Lowering kraft black liquor viscosity of ultrafiltration
Conference
·
· Sep. Sci. Technol.; (United States)
OSTI ID:5995878
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.
- Research Organization:
- Univ. of Maine, Orono, ME (USA)
- OSTI ID:
- 5995878
- Report Number(s):
- CONF-871038-
- Conference Information:
- Journal Name: Sep. Sci. Technol.; (United States) Journal Volume: 23:12,13
- Country of Publication:
- United States
- Language:
- English
Similar Records
Multivalent ion removal from Kraft black liquor by ultrafiltration
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Journal Article
·
Tue Sep 01 00:00:00 EDT 1987
· Ind. Eng. Chem. Res.; (United States)
·
OSTI ID:5854405
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Technical Report
·
Tue Oct 01 00:00:00 EDT 1985
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OSTI ID:6451252
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Technical Report
·
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·
OSTI ID:6300630
Related Subjects
09 BIOMASS FUELS
090122 -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
CARBOHYDRATES
DATA
DISPERSIONS
EXPERIMENTAL DATA
FILTRATION
FLOW RATE
INFORMATION
LIGNIN
MEDIUM TEMPERATURE
MEMBRANES
MIXTURES
MOLECULAR WEIGHT
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PERFORMANCE
POLYMERS
POLYSACCHARIDES
SACCHARIDES
SEPARATION PROCESSES
SLURRIES
SULFONES
SUSPENSIONS
TEMPERATURE DEPENDENCE
ULTRAFILTRATION
VELOCITY
VISCOSITY
090122 -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
CARBOHYDRATES
DATA
DISPERSIONS
EXPERIMENTAL DATA
FILTRATION
FLOW RATE
INFORMATION
LIGNIN
MEDIUM TEMPERATURE
MEMBRANES
MIXTURES
MOLECULAR WEIGHT
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PERFORMANCE
POLYMERS
POLYSACCHARIDES
SACCHARIDES
SEPARATION PROCESSES
SLURRIES
SULFONES
SUSPENSIONS
TEMPERATURE DEPENDENCE
ULTRAFILTRATION
VELOCITY
VISCOSITY