Selective solvent delignification for fermentation enhancement
作者:
G. C. Avgerinos,
D. I. C. Wang,
期刊:
Biotechnology and Bioengineering
(WILEY Available online 1983)
卷期:
Volume 25,
issue 1
页码: 67-83
ISSN:0006-3592
年代: 1983
DOI:10.1002/bit.260250107
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractCellulose and hemicellulose in renewable biomass resources such as cornstover and wheat straw have been examined as substrates for the production of ethanol. A mixed culture of selected strains ofClostridium thermocellumandClostridium thermosaccharolyticumare used to accomplish both the hydrolysis and fermentation of these carbohydrates in a single step. However, lignin and related phenolic materials are shown to diminish the rate, extent, and yield at which these carbohydrates can be utilized for ethanol production. In order to overcome this problem, a selective solvent pretreatment with alkaline–ethanol–water mixtures was examined for the delignification of cellulosic biomass under conditions where very little loss of fermentable carbohyrates results. Under optimal conditions, up to 67% of the initial lignin in cornstover can be extracted while 95% of the α‐cellulose and pentosan carbohydrates remain insoluble. Subsequent mixed culture fermentation of the treated material has shown a 400% increase in the rate of degradation and greater than 85% utilization of the substrate. The effects of various extraction parameters on delignification kinetics and subsequent fermentation performance are dis
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