期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 210, 期 -, 页码 292-303出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.08.016
关键词
Ionic liquid (IL); Molecular extractant (ME); IL-ME extraction systems; Extraction improvement; Metal separation
资金
- Global Excellent Technology Innovation of the Korea Institute of Energy Technology Evaluation and Planning [KETEP]
- Ministry of Trade, Industry &Energy, Republic of Korea [20165010100810]
Ionic liquids (ILs), also termed green and designer solvents, have been proposed as promising solvents for diverse applications. This review focused on the improvements brought about by mixing ILs with molecular extractants (MEs) in solvent extraction processes for metal extraction and separation. Mixture systems consisting of IL with ME were collected and discussed on the basis of the functional cations of Its, such as ammonium-type, phosphonium-type and imidazolium-type ILs. IL was found to play a role as an active component by generating a new acid/base coupling bi-functional ionic liquid (ABC-BIL) or as a diluent when combined with acidic or neutral ME in IL-ME mixture systems. The merits and drawbacks of IL-ME systems were reviewed and compared with conventional ME systems alone in terms of the preparation route, separation behavior and extraction mechanism. Further approaches to the improvement of IL-ME systems, such as extraction enhancement, stripping and regeneration, were discussed. The summaries and comparisons made in the present review may indicate future directions for the development and application of ILs in metal solvent extraction technology.
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