical and economic feasibility, the project is of benefit to the public in the following ways: 1) it demonstrated a novel biomass fractionation process that can provide domestic supply of renewable transportation fuel from all three biomass components (cellulose, hemicellulose and lignin), 2) the lignin stream from the process has many higher-value applications beyond simply burning the lignin for energy as proposed by competing technologies, 3) it can be deployed in rural areas and create jobs in these areas, and 3) it can add to the nation’s economy and security.

Kadam, Kiran L., Ph.D; Lehrburger, Ed

2008-01-17T23:59:59.000Z

324

Black Liquor Combustion Validated Recovery Boiler Modeling, Final Year Report, Volume 5: Appendix V  

SciTech Connect (OSTI)

This project was initiated in October 1990 with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. Many of these objectives were accomplished at the end of the first five years and documented in a comprehensive report on that work (DOE/CE/40936-T3, 1996). A critical review of recovery boiler modeling, carried out in 1995, concluded that further enhancements of the model were needed to make reliable predictions of key output variables. In addition, there was a need for sufficient understanding of fouling and plugging processes to allow model outputs to be interpreted in terms of the effect on plugging and fouling. As a result, the project was restructured and reinitiated at the end of October 1995, and was completed in June 1997. The entire project is now complete and this report summarizes all of the work done on the project since it was restructured. The key tasks to be accomplished under the restructured project were to (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes; (2) Validate the enhanced furnace models, so that users can have confidence in the results; (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler; and (4) Facilitate the transfer of codes, black liquor submodels, and fundamental knowledge to the U.S. kraft pulp industry.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

325

Black Liquor Combustion Validated Recovery Boiler Modeling, Final Year Report, Volume 2: Appendix I, Section 5, and Appendix II, Section 1  

SciTech Connect (OSTI)

This project was initiated in October 1990 with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. Many of these objectives were accomplished at the end of the first five years and documented in a comprehensive report on that work (DOE/CE/40936-T3, 1996). A critical review of recovery boiler modeling, carried out in 1995, concluded that further enhancements of the model were needed to make reliable predictions of key output variables. In addition, there was a need for sufficient understanding of fouling and plugging processes to allow model outputs to be interpreted in terms of the effect on plugging and fouling. As a result, the project was restructured and reinitiated at the end of October 1995, and was completed in June 1997. The entire project is now complete and this report summarizes all of the work done on the project since it was restructured. The key tasks to be accomplished under the restructured project were to (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes; (2) Validate the enhanced furnace models, so that users can have confidence in the results; (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler; and (4) Facilitate the transfer of codes, black liquor submodels, and fundamental knowledge to the U.S. kraft pulp industry.

T.M. Grace, W.J. Frederick, M. Salcudean, R.A. Wessel

1998-08-01T23:59:59.000Z

326

Black Liquor Combustion Validated Recovery Boiler Modeling, Final Year Report, Volume 4: Appendix IV  

SciTech Connect (OSTI)

This project was initiated in October 1990 with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. Many of these objectives were accomplished at the end of the first five years and documented in a comprehensive report on that work (DOE/CE/40936-T3, 1996). A critical review of recovery boiler modeling, carried out in 1995, concluded that further enhancements of the model were needed to make reliable predictions of key output variables. In addition, there was a need for sufficient understanding of fouling and plugging processes to allow model outputs to be interpreted in terms of the effect on plugging and fouling. As a result, the project was restructured and reinitiated at the end of October 1995, and was completed in June 1997. The entire project is now complete and this report summarizes all of the work done on the project since it was restructured. The key tasks to be accomplished under the restructured project were to (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes; (2) Validate the enhanced furnace models, so that users can have confidence in the results; (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler; and (4) Facilitate the transfer of codes, black liquor submodels, and fundamental knowledge to the U.S. kraft pulp industry.

Grace, T.M.; Frederick, W.J.; Salcudean, M.; Wessel, R.A.

1998-08-01T23:59:59.000Z

327

Black Liquor Combustion Validated Recovery Boiler Modeling, Final Year Report, Volume 3: Appendix II, Sections 2 & 3 and Appendix III  

SciTech Connect (OSTI)

This project was initiated in October 1990 with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. Many of these objectives were accomplished at the end of the first five years and documented in a comprehensive report on that work (DOE/CE/40936-T3, 1996). A critical review of recovery boiler modeling, carried out in 1995, concluded that further enhancements of the model were needed to make reliable predictions of key output variables. In addition, there was a need for sufficient understanding of fouling and plugging processes to allow model outputs to be interpreted in terms of the effect on plugging and fouling. As a result, the project was restructured and reinitiated at the end of October 1995, and was completed in June 1997. The entire project is now complete and this report summarizes all of the work done on the project since it was restructured. The key tasks to be accomplished under the restructured project were to (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes; (2) Validate the enhanced furnace models, so that users can have confidence in the results; (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler; and (4) Facilitate the transfer of codes, black liquor submodels, and fundamental knowledge to the U.S. kraft pulp industry.

T.M. Grace, W.J. Frederick, M. Salcudean, R.A. Wessel

1998-08-01T23:59:59.000Z

328

Black Liquor Combustion Validated Recovery Boiler Modeling, Final Year Report, Volume 1: Main Text and Appendix I, Sections 1-4  

SciTech Connect (OSTI)

This project was initiated in October 1990 with the objective of developing and validating a new computer model of a recovery boiler furnace using a computational fluid dynamics (CFD) code specifically tailored to the requirements for solving recovery boiler flows, and using improved submodels for black liquor combustion based on continued laboratory fundamental studies. Many of these objectives were accomplished at the end of the first five years and documented in a comprehensive report on that work (DOE/CE/40936-T3, 1996). A critical review of recovery boiler modeling, carried out in 1995, concluded that further enhancements of the model were needed to make reliable predictions of key output variables. In addition, there was a need for sufficient understanding of fouling and plugging processes to allow model outputs to be interpreted in terms of the effect on plugging and fouling. As a result, the project was restructured and reinitiated at the end of October 1995, and was completed in June 1997. The entire project is now complete and this report summarizes all of the work done on the project since it was restructured. The key tasks to be accomplished under the restructured project were to (1) Complete the development of enhanced furnace models that have the capability to accurately predict carryover, emissions behavior, dust concentrations, gas temperatures, and wall heat fluxes; (2) Validate the enhanced furnace models, so that users can have confidence in the results; (3) Obtain fundamental information on aerosol formation, deposition, and hardening so as to develop the knowledge base needed to relate furnace model outputs to plugging and fouling in the convective sections of the boiler. Facilitate the transfer of codes, black liquor submodels, and fundamental knowledge to the U.S. kraft pulp industry.

T.M. Grace, W.J. Frederick, M. Salcudean, R.A. Wessel

1998-08-01T23:59:59.000Z

329

Boise Inc. St. Helens Paper Mill Achieves Significant Fuel Savings...  

Broader source: Energy.gov (indexed) [DOE]

Opportunity Assessment for the Pulp and Paper, Chemical Manufacturing, and Petroleum Refining Industries ITP Forest Products: Report for AIChE Pulp and Paper Industry Energy...

330

Highly Energy Efficient Directed Green Liquor Utilization (D...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Highly Energy Efficient Directed Green Liquor Utilization (D-GLU) Pulping Highly Energy Efficient Directed Green Liquor Utilization (D-GLU) Pulping This factsheet describes a...

331

UniReport Satzungen und Ordnungen vom 26. September 2014 1 Satzung der Johann Wolfgang Goethe-Universitt Frankfurt am Main fr die Festset-  

E-Print Network [OSTI]

. Fachsemester, gestrichen und die Zulassungszahl 107 neu festgesetzt. Artikel 2 Diese �nderung tritt am Tage-Universität Frankfurt am Main in Kraft; sie tritt am 31. März 2015 au�er Kraft. Frankfurt, den 24.09.2014 Prof. Dr

332

Gemeinsame Anordnung der Ministerien ber die Weitergeltung der Gemeinsamen Anordnung der Ministerien ber die Dienstordnung fr die Landesverwaltung Ba-  

E-Print Network [OSTI]

-WĂĽrttemberg vom 28. Dezember 2009, Az.: 1-0200.0/12, tritt mit Ab- lauf des 31.12.2012 auĂ?er Kraft. Sie wird hiermit in der bisherigen Fassung neu erlas- sen. 2. Diese Anordnung tritt am 1. Januar 2013 in Kraft und

Schindelhauer, Christian

333

Zweite Satzung zur nderung der Studienordnung fr den Studiengang Medizin  

E-Print Network [OSTI]

Ersten Abschnitt der �rztlichen Prüfung teilnehmen können." § 2 (1) Diese Satzung tritt mit Wirkung vom 1. Oktober 2003 in Kraft. (2) Abweichend von Abs. 1 tritt § 1 Nr. 1 am 1. Oktober 2005 in Kraft und findet

Hofmann, Martin

334

UniReport Satzungen und Ordnungen vom 22.08.2014 1 Satzung der Johann Wolfgang Goethe-Universitt Frankfurt am Main ber  

E-Print Network [OSTI]

Inkrafttreten Diese Satzung tritt am Tage nach ihrer VerkĂĽndung im UniReport in Kraft. Die Satzung der Johann HImmaVO tritt gleichzeitig auĂ?er Kraft. Frankfurt am Main, den 21. August 2014 Prof. Dr. Werner MĂĽller

335

10. 9 erhlt folgende Fassung: Geltungsbereich und Inkrafttreten  

E-Print Network [OSTI]

tritt nach der Ge- nehmigung des Rektors mit Wirkung vom 1. Okto- ber 2007 in Kraft. Sie wird im Amtsblatt der Freien Hansestadt Bremen veröffentlicht. Mit Inkrafttre- ten dieser Ordnung tritt die tritt nach der Genehmigung des Rektors mit Wirkung vom 1. Oktober 2007 in Kraft. Sie wird im Amtsblatt

Hoffmeister, Thomas S.

336

UniReport Satzungen und Ordnungen vom 22.06.2009 Satzung der Johann Wolfgang Goethe-Universitt Frankfurt am Main fr die Festset-  

E-Print Network [OSTI]

zu einem Sommersemester vorsehen, bleiben unberührt. § 3 Diese Satzung tritt am Tage nach ihrer in Kraft; sie tritt am 30. April 2010 au�er Kraft. Frankfurt am Main, den 16.06.2009 Prof. Dr. Werner

Mester, Rudolf

337

Nr. 39 Amtsblatt der Freien Hansestadt Bremen vom 16. Mrz 2009 345 Diese nderungsordnung nach der Genehmigung  

E-Print Network [OSTI]

tritt nach der Genehmi- gung durch den Rektor der Universität Bremen am 1. April 2009 in Kraft. Sie wird,82. § 2 Diese Bekanntmachung tritt am Tage nach ihrer Veröffentlichung in Kraft. Bremen, den 12. Februar

Hoffmeister, Thomas S.

338

Categorization Theory and Research in Consumer Psychology  

E-Print Network [OSTI]

brand image (e.g., Kraft) affect its categori zation? How will the image affect its acceptance? What, services, brands, or other marketing entities, states, or events that appear, to the consumer, related product is introduced with an existing brand name (e.g., Kraft microwave popcorn), how will the existing

Barsalou, Lawrence W.

339

2.1E BDL Summary  

E-Print Network [OSTI]

e2=.2) (e2=.2) SINGLE ELECTROCHROMIC ABSORBING B L E A C H ED / C O L O R E D SINGLE ELECTROCHROMIC REFLECTING BLEACHED/Air 705F Air DOUBLE ELECTROCHROMIC ABSORBING IG BLEACHED/

Winkelmann, F.C.

