低共熔溶剂在木质素分离方面的研究进展

A Review of Deep Eutectic Solvents for Lignin Isolation

木质素是自然界中含量丰富的可再生芳香族聚合物,其结构复杂并与碳水化合物之间存在致密连接,这使得木质素难以高效分离。低共熔溶剂(DES)是一种新型绿色离子液体,凭借着独特的物化性质已被成功应用于木质素的溶解和分离。本文从低共熔溶剂溶解木质素及其相关机理出发,综述了低共熔溶剂分离提取木质素的研究进展,重点阐述了木质素在分离提取过程中受DES的组成、配比、酸碱度、官能团,体系的水含量,原料,反应时间、温度,外加催化剂、共熔剂及其他辅助方式的影响,并介绍了DES提取分离所得木质素产物低共熔溶剂木质素(DESL)的结构特征,最后对DES在木质素分离提取方面的研究工作进行了总结与展望。

Lignin is the most abundant renewable aromatic polymer in nature,which complex structure and compact connection with cellulose and hemicellulose through covalent bond and hydrogen bond make it difficult to be separated efficiently.Deep eutectic solvents(DES)is a novel kind of green ionic liquid,which has been successfully applied to lignin isolation due to its unique physical and chemical properties.The research progress of dissolution and extraction of lignin by deep eutectic solvents(DES)is reviewed in detail.From the point of view of the mechanism of dissolving lignin by DES,the effects of different factors(composition,proportion,pH value,functional groups of DES,water content of system,raw material,reaction time,temperature,catalyst,co-solvent,and so on)on lignin removal were emphatically expounded.Based on the research progress of DES in lignin extraction,the research progress and futuer application of lignin extraction were summarized and prospected.