The objective of this study is to develop ionic liquids (ILs) derived from organophosphorus acids, featuring thermomorphic phase behavior tailored for homogeneous liquid–liquid extraction applications, addressing the challenges posed by the high viscosity of ILs. The novelty of our work includes a logP‐based guideline for designing thermomorphic water/organophosphorus IL solvent systems and a proof‐of‐concept study on homogeneous liquid–liquid extraction applications. Specifically, we reported a series of novel ILs exhibiting lower critical solution temperature behavior in aqueous solutions by exploring various combinations of tetraalkylammonium cations with organophosphorus acid‐based anions. Practical applications utilizing this type of thermomorphic solvent system for extracting metal ions and acids were demonstrated. The benefits of homogeneous extraction, as well as the limitations stemming from the salting‐out effect, were presented and discussed.

中文翻译：

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开发源自有机磷酸的热形态离子液体，用于均相萃取工艺


本研究的目的是开发从有机磷酸衍生的离子液体 （IL），具有为均相液-液萃取应用量身定制的热晶相行为，解决了 IL 高粘度带来的挑战。我们工作的新颖性包括用于设计热形态水/有机磷 IL 溶剂系统的基于 logP 的指南，以及关于均相液-液萃取应用的概念验证研究。具体来说，我们通过探索四烷基铵阳离子与有机磷酸基阴离子的各种组合，报道了一系列在水溶液中表现出较低临界溶液温度行为的新型 ILs。展示了利用这种类型的热形态溶剂系统提取金属离子和酸的实际应用。介绍并讨论了均相萃取的好处以及盐析效应带来的局限性。