2010-01-01T23:59:59.000Z

340

Duplex Stainless Steels Margaret Gorog  

E-Print Network [OSTI]

, substituted for 6% mo SS in bleach plant Hyper DSS, Offshore oil applications Super, Hyper ­ Corrosion

Das, Suman

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Optimal Operation of Transient Processes Using Feedback Control  

E-Print Network [OSTI]

and large transitions in continuous processes such as found in petrochemical plants, the pulp and paper

Skogestad, Sigurd

342

J.F. Bruno C.E. Siddon J.D. Witman P.L. Colin M.A. Toscano  

E-Print Network [OSTI]

bleaching in Palau, Western Caroline Islands Received: 3 January 2000 / Accepted: 8 January 2001 / Published% were partially bleached. Overall, the results indicate that the 1998 coral bleaching episode in Palau Disturbance á El Nin� o á Palau á Sea surface temperature Introduction Coral reefs throughout the world

Bruno, John F.

343

Subscriber access provided by -Access paid by the | UC Irvine Libraries Environmental Science & Technology is published by the American Chemical  

E-Print Network [OSTI]

UV-light exposure, anthropogenic global warming,overpopulation,andchronicpollutionfromsewage disposalH. Introduction Coral bleaching is a global environmental problem. The most current surveys have found 52 and bleaching, it is likely that a complex interaction of causes is responsible, and bleaching is still

Barrett, Jeffrey A.

344

Sponsors of CIEEDAC: Natural Resources Canada, Canadian Industry Program for Energy Conservation, Aluminium Industry Association, Canadian Petroleum Products Institute, Canadian Portland Cement Association, Canadian Pulp  

E-Print Network [OSTI]

of REGIONAL TRENDS IN INDUSTRIAL GREENHOUSE GAS EMISSIONS, 1990 - 1996 in Canada Prepared for EnvironmentSponsors of CIEEDAC: Natural Resources Canada, Canadian Industry Program for Energy Conservation. Not for Quotation GHG Emissions, 1990 - 1996 CIEEDAC i March, 2001 Analysis of Regional Trends in Industrial

345

CRADA Final Report: Materials Development For Pulp and Paper Mills, Task 9 Proof of Commercial Concept: Commodity Carbon Fibers From Weyerhaeuser Lignin Based Fibers  

SciTech Connect (OSTI)

Tasks were assigned to Oak Ridge National Laboratory (ORNL) researchers for the development of lignin-based carbon fiber from a specific precursor that was produced by the Participant (Weyerhaeuser Corporation). These tasks included characterization of precursor polymers and fibers; and the development of conversion parameters for the fibers. ORNL researchers provided recommendations for in-house characterization of the precursor at the participant's laboratory. During the early stage of the precursor fiber production trials of various spools of fibers with varied compositions were produced. Some of those samples were sent to ORNL (by the Participant) for the development of conversion protocol. The trial tow samples were oxidized at ORNL's precursor evaluation system (PES), a bench-scale facility consisting of an oven, filament winder, tension controller, and a let off creel. The PES is a modular tool useful for the development of precursor conversion protocol. It can handle a single filament to a large single tow (50k filaments). It can also offer precise tensioning for few-filament tows. In the PES, after oxidation, fibers are typically carbonized first at low temperature, {le} 600 C, and subsequently at a higher temperature, {le} 1200 C with controlled residence time. ORNL has recently installed a new carbonization furnace with 1700 C limit and a furnace with 2500 C capacity is under installation. A protocol for the oxidation and carbonization of the trial precursor fibers was developed. Oxidized fiber with a density of 1.46 g/cc (oxidation time: 90 min) shows qualitative flame retardancy via simple flame test (fibers do not catch fire or shrink when exposed to flame). Oxidized and carbonized filaments of the Weyerhaeuser precursor fibers show moderate mechanical properties and 47-51 % carbon yield (based on oxidized fiber mass) after carbonization between 1000-1400 C. The properties of fibers from nonoptimized composition and processing parameters indicate the potential of low-cost, low-end carbon fibers based on renewable resource materials. Further work is necessary to produce high quality precursor and the corresponding carbonized filaments of superior properties.

Paulauskas, Felix L [ORNL; Naskar, Amit K [ORNL; Ozcan, Soydan [ORNL; Keiser, James R [ORNL; Gorog, John Peter [Weyerhaeuser Company

2010-09-01T23:59:59.000Z

346

Bottom-up Representation of Industrial Energy Efficiency Technologies in Integrated Assessment Models for the U.S. Pulp and Paper Sector  

E-Print Network [OSTI]

Best Practices in the Netherlands: Top Ten Energy Saving Opportunities. Proceedings COST Strategic Workshop “Improving Energy Efficiency

Xu, Tengfang

2014-01-01T23:59:59.000Z

347

Bottom-up Representation of Industrial Energy Efficiency Technologies in Integrated Assessment Models for the U.S. Pulp and Paper Sector  

E-Print Network [OSTI]

building controls, waste heat recovery or adjustable speedoptimizing ventilation) Waste heat recovery Condebelt dryingand optimizing  ventilation) Waste heat recovery Condebelt 

Xu, Tengfang

2014-01-01T23:59:59.000Z

348

Fundamental Advances in the Pulp and Paper Industry 159 AIChE Symposium Series No. 322, Vol. 95, 1999 Compatibility of Pressure Sensitive Adhesives With Recycling  

E-Print Network [OSTI]

, 1999 Compatibility of Pressure Sensitive Adhesives With Recycling Unit Operations David Bormett*, Carl) from recovered paper is a major problem facing the paper recycling industry. As a result of a United Testing and Research, paper recovery companies, paper recyclers, adhesive manufacturers, and chemical

Abubakr, Said

349

Bottom-up Representation of Industrial Energy Efficiency Technologies in Integrated Assessment Models for the U.S. Pulp and Paper Sector  

E-Print Network [OSTI]

2001. The Energy Technology Systems Analysis Programme (and Institute of Paper Science and Technology (IPST) atGeorgia Institute of Technology, Atlanta. Kramer, K. J. ,

Xu, Tengfang

2014-01-01T23:59:59.000Z

350

Generation of hydrogen peroxide in a shorted fuel cell  

SciTech Connect (OSTI)

Hydrogen peroxide is a {open_quotes}green{close_quotes} chemical with a well-assured future. As such, significant growth in demand is predicted for this material. To meet this growth, new technologies of manufacture are being contemplated to compete with the established Anthraquinone process. Some of these new methods seek the niche market of on-site generation of hydrogen peroxide. One good example of this is Dow`s caustic/peroxide generation scheme for the bleaching of paper pulp. Others rely on externally-supplied electrical power in an electrochemical reactor scheme, where peroxide may be generated additionally in neutral or acidic solution. It has long been realized that the chemical potential of the reactants themselves can be used in a controlled manner in an electrolytic cell. This is the basis of fuel cells (to generate electrical power) and has been extended to the synthesis of useful chemical species, either using solid polymer electrolytes or active oxygen transporting membranes. Use has also been made of the inherent chemical potential in H{sub 2}/O{sub 2} reactions to produce hydrogen peroxide. This reactor utilized a liquid phase cathode with dissolved air or oxygen to produce small concentrations of peroxide in a fixed volume. In fact, most schemes for the direct, electrochemical production of peroxide from hydrogen and oxygen yield low, millimolar peroxide concentrations. This paper describes the development of a scalable, segmented-flow, shorted fuel cell for the generation of greater than 1 w/o hydrogen peroxide. Three areas are of major importance in the development of a continuous, peroxide-forming reactor: the reactor design, catalyst choice and application, and the operating parameters for the reactor. The cathode catalyst is probably the single most important part. Operating parameters include such basics as temperature, pressure, gas flow rate, and liquid flow rate. Each of these topics will be discussed.

Webb, S.P.; McIntyre, J.A. [Dow Chemical Company, Midland, MI (United States)

1996-12-31T23:59:59.000Z

351

Design of Refractory Linings for Balanced Energy Efficiency, Uptime, and Capacity in Lime Kilns  

SciTech Connect (OSTI)

The rotary kilns used by the pulp and paper industry to regenerate lime in the Kraft process are very energy intensive. Throughout the 90 s, in response to increasing fuel prices, the industry used back up insulation in conjunction with the high alumina brick used to line the burning zones of their kilns. While this improved energy efficiency, the practice of installing insulating brick behind the working lining increased the inner wall temperatures. In the worst case, due to the increased temperatures, rapid brick failures occurred causing unscheduled outages and expensive repairs. Despite these issues, for the most part, the industry continued to use insulating refractory linings in that the energy savings were large enough to offset any increase in the cost of maintaining the refractory lining. Due to the dramatic decline in the price of natural gas in some areas combined with mounting pressures to increasing production of existing assets, over the last decade, many mills are focusing more on increasing the uptime of their kilns as opposed to energy savings. To this end, a growing number of mills are using basic (magnesia based) brick instead of high alumina brick to line the burning zone of the kiln since the lime mud does not react with these bricks at the operating temperatures of the burning zone of the kiln. In the extreme case, a few mills have chosen to install basic brick in the front end of the kiln running a length equivalent to 10 diameters. While the use of basic brick can increase the uptime of the kiln and reduce the cost to maintain the refractory lining, it does dramatically increase the heat losses resulting from the increased operating temperatures of the shell. Also, over long periods of time operating at these high temperatures, damage can occur in the shell. There are tradeoffs between energy efficiency, capacity and uptime. When fuel prices are very high, it makes sense to insulate the lining. When fuel prices are lower, trading some thermal efficiency for increased uptime and capacity seems reasonable. This paper considers a number of refractory linings in an effort to develop optimized operating strategies that balance these factors. In addition to considering a range of refractory materials, the paper examines other factors such as the chain area, discharge dams and other operating variables that impact the service life of the refractory lining. The paper provides recommendations that will help mill personnel develop a strategy to select a refractory lining that is optimized for their specific situation.

Gorog, John Peter [ORNL; Hemrick, James Gordon [ORNL; Walker, Harold [Refratechnik North America, Inc.; Leary, William R [ORNL; Ellis, Murray [Australian Paper, Co.

2014-01-01T23:59:59.000Z

352

Adsorption of Hydrogen Sulfide onto Activated Carbon Fibers: Effect of  

E-Print Network [OSTI]

. These processes include natural gas processing, petroleum refining, petrochemical plants, Kraft mills, coke ovens, and coal gasifiers. H2S concentrations in these processes vary from 0 to 60 vol % (6). The Claus process

Borguet, Eric

353

CX-004371: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Kapstone Kraft Paper Company #3 Paper Machine Steam Efficiency ImprovementsCX(s) Applied: B5.1Date: 11/02/2010Location(s): North CarolinaOffice(s): Energy Efficiency and Renewable Energy, National Energy Technology Laboratory

354

The Heavy Ion Fusion Science Virtual National Laboratory Collective effects of intense ion  

E-Print Network [OSTI]

, Tajima and Dawson, PRL 43, 267 (1979). Beam -plasma wake field accelerator P. Chen et al, PRL 54, 693. Robertson, PRL, 48, 149 (1982). Thin collective lens R. Kraft, Phys. Fluids, 30, 245 (1987). Thick

355

ORTH/VIM proteins that regulate DNA methylation are functional ubiquitin E3 ligases  

E-Print Network [OSTI]

ORTH/VIM proteins that regulate DNA methylation are functional ubiquitin E3 ligases Edward Kraft1 methylation status in vivo. Keywords: RING, E3 ligase, DNA methylation, ubiquitylation, ORTH/VIM, SRA

Jacobsen, Steve

356

asparaginyl endopeptidase develop: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corporations in this sector. As the main actors in the international coffee chain, companies such as Sara LeeDouwe Egberts, Nestl and Kraft have been pressurised to show...

