Abstract:

Deep eutectic solvents (DESs) possess properties, as a new generation of green solvent, obtain similar features with ionic liquids, such as low volatility and designable. With the advantages of less expensive and easier preparation, DESs attract much attention in many applications as alternatives to conventional organic solvents, especially in extractive separation of mixtures. In this paper, the development of DESs applied in extraction is introduced. The applications of DESs in liquid-liquid extraction, associative extraction with in situ formation of DESs, and the extraction through DESs decomposition are described. The features and problems of each processes are analyzed. The stability of DES in the processes of extraction and the methods for DES regeneration are introduced. The development of theory for the description of DES and extraction mechanisms are reviewed. Finally, the challenges, for instance, the DESs theory, extraction mechanisms, and cyclic stability are discussed. The industrial applications and further research trend of DESs are prospected.

Key words: deep eutectic solvent, extraction, separation, regeneration, mechanism

摘要：

作为一种新型的绿色溶剂，低共熔溶剂（DES）拥有与离子液体媲美的优良特性，如挥发性小、可设计性等，且具有成本低廉和制备简单的优势，使得DES正逐步替代传统有机溶剂，在萃取分离应用方面得到广泛的关注。本文综述了近年来国内外有关DES在萃取分离方面的研究报道，阐述了DES直接用于液液萃取、在线生成DES的缔合萃取和通过DES分解完成萃取的应用，并分析比较了各过程的特点和存在的问题；介绍了DES在不同萃取体系中的稳定性和DES的回收方法；总结了DES萃取分离体系的理论发展和萃取机理的研究进展；展望了DES用于萃取分离的工业化前景，指出了目前面临的DES理论、萃取机理、循环稳定性等方面的挑战，分析了进一步的研究趋势。

关键词: 低共熔溶剂, 萃取, 分离, 再生, 机理