Journal
BIORESOURCE TECHNOLOGY
Volume 96, Issue 18, Pages 1994-2006Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2005.01.014
Keywords
lime; pretreatment; enzymatic hydrolysis; pile; oxidative; non-oxidative; corn stover
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Corn stover was pretreated with an excess of calcium hydroxide (0.5 g Ca(OH)(2)/g raw biomass) in non-oxidative and oxidative conditions at 25, 35, 45, and 55 degrees C. The optimal condition is 55 degrees C for 4 weeks with aeration. Glucan (91.3%) and xylan (51.8%) were converted to glucose and xylose respectively, when the treated corn stover was enzymatically hydrolyzed with 15 FPU/g cellulose. Only 0.073 g Ca(OH)(2) was consumed per g of raw corn stover. Of the initial lignin, 87.5% was maximally removed. Almost all acetyl groups were removed. After 4 weeks at 55 degrees C with aeration, some cellulose and hemicellulose were solubilized as monomers and oligomers in the pretreatment liquor. When considering the dissolved fragments of glucan and xylan in the pretreatment liquor, the overall yields of glucose and xylose were 93.2% and 79.5% at 15 FPU/g cellulose. The pretreatment liquor has no inhibitory effect on ethanol fermentation. (c) 2005 Published by Elsevier Ltd.
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