357

alter spikelet development: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corporations in this sector. As the main actors in the international coffee chain, companies such as Sara LeeDouwe Egberts, Nestl and Kraft have been pressurised to show...

358

araneae zodariidae develop: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corporations in this sector. As the main actors in the international coffee chain, companies such as Sara LeeDouwe Egberts, Nestl and Kraft have been pressurised to show...

359

anopheles gambiae developing: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corporations in this sector. As the main actors in the international coffee chain, companies such as Sara LeeDouwe Egberts, Nestl and Kraft have been pressurised to show...

360

Zulassungsordnung der Universitt Heidelberg fr den Bachelorstudiengang  

E-Print Network [OSTI]

Immatrikulationsordnung der Universität Heidelberg unberührt. § 2 Inkrafttreten/Au�erkrafttreten Diese Satzung tritt am Tage nach ihrer Bekanntmachung im Mitteilungsblatt des Rektors in Kraft. Zugleich tritt die Satzung für

Heermann, Dieter W.

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

1/2005 Verkndungsblatt der Universitt Hannover vom 24.02.2005 Seite 43 Das Prsidium der Universitt Hannover hat auf seiner Sitzung am 26.01.2005 gem 37 Abs. 1 Nr. 5.b) NHG die  

E-Print Network [OSTI]

�nderung der Prüfungsordnung für die Studiengänge Produktion und Logistik genehmigt. Die �nderung tritt tritt rückwirkend zum Wintersemester 2004/05 in Kraft. #12;

Vollmer, Heribert

362

Freien Hansestadt Bremen 2013 Verkndet am 10. Juli 2013 Nr. 159  

E-Print Network [OSTI]

Freien Hansestadt Bremen vom 10. Juli 2013 628 (4) Mit Inkrafttreten dieser Ordnung tritt die Ă?nderung tritt nach der Genehmigung durch den Rektor mit Wirkung vom 1. Oktober 2013 in Kraft. Sie wird im

Hoffmeister, Thomas S.

363

UniReport Satzungen und Ordnungen vom 18.08.2010 1 Ordnung des Fachbereichs Psychologie und Sportwissenschaften an der Johann  

E-Print Network [OSTI]

Jahr). Artikel II Die Ă?nderung der Bachelorstudiengang tritt am Tage nach Bekanntgabe im UniReport in Kraft. Sie gilt ab Sommersemester 2010. Gleichzeitig tritt die Ordnung ĂĽber den Nachweis der sportlichen

Mester, Rudolf

364

UniReport Satzungen und Ordnungen vom 19. Dezember 2008 1 Satzung der Johann Wolfgang Goethe-Universitt Frankfurt am Main fr die Festset-  

E-Print Network [OSTI]

vorsehen, bleiben unberührt. § 3 Diese Satzung tritt am Tage nach ihrer Bekanntmachung im UniReport Satzungen und Ordnungen der Johann Wolfgang Goethe-Universität Frankfurt am Main in Kraft; sie tritt am 30

Mester, Rudolf

365

sprechenden Verffentlichungen bekannt gegeben Die studierbaren Fcher und Fcherkombinationen  

E-Print Network [OSTI]

Die Ă?nderung tritt nach der Genehmigung des Rek- tors mit Wirkung vom 1. Oktober 2007 in Kraft. Sie Modul ... ist Voraussetzung fĂĽr die Belegung von Modul ..." entfallen. Artikel 2 Die Ă?nderung tritt nach

Hoffmeister, Thomas S.

366

Inkrafttreten Diese Ordnung tritt mit Genehmigung durch die Se-  

E-Print Network [OSTI]

§ 7 Inkrafttreten Diese Ordnung tritt mit Genehmigung durch die Se- natorin für Bildung und. Artikel 2 Die �nderung tritt nach der Genehmigung des Rek- tors mit Wirkung vom 1. Oktober 2007 in Kraft

Hoffmeister, Thomas S.

367

Zweite Satzung zur nderung der Prfungs-und Studienordnung der  

E-Print Network [OSTI]

folgende Fassung: ,,§ 35 Inkrafttreten (1) Diese Satzung tritt am 1. Juli 2008 in Kraft. (2) 1 Wer im, zuletzt geändert durch Satzung vom 2. Dezember 2008." § 2 Diese Satzung tritt mit Wirkung vom 24

Hofmann, Martin

368

FREIEN HANSESTADT BREMEN 2009 Nr. 52Ausgegeben am 27. April 2009  

E-Print Network [OSTI]

Inkrafttreten (1) Diese Bekanntmachung tritt am Tag nach ihrer Veröffentlichung in Kraft. (2) Gleichzeitig tritt 2 Diese �nderung tritt nach der Genehmigung durch den Rektor mit Wirkung vom 1. Oktober 2005

Hoffmeister, Thomas S.

369

FREIEN HANSESTADT BREMEN 2008 Nr. 120Ausgegeben am 13. November 2008  

E-Print Network [OSTI]

Ă?nderungsordnung tritt nach der Genehmi- gung durch den Rektor am 1. April 2008 in Kraft. Sie gilt fĂĽr Studierende Ă?nderungsordnung tritt nach der Genehmi- g

Hoffmeister, Thomas S.

370

The Department of Chemical Engineering and Materials Science Michigan State University  

E-Print Network [OSTI]

a softwood kraft black liquor to determine the properties of solubilized lignin that resulted in their phase in the polysaccharide content of the black liquor, an effect of polysaccharide degradation and re- #12;adsorption

371

E-Print Network 3.0 - atypical imaging features Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

to make inferences about unknown attributes or features of the new product, or to form... brand image (e.g., Kraft) affect its categori zation? How will the image affect its...

372

Deutsches Elektronen-Synchrotron DESY Interne Verffentlichung  

E-Print Network [OSTI]

Autor See other side for an English version Zu Beginn des Jahres 2008 tritt ein neues Urheberrecht.1.2008 in Kraft tritt, wird sich das ändern (§ 137 l Abs. 1 UrhG). In Fällen, in denen ursprünglich alle, übertragen, bevor das neue Urheberrecht in Kraft tritt, also bis spätestens zum 31.12.2007. Dafür reicht die

373

ITP Forest Products: Energy and Environmental Profile of the...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Energy and Environmental Profile of the U.S. Pulp and Paper Industry ITP Forest Products: Energy and Environmental Profile of the U.S. Pulp and Paper Industry pulppaperprofile.pdf...

374

Vol. VII Issue II Spring 2005 Focus on Research  

E-Print Network [OSTI]

waste, including kudzu and pulp, and other cellulose sources such as office waste. "We've involved both

Wang, Xiaorui "Ray"

375

Assessment of China's Energy-Saving and Emission-Reduction Accomplishments and Opportunities During the 11th Five Year Plan  

E-Print Network [OSTI]

calcium carbide, coking, cement, coal, plate glass, pulp andcarbide 2 Mt Coking 80 Mt Cement 250 Mt Coal mining (

Levine, Mark D.

2010-01-01T23:59:59.000Z

376

PUBLICATIONS A. Journal articles and books  

E-Print Network [OSTI]

Pulps - Added Value for Paper and Board, Helsinki, Finland, June 4-8, 2001. Helsinki, Finland. pp. 373

377

China Energy Databook -- User Guide and Documentation, Version 7.0  

E-Print Network [OSTI]

and Alloys (kt) Paper Pulp (kt) Caustic Soda (kt) Paper and Paperboard (Mt) Soda Ash (kt) Motor Vehicles and Chasis [

Fridley, Ed., David

2008-01-01T23:59:59.000Z

378

Copyrighted Material "a Hound It Was"  

E-Print Network [OSTI]

Robert Madle, a dealer in science fiction and fantasy pulp magazines, as well as a member of First Fandom

Landweber, Laura

379

Potentials and policy implications of energy and material efficiency improvement  

E-Print Network [OSTI]

mechanical pulping Black liquor gasification/gasturbinefuels such as bark and black liquor, provide over 50% of the

Worrell, Ernst; Levine, Mark; Price, Lynn; Martin, Nathan; van den Broek, Richard; Block, Kornelis

1997-01-01T23:59:59.000Z

380

ImagINEa s u s t a i n a b l e c a m p u s How Can You Help?  

E-Print Network [OSTI]

in a plant using hydroelectricity to partially power the pulping process. How is Xerox Helping the U of C

Calgary, University of

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

E-Print Network 3.0 - aniline compounds Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 Halogenated Compounds Allyl chloride Carbon tetrachloride... Nitrates and Acids Ammoniated Compounds and Hypochlorites and Bleach Organic Nitrates Source: Oliver, Douglas L. -...

382

A Design Guide for Early-Market Electrochromic Windows  

E-Print Network [OSTI]

of a thin-film ceramic electrochromic window: Field studywindows in a bleached state (left) or colored state (right). Electrochromic coatings (EC) are switchable thin-film

2006-01-01T23:59:59.000Z

383

Leg 193 Preliminary Report 81 82 Leg 193 Preliminary Report  

E-Print Network [OSTI]

and bleached rocks with moderate to strong overprinting silicification Secondary mineralogy Secondary mineralogy = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = == = = = = = = = = = = = = = = = = = = = = == == Plagioclase No recovery ? Hematite 0 Alteration style No recovery LowersequenceUppersequence Muscovite Unit

384

E-Print Network 3.0 - apoptosis involving activation Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in the control of cnidarian bleaching where apoptosis and autophagy act... interconnectivity between apoptosis and autophagy has previously been shown in vertebrates...

385

E-Print Network 3.0 - apoptosis involves constitutive Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in the control of cnidarian bleaching where apoptosis and autophagy act... interconnectivity between apoptosis and autophagy has previously been shown in vertebrates...

386

Side 1 af 43 Alternative Additives  

E-Print Network [OSTI]

) ...............................................................12 5.1.2 Melting analysis of bleaching earth waste, sand, anorthosite, and clay sludge.............................................................................33 7.4 CLAY-SLUDGE................................................

387

Injection risk behavior among women syringe exchangers in San Francisco.  

E-Print Network [OSTI]

injection supplies (cotton, cookers, water, and bleach),injection equipment, such as cookers, cottons, and rinsepartners, n=148 Shared cooker, cotton, or rinse water

Lum, Paula J; Sears, Clare; Guydish, Joseph

2005-01-01T23:59:59.000Z

388

suggesting that fibre may be the active fraction. In experiment 3, lucerne meal, oat hulls, beet pulp and wheat straw were compared, at the same level (7.8 p. 100) of dietary fibre. Only  

E-Print Network [OSTI]

of lucerne proteins by those of soyabean meal or milk powder in a balanced diet for growing rabbits of dehydrated lucerne meal (DLM) on diet utilization by growing rabbits. Sixty young male rabbits (N. Z. Whitesuggesting that fibre may be the active fraction. In experiment 3, lucerne meal, oat hulls, beet

Paris-Sud XI, Université de

389

Aug 23, 2011 2:13 PM Page 1 of 2 UCSD Exposure Control Plan (ECP) University of California, San Diego  

E-Print Network [OSTI]

that the final concentration will be 10%. These must be emptied at least weekly. Solids: disposed of in labeled% household bleach solution made up fresh daily (Clorox or other bleach with Cal EPA registration number not recommend vaccination unless a risk-benefit assessment and medical consult is completed. Research staff

Kleinfeld, David

390

Advanced Recombinant Manganese Peroxidase for Biosynthesis of Lignin Bioproducts, Phase I Final Report, STTR Grant #: DE-SC0007503.  

