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Report on the status of wood saccharification by the Scholler process (in German)

Technical Report ·
OSTI ID:5219293
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The Scholler process produced xylose (wood sugar) from wood chips and sawdust. The xylose was used to grow yeast or changed to alcohol or other sugars. This report was an evaluation of the optimal operation of the process for purposes of making an overall cost analysis of the process for comparison with other processes. Much information was given on setup costs, operational costs, prices for products, possible improvements to the process and their cost/benefit comparisons, etc. This report finally recommended the Scholler process above all contemporary competing processes. The process began by packing sawdust or wood chips tightly into a retort, pressurizing the retort to 10 atm and heating it to 150/sup 0/C, then passing a 0.8% sulfuric acid solution heated to 110 to 130/sup 0/C periodically through the retort to dissolve out the sugar from the lignin. The retorts were made of iron, but lined with two layers of leaded acid-resistant brick. Sulfuric acid solution was passed through the retort every 45 minutes or so for 10 to 14 hours, then filtered through porous brick and pumped into wooden vats for separation of the sugar. After the last pass-through of acid, the lignin remaining in the retort was pressed out of the bottom of the retort through a centrifuge and then could be used directly as a fuel for heating the apparatus. The sugar-sulfuric acid solution was heated for a time in the vats to break up any remaining polymers of the sugar, then neutralized with calcium carbonate and calcium oxide, then pressed through filters to remove solids. During the run described, a yield of about 51% reducing sugar by weignt of dry wood substances was obtained with the sugar in a 3.5% solution.
Research Organization:
I.G. Farbenindustrie, Ludwigshafen (Germany)
OSTI ID:
5219293
Report Number(s):
TOM-302-3005-3017
Country of Publication:
United States
Language:
German

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Related Subjects

09 BIOMASS FUELS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
ACID HYDROLYSIS
ALCOHOLS
ALDEHYDES
BIOMASS
CARBOHYDRATES
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMPARATIVE EVALUATIONS
COST BENEFIT ANALYSIS
DATA COMPILATION
DECOMPOSITION
ECONOMICS
ENERGY SOURCES
EXTRACTION
FILTRATION
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROLYSIS
HYDROXY COMPOUNDS
INORGANIC ACIDS
INSPECTION
LIGNIN
LYSIS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
MONOSACCHARIDES
ORGANIC COMPOUNDS
PENTOSES
POLYSACCHARIDES
PRODUCTION
RENEWABLE ENERGY SOURCES
RETORTS
SACCHARIDES
SEPARATION PROCESSES
SINGLE CELL PROTEIN
SOLID WASTES
SOLVOLYSIS
SULFURIC ACID
WASTES
WOOD
WOOD WASTES
XYLOSE