Extraction of lignins from aqueous–ionic liquid mixtures by organic solvents
Extraction of lignins from aqueous–ionic liquid mixtures by organic solvents
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DOI：
10.1002/bit.24337
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发表时间：
2012-02
影响因子：
3.8
通讯作者：
Qin Xin;K. Pfeiffer;J. Prausnitz;D. Clark;H. Blanch
中科院分区：
文献类型：
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作者：
Qin Xin;K. Pfeiffer;J. Prausnitz;D. Clark;H. Blanch
通过溶解整个生物质并通过添加水沉淀纤维素来预处理木质纤维素的离子液体（IL）的商业开发由于缺乏从离子液体中回收生物质的木质素含量的有效技术而受到阻碍。研究了三种有机溶剂[乙酸乙酯、1,4-二恶烷和四氢呋喃 (THF)] 与水和乙酸 1-乙基-3-甲基咪唑鎓 ([C2mim][OAc]) 形成双液相系统的能力，以及在两个液相之间分配模型木质素和木质素单体的能力。在 22°C 下获得了三种 [C2mim][OAc]/有机溶剂/水体系的三元图。在这三个系统中测量了几种木质素的分配系数。分配系数随着离子液体相中水含量的增加而增加，并且很大程度上取决于木质素的类型和有机溶剂。随着富离子液体相的 pH 值下降，分配系数上升。小分子模型木质素单体化合物（愈创木酚、丁香醛）也很容易通过 THF 从 IL/水系统中提取。生物技术。生物工程。 2012年； 109：346-352。 © 2011 Wiley 期刊公司。
The commercial development of ionic liquids (ILs) to pretreat lignocellulose by dissolution of whole biomass and cellulose precipitation by addition of water is hindered by the absence of an effective technique to recover the lignin content of the biomass from the IL. Three organic solvents [ethyl acetate, 1,4‐dioxane, and tetrahydrofuran (THF)] were studied for their ability to form a two‐liquid‐phase system with water and 1‐ethyl‐3‐methylimidazolium acetate ([C2mim][OAc]), and for partitioning model lignins and lignin monomers between the two liquid phases. Ternary diagrams were obtained for three [C2mim][OAc]/organic solvent/water systems at 22°C. Partition coefficients were measured for several types of lignin in these three systems. Partition coefficients increase with rising water content in the IL phase, and depend strongly on the type of lignin and on the organic solvent. Partition coefficients rise as the pH of the ionic‐liquid‐rich phase falls. Small molecule model lignin monomer compounds (guaiacol, syringaldehyde) are also readily extracted from the IL/water system by THF. Biotechnol. Bioeng. 2012; 109:346–352. © 2011 Wiley Periodicals, Inc.