SciTech Connect (OSTI)

The core purpose of this Phase I STTR was to evaluate the feasibility of a new method of producing a recombinant version of manganese peroxidase (MnP) enzyme. MnP is a potentially valuable enzyme for producing high value lignin products and also for industrial de-coloring operations such as biobleaching of pulp and color removal from textile dye effluents. This lignin-modifying enzyme is produced in small amounts by the native host, a white rot fungus. Previous work by Oregon State University developed a secreted recombinant version of the enzyme in the yeast Pichia pastoris. Unfortunately, the expression is barely moderate and the enzyme is heavily glycosylated, which inhibits purification. In this work, the gene for the enzyme is given a tag which targets production of the enzyme to the peroxisome. This is a promising approach since this location is also where heme and hydrogen peroxide are sequestered, which are both necessary cofactors for MnP. More than ten recombinant strains were constructed, verified, and expressed in the Pichia system. Constitutive (GAP) and methanol-induced promoters (AOX) were tried for peroxisomal targeted, cytosolic, and secreted versions of MnP. Only the secreted strains showed activity. The amount of expression was not significantly changed. The degree of glycosylation was lessened using the AOX (methanol) promotoer, but the resulting enzyme was still not able to be purified using immobilized metal affinity chromatography. Additional work beyond the scope of the defined Phase I project was undertaken to construct, verify, and express Pichia strains that mutated the MnP glycosylation sites to inhibit this process. These strains did not show significant activity. The cause is not known, but it is possible that these sites are important to the structure of the enzyme. Also beyond the scope proposed for our Phase I STTR, the team collaborated with AbSci, a startup with a new E. coli based expression system focused on the production of antibodies and enzymes containing disulfide bonds and requiring folding/post-translational modification. With only limited time remaining in the Phase I schedule, a single construct was made to produce MnP with this system. The enzyme was produced in the soluble fraction of the cell lysate, but no activity was measured. MnP from the existing recombinant source was used to act on lignin. The lignin was from a Kraft process and had a molecular weight of about 10,000 Da. Using 1000 Da dialysis membranes and UV-visible spectroscopy, no modification of either lignin was evident in the dialysate or the retentate. Assays using 2,6 dimethoxy phenol (DMP) as a substrate showed consistent activity throughout the project. In summary, these results fell far short of our expectations. A Phase II proposal was not submitted. Possible reasons for the failure of peroxisomal targeting include destruction by native hydrogen peroxide, native proteases, or unforeseen causes. The AbSci system was only lighted tested and further work may yield a strain with active enzyme. The lack of evidence for lignin modification may be due to the techniques employed. NMR or GC-MS studies may reveal evidence of modification.

Beatty, Christopher; Kitner, Joshua; Lajoie, Curtis; McClain, Sean; Potochnik, Steve

2012-12-13T23:59:59.000Z

391

Carbon-carbon bond cleavage of 1,2-hydroxy ethers b7 vanadium(V) dipicolinate complexes  

SciTech Connect (OSTI)

The development of alternatives to current petroleum-based fuels and chemicals is becoming increasingly important due to concerns over climate change, growing world energy demand, and energy security issues. Using non-food derived biomass to produce renewable feedstocks for chemicals and fuels is a particularly attractive possibility. However, the majority of biomass is in the form of lignocellulose, which is often not fully utilized due to difficulties associated with breaking down both lignin and cellulose. Recently, a number of methods have been reported to transform cellulose directly into more valuable materials such as glucose, sorbitol, 5-(chloromethyl)furfural, and ethylene glycol. Less progress has been made with selective transformations of lignin, which is typically treated in paper and forest industries by kraft pulping (sodium hydroxide/sodium sulfide) or incineration. Our group has begun investigating aerobic oxidative C-C bond cleavage catalyzed by dipicolinate vanadium complexes, with the idea that a selective C-C cleavage reaction of this type could be used to produce valuable chemicals or intermediates from cellulose or lignin. Lignin is a randomized polymer containing methoxylated phenoxy propanol units. A number of different linkages occur naturally; one of the most prevalent is the {beta}-O-4 linkage shown in Figure 1, containing a C-C bond with 1,2-hydroxy ether substituents. While the oxidative C-C bond cleavage of 1,2-diols has been reported for a number of metals, including vanadium, iron, manganese, ruthenium, and polyoxometalate complexes, C-C bond cleavage of 1,2-hydroxy ethers is much less common. We report herein vanadium-mediated cleavage of C-C bonds between alcohol and ether functionalities in several lignin model complexes. In order to explore the scope and potential of vanadium complexes to effect oxidative C-C bond cleavage in 1,2-hydroxy ethers, we examined the reactivity of the lignin model complexes pinacol monomethyl ether (A), 2-phenoxyethanol (B), and 1,2-diphenyl-2-methoxyethanol (C) (Figure 1). Reaction of (dipic)V{sup V}(O)O{sup i}Pr (1a) or (dipic)V{sup v}(O)OEt (lb) with A, B, or C in acetonitrile yielded new vanadium(V) complexes where the alcohol-ether ligand was bound in a chelating fashion. From the reaction of 1b with pinacol monomethyl ether (A) in acetonitrile solution, (dipic)V{sup v}(O)(pinOMe) (2) (PinOMe = 2,3-dimethyl-3-methoxy-2-butanoxide) was isolated in 61 % yield. Reaction of 1b with 2-phenoxyethanol (B) in acetonitrile gave the new complex (dipic)V{sup v}(O)(OPE) (3) (OPE = 2-phenoxyethoxide), which was isolated in 76% yield. In a similar fashion, 1a reacted with 1,2-diphenyl-2-methoxyethanol (C) to give (dipic)V(O)(DPME) (4) (DPME = 1,2-diphenyl-2-methoxyethoxide), which was isolated in 39% yield. Complexes 2, 3, and 4 were characterized by {sup 1}H NMR and IR spectroscopy, elemental analysis, and X-ray crystallography. Compared to the previously reported vanadium(V) pinacolate complex (dipic)V(O)(pinOH) the X-ray structure of complex 2 reveals a slightly shorter V = O bond, 1.573(2) {angstrom} vs 1.588(2) {angstrom} for the pinOH structure. Complexes 3 and 4 display similar vanadium oxo bond distances of 1.568(2) {angstrom} and 1.576(2) {angstrom}, respectively. All three complexes show longer bonds to the ether-oxygen trans to the oxo (2.388(2) {angstrom} for 2, 2.547(2) {angstrom} for 3, and 2.438(2) {angstrom} for 4) than to the hydroxy-oxygen in the pinOH structure (2.252(2) {angstrom}).

Hanson, Susan K [Los Alamos National Laboratory; Gordon, John C [Los Alamos National Laboratory; Thorn, David L [Los Alamos National Laboratory; Scott, Brian L [Los Alamos National Laboratory; Baker, R Tom [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

392

Use of sulfide-containing liquors for removing mercury from flue gases  

DOE Patents [OSTI]

A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions may include at least one of: sulfidic waste water, kraft caustic liquor, kraft carbonate liquor, potassium sulfide, sodium sulfide, and thioacetamide. The sulfide ion source is introduced into the scrubbing liquor as an aqueous sulfide species. The scrubber may be either a wet or dry scrubber for flue gas desulfurization systems.

Nolan, Paul S. (North Canton, OH); Downs, William (Alliance, OH); Bailey, Ralph T. (Uniontown, OH); Vecci, Stanley J. (Alliance, OH)

2003-01-01T23:59:59.000Z

393

Use of sulfide-containing liquors for removing mercury from flue gases  

DOE Patents [OSTI]

A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions may include at least one of: sulfidic waste water, kraft caustic liquor, kraft carbonate liquor, potassium sulfide, sodium sulfide, and thioacetamide. The sulfide ion source is introduced into the scrubbing liquor as an aqueous sulfide species. The scrubber may be either a wet or dry scrubber for flue gas desulfurization systems.

Nolan, Paul S.; Downs, William; Bailey, Ralph T.; Vecci, Stanley J.

2006-05-02T23:59:59.000Z

394

Productive Energy of Some Feeds and Foods as Measured by Gains of Energy by Growing Chickens.  

E-Print Network [OSTI]

by the animal. Metabolizable energy is the energy of the food less the energy in the excrement, both fecal and urinal and, in case of ruminants, in gases pro- duced by fermentation. It includes all the energy of the food which can be used by the animal... ............................ Citrus pulp, dried ----------,,--- Citrus pulp, dried ---- - ----------- Citrus pulp, dried ---------------- Cocoanut oil meal ---------------- Cocoanut oil meal ------------,--- Corn bran ---------,---------,-,, Corn bran...

Fraps, G. S. (George Stronach); Carlyle, E. C. (Elmer Cardinal)

1942-01-01T23:59:59.000Z

395

A Guidebook for Low-Carbon Development at the Local Level  

E-Print Network [OSTI]

Coal mining (production) Cement Iron-making Steel-making Electricity Pulp & paper Alcohol Monosodium glutamate Electrolytic aluminum Citric acid Coking

Zhou, Nan

2012-01-01T23:59:59.000Z

396

E-Print Network 3.0 - alley cropping Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Pulp, Hybrid Poplar and Willows) Biomass... and Renewable Energy Hybrid Poplar BMP's Energy producing crops Alternative Perennial ... Source: Minnesota, University of -...

397

araucaria angustifolia forest: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

such as lumber, wood-based panel, pulp, paper and packaging productsBeyond the familiar Global integration for metals, mining and forest and paper companies Industrial;...

398

ITP Chemicals: Energy and Environmental Profile of the U.S. Chemical...  

Broader source: Energy.gov (indexed) [DOE]

Opportunity Assessment for the Pulp and Paper, Chemical Manufacturing, and Petroleum Refining Industries ITP Chemicals: Chemical Bandwidth Study - Energy Analysis: A Powerful Tool...

399

United States Industrial Motor Systems Market Opportunities Assessment...  

Broader source: Energy.gov (indexed) [DOE]

Executive Summary (December 1998) More Documents & Publications United States Industrial Electric Motor Systems Market Opportunities Assessment Pulp and Paper Mills: Profiting...

400

E-Print Network 3.0 - annual shipping outlook Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the pulp, MDF and biomass industries. Summary: in the business of international trade of woodchips, pulplogs and biomass fiber. This annual report examines... of international...

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Top Value-Added Chemicals from Biomass - Volume II?Results of...  

Energy Savers [EERE]

resource. pnnl-16983.pdf More Documents & Publications Low Cost Carbon Fiber from Renewable Resources ITP Forest Products: Energy and Environmental Profile of the U.S. Pulp...

402

adjacent native forest: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

sophisticated breeding companies have emerged and become important contributors to world timber and pulp production. Most of these companies also contribute to international...

403

Methods of pretreating comminuted cellulosic material with carbonate-containing solutions  

DOE Patents [OSTI]

Methods of pretreating comminuted cellulosic material with an acidic solution and then a carbonate-containing solution to produce a pretreated cellulosic material are provided. The pretreated material may then be further treated in a pulping process, for example, a soda-anthraquinone pulping process, to produce a cellulose pulp. The pretreatment solutions may be extracted from the pretreated cellulose material and selectively re-used, for example, with acid or alkali addition, for the pretreatment solutions. The resulting cellulose pulp is characterized by having reduced lignin content and increased yield compared to prior art treatment processes.

Francis, Raymond

2012-11-06T23:59:59.000Z

404

Pacific Ethanol, Inc | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Pacific Ethanol, Inc Pacific Ethanol, Inc Pacific Ethanol, Inc More Documents & Publications RSE Pulp & Chemical, LLC (Subsidiary of Red Shield Environmental, LLC) Major DOE...

