期刊
BIORESOURCE TECHNOLOGY
卷 117, 期 -, 页码 25-32出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.04.062
关键词
Fractionating pretreatment; Organosolv delignification; Alkaline deformylation; Enzymatic hydrolysis; Cellulose digestibility
资金
- National Natural Science Foundation of China [21106081]
- National Basic Research Program of China (973 Program) [2011CB707406]
- Ministry of Science and Technology of China [2010DFB40170]
A lignocellulose pretreatment process was developed with formic acid delignification (FAD) followed by alkaline deformylation (AD), which was termed as Formiline process. In FAD, more than 80% of lignin and hemicellulose were removed, but cellulose formylation also happened. Formic acid concentration (FAC) was the most important factor affecting delignification and cellulose formylation. Increasing FAC could enhance degree of delignification but also increased cellulose formylation. The presence of formyl group could inhibit the enzymatic hydrolysis of cellulose: however, removing formyl group with a small loading of alkali well recovered cellulose digestibility. The spent liquor could be directly recycled for delignification thus significantly decreasing energy consumption in solvent recovery. The Formiline-pretreated substrates showed an excellent enzymatic digestibility and could be very well converted to ethanol by simultaneous saccharafication and fermentation (SSF). The final ethanol concentrations were 55.4 and 80.1 g/L respectively at initial solid consistencies of 15% and 20%. (C) 2012 Elsevier Ltd. All rights reserved.
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