Depuydt Daphne, Dehaen Wim, Binnemans Koen
Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan 200F, P.O. Box 2404, 3001, Leuven, Belgium.
Chempluschem. 2017 Mar;82(3):458-466. doi: 10.1002/cplu.201600592. Epub 2017 Feb 8.
Ionic liquids with the docusate (dioctyl sulfosuccinate or DOSS) anion are described. Docusate is incorporated into several phosphonium ionic liquids, including tetrabutylphosphonium and phosphonium cations functionalized with an ester, carboxylic acid, or ethylene glycol group. All synthesized ionic liquids are immiscible with water except the compound with the ethylene glycol moiety in the cation, [P E ][DOSS]. This ionic liquid exhibits a lower critical solution temperature phase behavior upon mixing with water, to yield a homogeneous phase at temperatures below 19 °C, resulting in fast kinetics for homogeneous liquid-liquid extraction. The metal extraction capabilities for both divalent and trivalent metal ions are compared for this thermomorphic ionic liquid and the other hydrophobic docusate ionic liquids in an initial screening test. [P E ][DOSS] is selected to perform separations on the Sm/Co and La/Ni pairs, because of their relevance in the recycling of samarium cobalt magnets and nickel metal hydride batteries. The extraction mechanism is studied, and stripping of the metals is investigated.
本文描述了含有多库酯（二辛基磺基琥珀酸酯或DOSS）阴离子的离子液体。多库酯被引入到几种鏻离子液体中，包括四丁基鏻以及用酯基、羧基或乙二醇基功能化的鏻阳离子。除了阳离子中含有乙二醇部分的化合物[PE][DOSS]外，所有合成的离子液体都与水不混溶。这种离子液体与水混合时表现出较低临界溶液温度的相行为，在低于19°C的温度下形成均相，从而实现均相液 - 液萃取的快速动力学。在初步筛选试验中，比较了这种热致相分离离子液体和其他疏水性多库酯离子液体对二价和三价金属离子的萃取能力。由于[PE][DOSS]在钐钴磁体和镍氢电池回收中的相关性，选择它对Sm/Co和La/Ni对进行分离。研究了萃取机理，并对金属的反萃进行了研究。