405

Emerging energy-efficient industrial technologies  

E-Print Network [OSTI]

and P. Parthsarathy. 1999. “Black Liquor Gasification: AKreutz, N. Berglin. 1998. “Black Liquor Gasifier/Gas TurbineSystem Options with Black Liquor Gasification. ” In Pulp and

2000-01-01T23:59:59.000Z

406

Black Liquor Research Program symposium: proceedings  

SciTech Connect (OSTI)

In the paper pulp industry's recovery boilers, black liquor is sprayed in through nozzle guns near the top of the furnace. This report includes eight papers. (DLC)

Emerson, D.B.; Whitworth, B.A.

1985-03-01T23:59:59.000Z

407

Waste Growth Challenges Local Democracy. The Politics of Waste between Europe and the Mediterranean: a Focus on Italy  

E-Print Network [OSTI]

capita); hydro (20%), black liquor, 6 peat, coal, wood fuel,to-door systems, but Black liquor is a byproduct of pulp,

Mengozzi, Alessandro

2010-01-01T23:59:59.000Z

408

Freeze crystallization technology for black liquor concentration. Second interim report  

SciTech Connect (OSTI)

The pulp and paper industry is one of the largest consumers of energy. Concentration of black liquor (the stream resulting from the chemical separation of wood fibers in the pulping operation) uses 25% of the purchased energy to produce pulp, an equivalent of 33 million barrels of oil in 1982. Here it is shown that freeze concentration, an emerging concentration technology, has the potential of reducing the energy consumption by at least 45%. This amounts to a cost savings of $5 to $15 per ton of pulp depending on the cost of energy, geographical location, and method of application.

Not Available

1983-07-01T23:59:59.000Z

409

Energy efficiency programs and policies in the industrial sector in industrialized countries  

E-Print Network [OSTI]

energy efficiency. Among industries included are cement, pulp and paper and plasticenergy efficiency in industry. Achievements: Production standards have been set for the engineering, plastics,

Galitsky, Christina; Price, Lynn; Worrell, Ernst

2004-01-01T23:59:59.000Z

410

annual industrial summary: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

requires a large amount of process water and energy in the form of steam and electric power. Consequently, the main environmental issues associated with pulp and paper production...

411

Dentistry (D.D.S. and D.M.D.) Degree There are two types of degrees dentist can attain  

E-Print Network [OSTI]

and pulp), orthodontics, pediatric dentistry, periodontics (tissue and bone supporting teeth), prosthodontics, and oral and maxillofacial pathology, radiology, and surgery. Prerequisite Courses The following

Pilyugin, Sergei S.

412

Lignin studies of transgenic Norway spruce.  

E-Print Network [OSTI]

??An attractive objective in tree breeding is to reduce the content of lignin, or increase its extractability, to favor delignification during pulping. This study investigates… (more)

Wadenbäck, Johan

2006-01-01T23:59:59.000Z

413

E-Print Network 3.0 - automatic fuzzy rule Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

PROCESSING TO PREDICT PULP BRIGHTNESS USING FUZZY LOGICPULP BRIGHTNESS USING FUZZY LOGIC Summary: Decision Support System (FuzzyFlou) Automatic Generation of Fuzzy Knowledge...

414

Carbon Emissions Reduction Potential in the US Chemicals and...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Carbon Emissions Reduction Potential in the US Chemicals and Pulp and Paper Industries by Applying CHP Technologies, June 1999 Carbon Emissions Reduction Potential in the US...

415

AMO Industrial Distributed Energy: Immediate Deployment of Waste Energy Technologies at Multiple Sites  

Broader source: Energy.gov [DOE]

Fact sheet overviewing Verso Paper Corp. project that will deploy industrial technologies to recover and reuse water and steam at pulp and paper facilities.

416

Pacific Ethanol, Inc  

Broader source: Energy.gov (indexed) [DOE]

RSE Pulp & Chemical, LLC (Subsidiary of Red Shield Environmental, LLC) Corporate HQ: Old Town, Maine Proposed Facility Location: Old Town, Maine Description: Develop, design, and...

417

Chemical Engineering Andrew Zydney  

E-Print Network [OSTI]

;ChE Employment (2003 at PSU) Merck Dow ExxonMob Air Products Amgen PPG Sunoco Kraft Foods NRC Procter, microelectronics, consumer products, biotechnology, fuels / energy, environmental engineering, etc. ·Chemical Engineers focus on the processes involved in making new products, including chemical reactions

Maranas, Costas

418

Reputation Matters Paula Dyke, ABC, CRMP  

E-Print Network [OSTI]

it well? Internationally ­ ranked by Reputation Institute ·BMW ·Sony ·The Walt Disney Company ·Daimler by Marketing Magazine ·Heinz ·Google ·Kellogg ·Sony ·Kraft ·Tim Hortons ·Campbell ·Canadian Tire ·Subway

Oyet, Alwell

419

The Astrophysical Journal, 722:17351743, 2010 October 20 doi:10.1088/0004-637X/722/2/1735 C 2010. The American Astronomical Society. All rights reserved. Printed in the U.S.A.  

E-Print Network [OSTI]

or continuously supplied to cluster cores to prevent the formation of cooling flows. A primary candidate--REHEATING THE COOL CORE OF A 3 keV CLUSTER FROM A NUCLEAR OUTBURST at z = 0.246 D. V. Lal1 , R. P. Kraft1 merger event. The temperature across the discontinuities is roughly constant with no signature of a cool

Evans, Dan

420

BIODIVERSITY The geography of climate change  

E-Print Network [OSTI]

BIODIVERSITY REVIEW The geography of climate change: implications for conservation biogeography D. J. B. Kraft1 INTRODUCTION It is widely recognized that climate change poses a grave threat., 2007). The impacts of climate change are broadly detectable in many taxa, including shifts in phenology

Kraft, Nathan

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Who Hires a Rice Jones Graduate School of Business MBA? The following is a list of employers who have hired MBAs from Rice within the past few years. These  

E-Print Network [OSTI]

Mobil FDIC Federal Reserve Bank of New York FMC Technologies General Electric Goldman Sachs Harrah, or individual student outreach. 3M AAA Capital Management Access America Funds American General Life Consulting Imperial Sugar Intel Johnson & Johnson JP Morgan Chase & Co Kalypso KBR Kimberly-Clark KPMG Kraft

Richards-Kortum, Rebecca

422

Auszug aus den Amtlichen Bekanntmachungen Nr. 1/2011 -Seite 58 Satzung fr das Zentrum fr  

E-Print Network [OSTI]

. die Vorschläge für die Erteilung von Lehrauf- trägen. § 5 In-Kraft-Treten Diese Satzung tritt am Tage. Gleichzeitig tritt die Satzung für das Sprachenzentrum der Universität Potsdam vom 29. Juli 1999 (AmBek. UP Nr

Potsdam, Universität

423

28.03.2008 8 Inhaltsverzeichnis  

E-Print Network [OSTI]

Gleichstellung tritt in seiner vorliegenden Fassung mit Wirkung ab 01.04.2008 in Kraft. (2) Er gilt zunächst für (Intensivstudiengang) Uni- versität Göttingen tritt am Tage nach ihrer Bekanntmachung in den Amtlichen Mitteilungen der

Gollisch, Tim

424

Friedrich-Wilhelms-Universitt Bonn  

E-Print Network [OSTI]

Friedrich-Wilhelms-Universität Bonn, 31. Jg., Nr. 15 vom 8. Juni 2001) tritt mit Wirkung zum 30. September 2016 au�er Kraft." #12;- 4 - Artikel II Diese Satzung tritt am Tag nach ihrer Veröffentlichung in den

Dutz, Hartmut

425

Ordnung zur nderung der Diplomprfungsordnung der Universitt Bremen fr den Studiengang Berufs-  

E-Print Network [OSTI]

folgende Fassung: ,,(1) Diese Prüfungsordnung in der Fassung vom 13. Dezember 2006 tritt mit der tritt mit der Genehmigung durch den Rektor in Kraft. Bremen, den 6. März 2007 Der Rektor der Universität

Hoffmeister, Thomas S.

426

Satzung der Universitt zu Lbeck zur Festsetzung von Curricularwerten vom 30. Juni 2014  

E-Print Network [OSTI]

/Au�erkrafttreten Diese Satzung tritt am Tage nach ihrer Bekanntmachung in Kraft. Sie gilt erstmals für die Berech- nung der Aufnahmekapazität zum Studienjahr 2014/15. Gleichzeitig tritt die Satzung der Universi- tät zu

Groppe, Sven

427

Verkndungsblatt der Gottfried Wilhelm Leibniz Universitt Hannover vom 19.12.2011 27/2011 Der Fakulttsrat der Fakultt fr Bauingenieurwesen und Geodsie der Gottfried Wilhelm Leibniz Universitt Hannover  

E-Print Network [OSTI]

. Das Präsidium hat die �nde- rung am 07.12.2011 gemä� § 37 Abs. 1 Nr. 5. b) NHG genehmigt. Sie tritt am Studiengänge des Bauingenieurwesens tritt zum 30.09.2015 au�er Kraft. #12;

Vollmer, Heribert

428

UniReport Satzungen und Ordnungen vom 16. Februar 2009 1 Satzung der Johann Wolfgang Goethe-Universitt Frankfurt am Main fr die Fest-  

E-Print Network [OSTI]

56 0 56 0 56 0 Artikel 2 Diese �nderung tritt am Tage nach ihrer Bekanntmachung im UniReport Satzungen und Ordnungen der Johann Wolfgang Goethe-Universität Frankfurt am Main in Kraft; sie tritt am 30

Mester, Rudolf

429

Nr . 97 Amtsblatt der Freien Hansestadt Bremen vom 7 . November 2012 793 Ordnung zur nderung der fachspezifischen  

E-Print Network [OSTI]

im Diplomstudiengang Er- ziehungswissenschaft immatrikuliert sind . Diese Prü- fungsordnung tritt am ." Artikel 2 Diese �nderung tritt nach der Genehmigung durch den Rektor am 30 . September 2012 in Kraft . Sie CP ge- wichtet ." 8 . In § 8 werden folgende Absätze ergänzt: ,,(7) Zum Wintersemester 2012/13 tritt

Hoffmeister, Thomas S.

430

FREIEN HANSESTADT BREMEN 2011 Nr. 66Ausgegeben am 13. August 2012  

E-Print Network [OSTI]

mehr auf- genommen . Diese PrĂĽfungsordnung tritt mit Ablauf des 30 . September 2017 auĂ?er Kraft . (6 Satz 2 bleibt unberĂĽhrt ." Artikel 2 Diese Ă?nderung tritt nach der Genehmigung durch den Rektor am 1

Hoffmeister, Thomas S.

431

Coping with Drought on Rangelands: Concluding Remarks  

E-Print Network [OSTI]

of information disseminated... From David Kraft #12;Reflections · So, this is our socio ecological system · We spheres of interactions of drought Impacts: ­ Biophysical landscape ­ Economic landscape ­ Institutional provoked liquidation ­ 64% of producers are 55 or older & average farm/ranch size of older producers is 75

432

2011-12 UNIVERSITY OF MINNESOTA DECEMBER 1, 2011  

E-Print Network [OSTI]

Education David Kraft, College of Liberal Arts Jonathan Morris, College of Science and Engineering Hayden, advisors, counselors, and extension service workers. Most people stay in this classification or move. The classification was started in 1945 with the passage of the civil service rules by the Regents. In 1984 PELRA

Janssen, Michel

433

Methods for colloid transport visualization in pore networks Naoyuki Ochiai,1  

E-Print Network [OSTI]

Methods for colloid transport visualization in pore networks Naoyuki Ochiai,1 Erika L. Kraft,2 visualization in pore networks, Water Resour. Res., 42, W12S06, doi:10.1029/2006WR004961. 1. Introduction [2 fragments, mineral precipitates and organic macromolecules, as well as micro- organisms (e.g., protozoa

Tullos, Desiree

434

Payment list S.No Names Country  

E-Print Network [OSTI]

Payment list S.No Names Country 1 A. Bueck Germany 2 A. Kronenburg Germany 3 Achintya Mukhopadhyay Chennai 4 Christoph Kirse Germany 5 Heiko Briesen Germany 6 Jitendra Kumar Germany 7 Mahesh V . Panchagnula Chennai 8 Marchisio, D. L. Italy 9 Markus Kraft UK 10 Martin. A. J. Hartig Germany 11 Menwer M

Srinivasan, N.

