摘要
本文研究了在温和的条件下利用四种离子液体对烟梗木质素的提取过程,结果表明1-乙基-3-甲基咪唑磷酸二乙酯盐([EMIM][DEP])的提取效果最佳.通过80℃的热水搅拌30min的预处理过程可以有效脱除烟梗中含有的绝大多数糖分同时疏松了烟梗的微纤维结构,在此基础上使用[EMIM][DEP]在150℃和反应时间4h的条件下可以获得纯度90.21%的木质素,木质素的提取率达到85.38%.
Lignin only accounts for about 6%of total mass in tobacco stem,but it inuences the harmful substances in the side stream smoke of cigarette in a significant way.Traditional researches focus only on the determination of lignin content.In the present work,we investigate four typical imidazolium-based ionic liquids for efficient extraction of lignin under mild conditions and 1-ethyl-3-methylimidazolium diethylphosphate([Emim][DEP])shows the best results.The pretreatment of stem using water at 80℃for 30 min can not only remove most of the sugars but also loose the micro bers.The extractive rate of lignin reaches 85.38%at 150℃for 4 h and the purity of lignin is 90.21%.
作者
范明慧
葛少林
张朝
谢映松
李全新
Ming-hui Fan;Shao-lin Ge;Zhao Zhang;Ying-song Xie;Quan-xin Li(Anhui Key Laboratory of Tobacco Chemistry,China Tobacco Anhui Industrial Co.,LTD,Hefei 230088,China;Department of Chemical Physics,Key Laboratory of Urban Pollutant Conversion,Chinese Academy of Sciences,Anhui Key Laboratory of Biomass Clean Energy,University of Science and Technology of China,Hefei 230026,China)
基金
supported by the China Postdoctoral Science Foundation (BH2060000062)
China Tobacco Anhui Industrial Co.,LTD
关键词
烟梗
预处理
木质素
离子液体
Tobacco stem
Pretreatment
Lignin
Ionic liquid
