Abstract Phenolic compounds are important basic materials for the organic chemical industry, such as pesticides, medicines and preservatives. Phenolic compounds can be obtained from biomass, coal and petroleum via pyrolysis and liquefaction, but they are mixtures in oil. The traditional methods to separate phenols from oil using alkaline washing are not environmentally benign. To solve the problems, deep eutectic solvents (DESs) and ionic liquids (ILs) have been developed to separate phenols from oil, which shows high efficiency and environmental friendliness. In this article, we summarized the properties of DESs and ILs and the applications of DESs and ILs in the separation of phenols and oil. There are two ways in which DESs and ILs are used in these applications: (1) DESs formed in situ using different hydrogen bonding acceptors including quaternary ammonium salts, zwitterions, imidazoles and amides; (2) DESs and ILs used as extractants. The effect of water on the separation, mass transfer dynamics in the separation process, removal of neutral oil entrained in DESs, phase diagrams of phenol + oil + extractant during extraction, are also discussed. In the last, we analyze general trends for the separation and evaluate the problematic or challenging aspects in the separation of phenols from oil mixtures.

中文翻译：

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使用低共熔溶剂和离子液体从油中分离酚类

摘要 酚类化合物是农药、医药、防腐剂等有机化工的重要基础原料。酚类化合物可以从生物质、煤和石油中通过热解和液化获得，但它们是油中的混合物。使用碱性洗涤从油中分离酚类的传统方法对环境不利。为了解决这些问题，人们开发了深共熔溶剂（DESs）和离子液体（ILs）来从油中分离酚类，具有高效和环保的特点。在本文中，我们总结了 DESs 和 ILs 的性质以及 DESs 和 ILs 在分离酚类和油类中的应用。在这些应用中，DES 和 IL 有两种使用方式：(1) 使用不同的氢键受体原位形成的DESs，包括季铵盐、两性离子、咪唑和酰胺；(2) DESs 和ILs 用作萃取剂。还讨论了水对分离的影响、分离过程中的传质动力学、DESs 中夹带的中性油的去除、萃取过程中苯酚 + 油 + 萃取剂的相图。最后，我们分析了分离的总体趋势，并评估了从油混合物中分离酚类的问题或具有挑战性的方面。