435

Primary Research Paper Invertebrate community and stream substrate responses to woody debris  

E-Print Network [OSTI]

. Introduction Large-extent physical disturbances, such as ice storms, can produce wide-ranging impacts removal from an ice storm-impacted stream system, NY USA Dana R. Warren* & Clifford E. Kraft Department; ice storm; debris dam; high gradient stream; BACI Abstract We assessed the influence of ice

Kraft, Clifford E.

436

COLLEGE OF ACES UNDERGRADUATE  

E-Print Network [OSTI]

pursue your own business, a corporate job, a government specialty, or a research position. Design and drainage, erosion control and the effective utilization of natural resources. TSM Specializations such as Deere & Co., a government agency such as the U.S. EPA, or a company like Kraft Foods. You may

Gilbert, Matthew

437

Moisture Control in Insulated Raised Floor Systems in Southern Louisiana  

E-Print Network [OSTI]

polyisocyanurate foam, open-cell sprayed polyurethane foams of vary- ing vapor permeance, closed-cell sprayed polyurethane foam, and kraft-faced fiberglass batt insulation. Expected Outcomes This research will result Association Southern Forest Products Association Contact Information Samuel V. Glass USDA Forest Service

438

Ratchel U., Investigation on the use of palm olein as lubrication oil  

E-Print Network [OSTI]

The research work is on the possibility of producing lubricating oil from vegetable oil with palm olein as a case study. The sample analysed was obtained from Vandeikya Local Government Area of Benue State. Some of the physical and chemical properties such as viscosity, flash/fire point, pour point and specific gravity were analysed. This sample was bleached to remove the red colour (carotene) and gummy materials. The bleached sample was tested to determine the above mentioned properties. Comparison of the crude palm olein and the bleached sample with the conventional lubricants obtained from Elf Plc, Kaduna and Unipetrol Plc, Kaduna was made. Finally, it was discovered that the crude palm olein and the bleached sample exhibit a good base as a lubricant.

A. B. Hassan; M. S. Abolarin; A. Nasir; U. Ratchel

439

DENNIS ET AL. VOL. 6 ' NO. 4 ' 29172924 ' 2012 www.acsnano.org  

E-Print Network [OSTI]

limitations based on the rapid photo- bleaching of these dyes disallow the track- ing of cellular processesHi of intact cells and subcellular compartments. Here we describe a nanoparticle- based ratiometric pH sensor

440

Shock Chlorination of Wells  

E-Print Network [OSTI]

Shock chlorination is a method of disinfecting a water well. This publication gives complete instructions for chlorinating with bleach or with dry chlorine. It is also available in Spanish as publication L-5441S...

McFarland, Mark L.; Dozier, Monty

2003-06-11T23:59:59.000Z

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Fish assemblages on coral reefs in Guanaja, Bay Islands, Honduras  

E-Print Network [OSTI]

reefs that support a wide variety of habitats, a rich ichthyofauna, and one of the highest coral diversities found in the Caribbean, Guanaja is one of Honduras' major eco-tourism destinations. Coral bleaching, a phenomena initially documented in 1931...

Mahendran, Christopher Kandiah

2012-06-07T23:59:59.000Z

442

Disinfecting Water Wells by Shock Chlorination  

E-Print Network [OSTI]

If your well has been flooded, it must be shock chlorinated before it can be used as a source of drinking water. This publication explains how to disinfect a well using either dry chlorine or liquid household bleach....

Dozier, Monty; McFarland, Mark L.

2005-09-30T23:59:59.000Z

443

2009 Virginia Polytechnic Institute and State University 2906-1328 Virginia Cooperative Extension programs and employment are open to all, regardless of race, color, national origin, sex, religion, age, disability, political beliefs, sexual orientation, o  

E-Print Network [OSTI]

to Surflan can be found at the website www.farmsaver.com. This company is selling this herbicide under its temporary bleaching of leaves, especially midveins. Injury is more likely to occur in sandy compared to clay

Liskiewicz, Maciej

444

Nanotechnology in our Daily Life Iridescent car paint: Based on interference colors  

E-Print Network [OSTI]

Nanotechnology in our Daily Life Iridescent car paint: Based on interference colors (like a butterly, no bleaching after 5 years Miami) #12;Nanotechnology on our Desktops Hard Disk Sensor Medium

Himpsel, Franz J.

445

Neuronal Culture Preparation and Stimulation. Dissociated hippocampal cell culture was prepared as described in ref. 1. Briefly, rats were killed on postnatal day 0-1,  

E-Print Network [OSTI]

and bleaching throughout the experiment. Neurons were imaged with a mercury arc lamp with 0.33-1.5% neutral precipitation (2), allowed to mature to 14-17 DIV and assayed. Highly expressing neurons with clear plasma

Tsien, Roger Y.

446

aqueous waste management: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Microbiological Waste Steam Sterilization 1. temperature of at least 121 of household bleach diluted 1:10 with water or b. a solution of 70% by volume of 2-propanol...

447

134 BioScience February 2001 / Vol. 51 No. 2 Plantations of forest trees have been established  

E-Print Network [OSTI]

companies have emerged and become important contributors to world timber and pulp production. Most established throughout the world, primarily to provide structural timber and fiber for pulp.In the Northern of these companies also contribute to international efforts to reduce the logging of old-growth native forests

448

Department of Mechanical Engineering Fall 2011 PSU Engineering Leadership and Development Program Baobab Fruit  

E-Print Network [OSTI]

Program ­ Baobab Fruit Pulp Processor Overview A baobab is a fruit that grows on trees native to sub-Saharan region in Africa. Many small villages are beginning to process the baobab fruit by separating the seeds of students designed a baobab fruit pulp processor for a small community in Africa. For our project we were

Demirel, Melik C.

449

Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and  

E-Print Network [OSTI]

: Bioanode Microbial anode Pulp mill effluent Microbial fuel cell a b s t r a c t Microbial bioanodes were the emergent technology of microbial fuel cells (MFCs) to the treatment of effluents. MFCs would offer and theoretical characterization of microbial bioanodes formed in pulp and paper mill effluent

Paris-Sud XI, Université de

450

Research on the use of dehydrated whole maize plant in the feed of growing rabbits  

E-Print Network [OSTI]

and lignin) are not determined. Comparing lucerne meal, safflower meal, beet pulp and grape pomace at America) New Zealand White rabbits were fed diets based on lucerne, safflower meal, grape pomace and beet pulp. Though not significant, feeding safflower meal and lucerne produced a higher level of lactation

Paris-Sud XI, Université de

451

UBC Social Ecological Economic Development Studies (SEEDS) Student Report An Investigation Into the Wheat Straw Paper  

E-Print Network [OSTI]

pulping is the black liquor residue. Regarding the black liquor, a by-product of wheat straw pulping, Vibratory Shear Enhanced Process (VSEP) shows that lignin and hemicelluloses can be extracted from the blackUBC Social Ecological Economic Development Studies (SEEDS) Student Report An Investigation

452

USDA Forest Service Gen. Tech. Rep. PSW-152. 1995. 257 Pollution and Fishing Threats to Marbled Murrelets  

E-Print Network [OSTI]

(PCB), and pulp mill discharges containing polychlorinated dibenzo-dioxins (PCDD) and polychlorinated dioxins and furans which have been discharged to the environment at levels resulting in significant injury of dioxins in Western Grebes, which have a prey base Figure 1--Distribution of paper grade pulp mills active

Standiford, Richard B.

453

Design and Evaluation of Alternative Cogeneration Systems  

E-Print Network [OSTI]

completed for pulp and paper industry. The designs were done for two 1985 market pulp mills: one in New England, and the other in the Northwest. The second set of conceptual designs are being performed for two enhanced oil recovery sites. Two additional site...

Mauro, R. L.; Hu, S. D.

1982-01-01T23:59:59.000Z

454

through world-class science and technology  

E-Print Network [OSTI]

Operational Excellence - Leveraging core competence in pulp & paper processes ·Achieving cost and reliability by developing renewable chemicals ·Creating sustainable fuels from forest biomass Biomaterials - Leveraging for Sustainable Systems (ISS) IPST Analytical Services Specialized analytical services in pulp and paper

455

Removal of wax and stickies from OCC by flotation. Progress report No. 3, July 1--September 30, 1998  

SciTech Connect (OSTI)

In this quarter we completed low consistency laboratory pulping trials. Pulping results were analyzed in terms of defibering index or yield and the concentration of free wax. The objective of these trials is to identify pulping conditions that will give higher yield and higher concentration of free wax. The yields from low consistency pulping trials ranged from 90 to 99% based on 6-cut laboratory screen rejects. In general, high temperatures (140-150{degree}F) and high pH (9.5-10) conditions resulted in higher yield and the generation of free wax. Factors such as rotor speed and the gap (between the rotor and grate) were not significant in affecting defibering. Generally, the turbidities of filtrates from wax-contaminated pulps increased with increase in temperature and/or pH. The filtrate turbidity indicated the relative concentration of finely dispersed wax that could be removed from pulp dewatered on a 30 {micro}m filter paper. Preliminary experiments were conducted to study flotation conditions necessary for effective removal of wax from pulp. Factors which are important for effective flotation include flotation time, volume of air, surfactant concentration and type, and low temperature. Future plans include additional flotation trials to better optimize conditions. Other contaminant types include pressure sensitive adhesives and hot melts will also be examined. This will be followed by pilot plant and mill trials.

Doshi, M.R.; Dyer, J. [Doshi and Associates, Inc., Appleton, WI (United States); Heise, O.; Cao, B. [Voith Sulzer Papertechnology, Appleton, WI (United States)

1998-11-01T23:59:59.000Z

456

Removal of wax and stickies from OCC by flotation. Progress report No. 3, July 1--September 30, 1998  

SciTech Connect (OSTI)

In this quarter we completed low consistency laboratory pulping trials. Pulping results were analyzed in terms of defibering index or yield and the concentration of free wax. The objective of these trials is to identify pulping conditions that will give higher yield and higher concentration of free wax. The yields from low consistency pulping trials ranged from 90 to 99% based on 6-cut laboratory screen rejects. In general, high temperatures (140-150{degrees}F) and high pH (9.5-10) conditions resulted in higher yield and the generation of free wax. Factors such as rotor speed and the gap (between the rotor and grate) were not significant in affecting defibering. Generally, the turbidities of filtrates from wax-contaminated pulps increased with increase in temperature and/or pH. The filtrate turbidity indicated the relative concentration of finely dispersed wax that could be removed from pulp dewatered on a 30 {micro}m filter paper. Preliminary experiments were conducted to study flotation conditions necessary for effective removal of wax from pulp. Factors which are important for effective flotation include flotation time, volume of air, surfactant concentration and type, and low temperature. Future plans include additional flotation trials to better optimize conditions. Other contaminant types include pressure sensitive adhesives and hot melts will also be examined. This will be followed by pilot plant and mill trials.

