木质素
氯化胆碱
木质纤维素生物量
化学
芒属
甲酸
生物量(生态学)
草酸
生物净化
萃取(化学)
环境友好型
生物燃料
核化学
有机化学
生物炼制
原材料
生物能源
废物管理
工程类
地质学
海洋学
生物
生态学
作者
Kirtika Kohli,Sarmila Katuwal,Atanu Biswas,Brajendra K. Sharma
标识
DOI:10.1016/j.biortech.2020.122897
摘要
To establish an environmentally friendly and cheaper method to delignify lignocellulosic biomass feedstocks, deep eutectic solvents (DESs) were investigated as a green alternatives to conventional solvents. Six different DESs were facilely prepared and used to delignify miscanthus and birchwood feedstocks, including monocarboxylic acid/choline chloride (ChCl), dicarboxylic acid/ChCl and polyalcohol/ChCl. The enhanced delignification efficiency was evaluated in relation to the nature of the hydrogen bond donors and acid strength of DES. The largest extraction of lignin from the miscanthus and birchwood was achieved using ChCl.formic acid and ChCl.oxalic acid DES, respectively. The TGA and 13C NMR characterization results of the extracted lignin samples indicated that the different types of lignin were produced using different DESs. The reaction optimization results showed an increase in lignin extraction with increasing temperature from 60 to 130 °C. However, the optimal reaction time was different, 30 min for miscanthus and 60 min for birchwood. A convenient and reliable method for the quantification of lignin was developed using UV–Vis spectrophotometry.
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