Feasibility of ionic liquids as alternative separation media for industrial solvent extraction processes
Feasibility of ionic liquids as alternative separation media for industrial solvent extraction processes
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DOI：
10.1021/ie049050t
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发表时间：
2005-06-08
影响因子：
4.2
通讯作者：
Goto, M
中科院分区：
文献类型：
--
作者：
Nakashima, K;Kubota, F;Goto, M
以辛基苯基-N，N-二异丁基氨甲酰基甲基氧化膦（CMPO）为萃取剂，研究了离子液体（ILs）从水溶液中萃取稀土金属。离子液体的使用大大提高了CMPO的萃取效率和金属离子的选择性相比，当正十二烷被用作萃取溶剂。通过斜率分析和萃取试验研究了萃取机理，证实了金属萃取是通过阳离子交换机理进行的。此外，通过络合剂将金属从离子液体中反萃到水相中，并成功地实现了萃取离子液体相的循环。
Extraction of rare earth metals into ionic liquids (ILs) from aqueous solutions was investigated using octyl(phenyl)-N,N-diisobutylcarbamoylmethyl phosphine oxide (CMPO) as an extractant. Use of ILs greatly enhanced the extraction efficiency and selectivity of CMPO for metal ions compared to when n-dodecane was used as the extracting solvent. The extraction mechanism has been studied by slope analysis and extraction tests, and these confirmed that the metal extraction proceeds via a cation-exchange mechanism. Furthermore, stripping of metals from ILs into an aqueous phase by complexing agents and recycling of the extracting ILs phase was successfully accomplished.