Dosh, M.R.; Dyer, J. [Doshi and Associates, Inc., Appleton, WI (United States); Heise, O.; Cao, B. [Voith Sulzer Papertechnology, Appleton, WI (United States)

1998-11-01T23:59:59.000Z

457

Glass, steel tins and paper are regularly removed from doorsteps around Britain to be melted, smelted and pulped ready to be turned into raw materials for reuse in objects as diverse as jam jars and new spapers. The problem is, recycling is not alw ays th  

E-Print Network [OSTI]

and new spapers. The problem is, recycling is not alw ays the most environmentally acceptable process. Let and recycling. How ever, this act of recycling uses energy and produces carbon dioxide, the gas most associated://shop.bsigroup.com/bs8887-220 Something better than recycling? Institution 2010 9/13/2010 Something better than recycling

458

Proceedings of the DOE/Industry Sensor Working Group meeting, Austin, Texas  

SciTech Connect (OSTI)

This paper report contains topics presented at a sensor workshop group meeting. The topics describe measuring instruments of use in the pulp and paper industry. Topics include: measurement of solids fraction; process instrumentation research for the pulp paper industry; real-time non-contact optical surface motion monitor; on-machine sensors to measure paper mechanical properties; hierarchical intelligent control of industrial processes -- an in-parallel lime kiln application; proposal for research on lignin concentration measurement in pulping liquors; and advanced polymeric sensor materials for industrial drying.

Not Available

1988-11-01T23:59:59.000Z

459

The interrelationship between environmental goals, productivity improvement, and increased energy efficiency in integrated paper and steel plants  

SciTech Connect (OSTI)

This report presents the results of an investigation into the interrelationships between plant-level productivity, energy efficiency, and environmental improvements for integrated pulp and paper mills and integrated steel mills in the US. Integrated paper and steel plants are defined as those facilities that use some form of onsite raw material to produce final products (for example, paper and paperboard or finished steel). Fully integrated pulp and paper mills produce onsite the pulp used to manufacture paper from virgin wood fiber, secondary fiber, or nonwood fiber. Fully integrated steel mills process steel from coal, iron ore, and scrap inputs and have onsite coke oven facilities.

NONE

1997-06-01T23:59:59.000Z

460

Verkndungsblatt 7|2013 Ausgabedatum 03.06.2013  

E-Print Network [OSTI]

genehmigt. Sie tritt am Tage nach ihrer hochschulöffentlichen Bekanntmachung im Verkündungsblatt der tritt zum 30.09.2014 au�er Kraft. #12;Verkündungsblatt der Gottfried Wilhelm Leibniz Universität �nderung am 08.05.2013 gemä� § 37 Abs. 1 Nr. 5. b) NHG geneh- migt. Sie tritt am Tage nach ihrer

Vollmer, Heribert

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Univ. Prof. Dr. rer. nat. Wolfgang H. Muller Technische Universitat Berlin  

E-Print Network [OSTI]

¨ogliche Kraft: Pmax = 78,9 kN (b) Die maximale Schubspannung tritt am Au�enrand des Stabes und berechnet sich erh¨alt man: Bei C tritt nur das Torsionsmoment MD auf. Daraus ergibt sich die Torsionspannung = MD IP D 2 = 16MD D3 (20) Eine Normalspannung xx tritt nicht auf, da es weder Biegemoent noch Normalkraft

Berlin,Technische Universität

462

Fundamental Study of Black Liquor Gasification Kinetics. Quarterly progress report for the period October 1999 to December 1999  

SciTech Connect (OSTI)

The overall objective of this research is to evaluate the kinetics of gasification of kraft black liquor under laboratory conditions simulating pressurized, oxygen-blown gasification. The significant independent variables are gasifier temperature, black liquor composition particle size, and particle residence time. The authors will quantify their impact on the concentration of major and trace gas phase species, as well as the composition of condensed phase inorganic products, including specification of the Na- and S-containing compounds and overall carbon conversion.

NONE

2000-01-31T23:59:59.000Z

463

Conceptual design of a black liquor gasification pilot plant  

SciTech Connect (OSTI)

In July 1985, Champion International completed a study of kraft black liquor gasification and use of the product gases in a combined cycle cogeneration system based on gas turbines. That study indicated that gasification had high potential as an alternative to recovery boiler technology and offered many advantages. This paper describes the design of the plant, the construction of the pilot plant, and finally presents data from operation of the plant.

Kelleher, E. G.

1987-08-01T23:59:59.000Z

464

Direct fuel cell for the production of electricity from lignin  

SciTech Connect (OSTI)

This report describes the use of an anthraquinone mediated fuel cell for the direct production of electrical energy from sulfonated lignin and Kraft Black Liquor. The cell produces the equivalent of one kWh for each 2-3 lb sulfonated lignin and 5-8 lb black liquor combustibles. In the case of the sulfonated lignin, chain session occurs during the oxidation process, reducing the molecular weight from ca. 2 x 10/sup 4/ to less than 1000 D.

Weetall, H.H.; Forsyth, B.D.; Hertl, W.

1985-07-01T23:59:59.000Z

465

851 S.W. Sixth Avenue, Suite 1100 Steve Crow 503-222-5161 Portland, Oregon 97204-1348 Executive Director 800-452-5161  

E-Print Network [OSTI]

that the largest industrial load in the region is pulp and paper, Eden continued. A preliminary supply curve shows of the residential power load referred to as information, communication, and entertainment or ICE. Jeff King updated

466

The Analysis and Development of Large Industrial Steam Systems  

E-Print Network [OSTI]

Chemicals, petroleum, pulp and paper, and many other industries depend heavily on extensive complex steam systems for thermal and mechanical energy delivery. Steam's versatility and desirable characteristics as both a heat transfer medium and a...

Waterland, A. F.

1980-01-01T23:59:59.000Z

467

509Ann. For. Sci. 60 (2003) 509517 INRA, EDP Sciences, 2003  

E-Print Network [OSTI]

mil- lion m3 and the wood produced is mainly used for wood pulp (53%), woodchip (36%) and saw timber (11%) [7]. Most eucalypts are planted by forestry companies on exist- ing forest soils, in areas

Boyer, Edmond

468

Selenium Accumulation, Distribution, and Speciation in Spineless Prickly Pear Cactus: A Drought- and Salt-Tolerant, Selenium-Enriched Nutraceutical Fruit Crop for Biofortified Foods  

E-Print Network [OSTI]

Enriched Nutraceutical Fruit Crop for Bioforti?ed Foods Garyavonoids found in Opuntia fruit can enhance the function ofof total Se in cladode, fruit juice, fruit pulp, and seed is

Banuelos, Gary S.

2012-01-01T23:59:59.000Z

469

Engineering & Science is printed on recycled paper containing a minimum of 10 percent post-consumer waste. The paper's virgin  

E-Print Network [OSTI]

-consumer waste. The paper's virgin pulp comes from trees grown in the U.S. in accordance with the Forest of Caltech research will still be told, E&S-style. on the electronic frontier, work on the new websites

470

E.2. Electronic Appendix -Food Web Elements of the Fraser River Upper River (above rkm 210)  

E-Print Network [OSTI]

1 E.2. Electronic Appendix - Food Web Elements of the Fraser River Basin Upper River (above rkm 210, but improvements at pulp mills and waste water treatment plant upgrades are thought to have improved water quality

471

FACULTY OF APPLIED SCIENCE ENGINEERING NEWS  

E-Print Network [OSTI]

how his research in the Pulp and Paper Centre -- applying and heating thermoplastic polymers to lift found an ingenious way to relieve the stress of dropped calls by using radio and TV channels to transmit

Pulfrey, David L.

472

The Effect of Uncertainty on Pollution Abatement Investments: Measuring Hurdle Rates for Swedish Industry  

E-Print Network [OSTI]

The Effect of Uncertainty on Pollution Abatement Investments: Measuring Hurdle Rates for Swedish Industry Abstract: We estimate hurdle rates for firms' investments in pollution abatement technology, using, oil price uncertainty, abatement investment, sulfur emissions, pulp and paper industry, energy

Paris-Sud XI, Université de

473

Greening the invisible hand : how environmental non-governmental organizations (NGOs) succeed and fall in technology change  

E-Print Network [OSTI]

This dissertation examines how national environmental non-governmental organizations (NGOs) in Sweden and the United States (US) tried to diffuse cleaner production technologies in the pulp and paper industry from 1980-1998. ...

Rossi, Mark S. (Mark Stephen), 1962-

2003-01-01T23:59:59.000Z

474

Toxicity Analysis of Polycyclic Aromatic Hydrocarbon Mixtures  

E-Print Network [OSTI]

in people who work in pulp and paper mills, at hazardous waste sites, municipal and hazardous waste incinerators, and those involved in production, use, and disposal of chlorinated pesticides and herbicides. The most toxic of the PCDDs, 2...

Naspinski, Christine S.

2010-01-16T23:59:59.000Z

475

Beyond the Price Effect in Time-of-Use Programs: Results from a Municipal Utility Pilot, 2007-2008  

E-Print Network [OSTI]

Alexander, Barbara. 2007. Smart Meters, Real Time Pricing,http://www.pulp.tc/Smart_Meters__Real_Time.pdf. Oak Ridge,are scheduled to receive “smart meters” in the coming years.

Lutzenhiser, Susan

2010-01-01T23:59:59.000Z

476

Economic and Policy Factors Affecting Energy Efficiency Improvements in the U. S. Paper Industry  

E-Print Network [OSTI]

The U.S. pulp, paper and paperboard industry has made significant improvements over the past eleven years in the energy efficiency of its operations. The industry is firmly committed to: increased utilization of important renewable domestic energy...

Freund, S. H.

1984-01-01T23:59:59.000Z

477

Comprehensive Research Areas in ChBE Biomedical Engineering  

E-Print Network [OSTI]

& BioprocessingCatalysis, Reaction Kinetics & Reaction EngineeringComplex Fluids & Multiphase Flow EnergyComprehensive Research Areas in ChBE Biomedical Engineering Biotechnology, Bioinformatics & M EM S Nanotechnology Polymers & Materials Science Process Systems Engineering Pulp & Paper

Sherrill, David

478

Rule-Based Energy Management System Applied to Large Industrial Facilities  

E-Print Network [OSTI]

Deregulation of electricity and rising fuel costs are causing renewed interest in Energy Management Systems (EMS). This paper details the results of integrating a rule-based EMS controller at a Pulp and Paper Mill and additional findings from...

Gauthier, M.; Childress, R. L.

479

Copyright 2009, The Ohio State University Family and Consumer Sciences  

E-Print Network [OSTI]

. If kept at room temperature, uncooked jams and jellies will mold or ferment in a short time. Uncooked jams- tainingsmallpiecesoffruitorpeel.Marmaladesoften contain citrus fruit. Fruit butters are sweet spreads made by cooking fruit pulp

480

Preliminary Results from the Industrial Steam System Market Assessment  

E-Print Network [OSTI]

This paper discusses fuel use and potential energy savings in the steam systems of three steam intensive industries: pulp and paper, chemical manufacturing, and petroleum refining. To determine the energy consumption to generate steam...

McGrath, G. P.; Wright, A. L.

Note: This page contains sample records for the topic "kraft pulping bleaching" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Improvement in electrochromic stability of electrodeposited nickel hydroxide thin film  

SciTech Connect (OSTI)

The electrochromic nickel hydroxide thin film was anodically deposited from an aqueous solution. The effect of solution temperature, postheat-treatment temperature, and addition of cadmium on the electrochromic behavior (color/bleach durability cycle, response time, and coloration efficiency of the nickel hydroxide films in NaOH) were investigated. A significant increase in the color/bleach durability cycle from 500 (for the as-deposited film) to more than 5000 cycles (for the heat-treated film) was observed. The addition of cadmium increased the utilization of the active materials. It was found that the coloration efficiency was 40 cm{sup 2}/C and coloration and bleaching response time were 20 to 30 s and 8 to 10 s, respectively. The change in the electrochromic properties with heat-treatment temperature is discussed based on the physical and electrochemical analysis.

