期刊
BIORESOURCE TECHNOLOGY
卷 234, 期 -, 页码 406-414出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.03.081
关键词
Ionic liquids recovery; Biomass pretreatment; Eucalyptus; Enzymatic hydrolysis; Biorefinery
资金
- China Postdoctoral Science Foundation [2016M602305]
- Natural Science Foundation of China [51508213, 51608217, 21607046]
- Key Project of Hubei Provincial Natural Science Foundation [2014CFA109]
- Innovative and Interdisciplinary Team at HUST [0118261077]
- Independent Innovation Foundation of HUST-Exploration Fund [2014TS092, 2016YXMS288]
- National Thousand Young Talents Program
It is urgent to develop recycled ionic liquids (ILs) as green solvents for sustainable biomass pretreatment. The goal of this study is to explore the availability and performance of reusing 1-allyl-3-methylimidazolium chloride ([amim] Cl) and 1-butyl-3-methylimidazolium acetate ([bmim] OAc) for pretreatment, structural evolution, and enzymatic hydrolysis of eucalyptus. Cellulose enzymatic digestibility slightly decreased with the increased number of pretreatment recycles. The hydrolysis efficiencies of eucalyptus pretreated via 4th recycled ILs were 54.3% for [amim] Cl and 72.8% for [bmim] OAc, which were 5.0 and 6.7-folds higher than that of untreated eucalyptus. Deteriorations of ILs were observed by the relatively lower sugar conversion and lignin removal from eucalyptus after 4th reuse. No appreciable changes in fundamental framework and thermal stability of [amim] Cl were observed even after successive pretreatments, whereas the anionic structure of [bmim] OAc was destroyed or replaced. This study suggested that the biomass pretreatment with recycled ILs was a potential alternative for low-cost biorefinery. (C) 2017 Elsevier Ltd. All rights reserved.
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