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Title:
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Pretreatment and Fractionation of Wheat Straw by an Acetone-Based Organosolv Process
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Author(s):
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Published by:
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Publication date:
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ECN
Biomass, Coal and Environmental Research
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18-10-2010
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ECN report number:
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Document type:
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ECN-W--10-047
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Article (scientific)
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Number of pages:
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10
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Published in: Ind. Eng. Chem. Res. (), , 2010, Vol.49, p.10132-10140.
Abstract:
Acetone-based organosolv fractionation of wheat straw was studied to produce sugars and lignin in a lignocellulose biorefinery. The influence of acetone-water ratio, reaction time, and temperature on fractionation degree, lignin yield, and enzymatic digestibility of the cellulose fraction was examined. The solvent-water ratio was found to influence delignification and hemicellulose hydrolysis by its effect on lignin solubility and pH. Organosolv treatment in 50:50% w/w acetone-water during 1 h at 205 ?C resulted in 82% hemicelluloses hydrolysis, 79% delignification, and 93% cellulose recovery. A substantial part of the sugars formed upon hemicellulose hydrolysis seems to have reacted further including possible formation of lignin-furfural condensation products. Finally, aqueous acetone pretreatment was found to substantially improve the enzymatic digestibility of the cellulose fraction (glucose yield: up to 87% vs 16% for untreated wheat straw).
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