Natarajan, C.; Matsumoto, H.; Nogami, G. [Kyushu Inst. of Tech., Kitakyushu (Japan). Dept. of Electrical Engineering

1997-01-01T23:59:59.000Z

482

Countercurrent Process for Lignin Separation from Biomass Matrix  

SciTech Connect (OSTI)

The overall goal of the project was to test the concept of using a twin-screw extruder to conduct autohydrolysis pretreatment of wheat straw in countercurrent fashion, demonstrate in situ solid/liquid separation, and produce a low-lignin cellulose product using ethanol as an extractant. The resultant solid product is suitable for sugar production through enzymatic hydrolysis and for pulp applications. Pilot-scale equipment was used to successfully demonstrate the process both for sugar and pulp applications.

Kiran Kadam; Ed Lehrburger

2006-03-31T23:59:59.000Z

483

Adaption of Machine Fluid Analysis for Manufacturing - Final Report  

SciTech Connect (OSTI)

Pacific Northwest National Laboratory (PNNL: Operated by Battelle Memorial Institute for the Department of Energy) is working with the Department of Energy (DOE) to develop technology for the US mining industry. Filtration and lubricant suppliers to the pulp and paper industry had noted the recent accomplishments by PNNL and its industrial partners in the DOE OIT Mining Industry of the Future Program, and asked for assistance in adapting this DOE-funded technology to the pulp and paper industry.

Pardini, Allan F.

2005-08-16T23:59:59.000Z

484

RUMINAL ADAPTATION TO INCREASING LEVELS OF CONCENTRATES  

E-Print Network [OSTI]

.0 % citrus pulp, 1.0 % lard, 7.0 % sugarbeet pulp, 3.3 % oat husk meal, 2.0 % coconut expeller and 2-chromatography. The rate of lactate fermentation was measured by incubation of 10 ml rumen fluid (taken at 14.00 h) with 1. If adaptation occurs one should expect an increase of lactate and a higher rate of L- lactate fermentation

Paris-Sud XI, Université de

485

Flotation machine  

SciTech Connect (OSTI)

A flotation machine is described for beneficiating minerals comprising: a vertical cylindrical chamber for circulating a flotation pulp; a downwardly tapered bottom connected to said vertical cylindrical chamber; feed pipe means for feeding the flotation pulp carrying mineral particles of fine fraction, particles of the useful ingredient of the fine fraction being capable of floating up from the volume of said aerated pulp; discharge pipe means connected to the tapered bottom near its lowest point for discharging gangue; an annular trough for collecting froth concentrate at the top of said chamber; a group of frustoconical shells each having bases of different diameters and a tapered surface secured axially in said chamber and spaced equidistantly from one another height wise of said chamber; aerator means for aerating the flotation pulp secured to the walls of said chamber and communicating therewith to provide aerated water into said chamber; means for feeding mineral particles of coarse fraction, particles of the useful ingredient of the coarse fraction being capable of floating in the froth layer of the flotation pulp, in the form of a hydrocyclone having a cylindrical casing positioned axially over said chamber and a downwardly tapering outlet directed downwardly to feed the coarse particles to said chamber; feed pipe means for feeding the flotation pulp carrying mineral particles of coarse fraction positioned tangentially at said cylindrical casing of the hydrocyclone; and evacuation means for evacuating the liquid phase of the flotation pulp positioned tangentially at said casing of the hydrocyclone over said feed pipe means and connected to said feed pipe means for feeding the flotation pulp carrying mineral particles of the fine fraction.

Zlobin, M.N.; Permyakov, G.P.; Nemarov, A.A.; Metsik, V.M.; Medetsky, J.V.; Taraban, N.T.

1993-08-10T23:59:59.000Z

486

The Manufacture of Cane Syrup.  

E-Print Network [OSTI]

corn is quite surprising, and the daily quantity of grain consumed is something over 100,000 bushels. There are four primary products obtained from the grain of the corn. The hull or outside covering of the corn is taken off and is known as corn... suspended matter, and then through bone-black to bleach or decolorize it. It has then a small amount of sodium bisulphide added to it to bleach it and to prevent fermentation, and boiled down in a vacuum pan to the right degree of concentration for syrup...

Harrington, H. H. (Henry Hill)

1903-01-01T23:59:59.000Z

487

Investigations into the Chemistry of Laudering  

E-Print Network [OSTI]

in the solution 1711-1666 Same as above, but completely immersed 1634, 1634 Boiled in 2.5 N a 2 C 0 3 , for 3.5 hrs. half im­ mersed 1648 Same as one above but completely immersed... 1636 Boiled in 5 per cent NasCOa for 3.5 hrs., im­ mersed completely 1625... D OF CLOTH solution used Original muslin JVJJ Muslin, bleached medium (Muslin A ) v/!;; Muslin, bleached strongly (Muslin B) A/ 1 0 _ Muslin B N 7 1 0 rinsed 3 times with distilled wat( Original muslin A V J O Muslin A A7J0 Muslin B AV 0...

Faragher, W.F.

1910-01-01T23:59:59.000Z

488

Microtubule dynamics in vivo: a test of mechanisms of turnover  

E-Print Network [OSTI]

Abstract. Clarification of the mechanism of microtubule dynamics requires an analysis of the microtubule pattern at two time points in the same cell with single fiber resolution. Single microtubule resolution was obtained by microinjection of haptenized tubulin (fluorescein-tubulin) and subsequent indirect immunofluorescence with an antifluorescein antibody. The two time points in a single cell were, first, the time of photobleaching fluorescein-tubulin, and second, the time of fixation. The pattern of fluorescence replacement in the bleached zone during this time interval revealed the relevant mechanisms. In fibroblasts, microtubule domains in the bleached zone are replaced microtubule by microtubule and not by mechanisms that affect all microtubules simultaneously.

Paul J. Sammak

1987-01-01T23:59:59.000Z

489

Tips for Living Green Conduct a home energy audit -hes.lbl.gov or fcgov.com/greenbuilding/home/existing_programs.php  

E-Print Network [OSTI]

overnight and when not in use. Save energy and money by covering your pots while cooking and air dry your money and resources. Replace caustic cleaning products with environmentally-friendly alternatives like products. Give up the bleach: switch to organic cotton tampons or check out the Diva Cup - www

490

Improving the photostability of bright monomeric orange and red fluorescent proteins  

E-Print Network [OSTI]

Improving the photostability of bright monomeric orange and red fluorescent proteins Nathan C illumination. Although fluorescent proteins typically bleach at a substantially slower rate than many small-molecule dyes, in many cases the lack of sufficient photostability remains an important limiting factor

Tsien, Roger Y.

491

Cyclophilin and the Regulation of Symbiosis in Aiptasia pallida  

E-Print Network [OSTI]

microscopy using superoxide and nitric oxide-sensitive fluorescent dyes on live specimens of A. pallida the CsA-sensitive isomerase activity is important for main- taining the activity of the antioxidant as cnidarian bleaching, results through mechanisms dependent on host cell death pathways triggered in part

492

Functionalized Europium Oxide Nanoparticles Used as a Fluorescent Label in an Immunoassay  

E-Print Network [OSTI]

lifetime. The application of the nanoparticle labels in an immunoassay yields very good sensitivity technique in biology.1 The labels are often organic dyes that give rise to the usual problems of broad spectral features, short lifetime, photo- bleaching, and potential toxicity to cells. Alternative labels

Hammock, Bruce D.

493

COLLEGE OF CHARLESTON CHARLESTON, SOUTH CAROLINA  

E-Print Network [OSTI]

in the Life Cycle of Parasitic Philometrid Nematodes of the Southern 11.RD NA06OAR4170015 (48) Bleaching Network Information System Effects of Mosquito Abatement Pesticides on Various Life Stages Subcontract Grantor's Total Number Number Expenditures RESEARCH AND DEVELOPMENT CLUSTER: US DEPARTMENT OF AGRICULTURE

Young, Paul Thomas

494

Photostability of dye molecules trapped in solid matrices  

E-Print Network [OSTI]

Photostability of dye molecules trapped in solid matrices Arnaud Dubois, Michael Canva, Alain Brun, Fre´de´ric Chaput, and Jean-Pierre Boilot The photostability of dye molecules trapped in transparent that different trapped dye molecules can absorb on average before they are bleached. Dyes such as Perylene Red

Boyer, Edmond

495

Fruit and Vegetable Safety Challenge Game Directions  

E-Print Network [OSTI]

1 Fruit and Vegetable Safety Challenge Game Directions Equipment needed: 1. Computer, projector (fruits, vegetables, and meat) 6. Cleaning solutions (bleach, soap, water) 7. Stop watch 8. Team prizes How to Start: This game can be used with the "A Healthy Harvest: Safe Handling of Fresh Fruits

496

GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS, VOL. ???, XXXX, DOI:10.1029/, In-situ re-deposition of trace metals mobilized by  

E-Print Network [OSTI]

.1002/ggge.20104 #12;X - 2 WIGLEY ET AL.: TRACE METAL RE-DEPOSITION Abstract. Mobilization of contaminants by CO2-charged brines is one concern relating to injection of CO2 as part of carbon capture and storage of Green River, Utah (USA), where CO2- charged brines have bleached red sandstones, and concentrated trace

Boyer, Edmond

497

Method of digesting an explosive nitro compound  

DOE Patents [OSTI]

The present invention is a process wherein bleaching oxidants are used to digest explosive nitro compounds. The process has an excellent reaction rate for digesting explosives and operates under multivariate conditions. Reaction solutions may be aqueous, non-aqueous or a combination thereof, and can also be any pH, but preferably have a pH between 2 and 9. The temperature may be ambient as well as any temperature above which freezing of the solution would occur and below which any degradation of the bleaching oxidant would occur or below which any explosive reaction would be initiated. The pressure may be any pressure, but is preferably ambient or atmospheric, or a pressure above a vapor pressure of the aqueous solution to avoid boiling of the solution. Because the bleaching oxidant molecules are small, much smaller than an enzyme molecule for example, they can penetrate the microstructure of plastic explosives faster. The bleaching oxidants generate reactive hydroxyl radicals, which can destroy other organic contaminants, if necessary, along with digesting the explosive nitro compound.

Shah, Manish M. (Richland, WA)

2000-01-01T23:59:59.000Z

498

Number Plastic Type Common Items Number of Items (tally) 1 polyethylene terephthalate  

E-Print Network [OSTI]

End Time: Number Plastic Type Common Items Number of Items (tally) 1 polyethylene terephthalate and vegetable oil containers; ovenable food trays. 2 high density polyethylene Milk jugs, juice bottles; bleach, piping, candy wrappers 4 low density polyethylene Squeezable bottles; bread, frozen food, dry cleaning

Schladow, S. Geoffrey

499

SICILY & THE AMALFI COAST FROM $3195 | OCTOBER 3 12, 2014  

E-Print Network [OSTI]

seemingly untouched by time. Discover sun-bleached Greek temples, Roman ruins and ancient theaters amidst and drives is all provided. Detailed travel and destination information to assist in planning Pre-trip gift~TAORMINA MARE Educational focus: History of Sicilian Art and Architecture. Excursion: Taormina. Explore

500

The Ecological Society of America BIOCOMPLEXITY  

E-Print Network [OSTI]

rainforests, bleaching coral reefs, and global warming. How is biocomplexity studied and what are some basic is to understand how com- ponents of the global ecosystem interact with each other in order to gain knowledge of biocomplexity: · nonlinear (including cha otic) behavior · interactions that span multiple levels or space