Development of thermomorphic ionic liquids derivedfrom organophosphorus acids for homogeneousextraction processes
作者：Xiaorui Zhu, Lingyu Zhu, Jianli Wang, Jiayuan Wang
關鍵字：COSMO, extraction, ionic liquid, LCST, salting-out
論文來源：期刊
具體來源：AICHE JOURNAL
發(fā)表時間：2024年
本研究旨在開發(fā)一類基于有機膦酸的新型離子液體（ILs），其特有的熱致相變行為可精準適配均相液液萃取需求，旨在解決傳統(tǒng)離子液體高粘度帶來的應用限制。本工作的創(chuàng)新性體現(xiàn)在兩方面：（1）建立了基于logP參數(shù)的溶劑設計準則，用于構建熱致相變型水/有機膦酸離子液體體系；（2）完成了該體系在均相液液萃取領域的原理驗證研究。具體而言，本研究通過系統(tǒng)探索四烷基銨陽離子與有機膦酸基陰離子的多種組合，成功制備出系列新型離子液體，該系列材料在水溶液中展現(xiàn)出獨特的低臨界溶解溫度（LCST）特性。進一步通過金屬離子與酸性物質(zhì)的萃取案例，實證了此類熱致相變?nèi)軇w系的實際應用效能。研究同時深入探討了均相萃取模式的技術優(yōu)勢及其受鹽析效應制約的局限性。
The objective of this study is to develop ionic liquids (ILs) derived from organophos-phorus acids, featuring thermomorphic phase behavior tailored for homogeneousliquid–liquid extraction applications, addressing the challenges posed by the high vis-cosity of ILs. The novelty of our work includes a logP-based guideline for designingthermomorphic water/organophosphorus IL solvent systems and a proof-of-conceptstudy on homogeneous liquid–liquid extraction applications. Specifically, we reporteda series of novel ILs exhibiting lower critical solution temperature behavior in aque-ous solutions by exploring various combinations of tetraalkylammonium cations withorganophosphorus acid-based anions. Practical applications utilizing this type of ther-momorphic solvent system for extracting metal ions and acids were demonstrated.The benefits of homogeneous extraction, as well as the limitations stemming fromthe salting-out effect, were presented and discussed.
圖1 基于熱致相變?nèi)軇w系的均相液液萃取（HLLE）工作原理示意圖，分別展示：(A) 具有上臨界溶液溫度（UCST）行為；(B) 具有下臨界溶液溫度（LCST）行為的溶劑體系。