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Optimisation of steam pretreatment of SO 2 ‐impregnated mixed softwoods for ethanol production
Author(s) -
Stenberg Kerstin,
Tengborg Charlotte,
Galbe Mats,
Zacchi Guido
Publication year - 1998
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199804)71:4<299::aid-jctb858>3.0.co;2-z
Subject(s) - chemistry , ethanol fuel , ethanol , dry matter , fermentation , hydrolysis , sugar , softwood , enzymatic hydrolysis , residue (chemistry) , yield (engineering) , ethanol fermentation , steam explosion , pulp and paper industry , chromatography , food science , organic chemistry , materials science , agronomy , metallurgy , engineering , biology
Pretreatment of mixed softwoods with SO 2 impregnation and steam for production of ethanol has been investigated. The optimal conditions, both for sugar yield and ethanol yield, to assess the effect of inhibitors formed in the pretreatment, have been determined. The parameters investigated were: SO 2 concentration (1–6% (w/w) dry matter), temperature (190–230°C) and residence time (2–15 min). After pretreatment, the material was separated into a solid residue and a filtrate. The solid residue was enzymatically hydrolysed with 2% dry matter (w/w). To investigate fermentability, the hydrolysed filtrate was fermented using Saccharomyces cerevisiae . The effects of the different parameters are described by response‐surface modelling. The highest experimental sugar yield of 42·1 g per 100 g dry matter was obtained at 210°C and 5·5 min residence time. Although the fermentabilities were good for all filtrates with yields greater than 90% of the yield obtained in a pure glucose reference solution, the pretreatment has a clear influence on the ethanol production rate. © 1998 SCI