4-硝基苯并-15-冠醚-5液液萃取分离锂同位素  

Separation of Lithium Isotopes by Liquid-Liquid Extraction of 4-Nitrobenzo-15-Crown Ether–5

作　　者：王苏 贾永忠[1] 王兴权[1] 肖江[1,2] 姚颖 张全友[1] 景燕 WANG Su;JIA Yong-zhong;WANG Xing-quan;XIAO Jiang;YAO Ying;ZHANG Quan-you;JING Yan(Key Lab of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室,青海西宁810008 [2]中国科学院大学,北京100049

出　　处：《盐湖研究》2019年第3期62-67,共6页Journal of Salt Lake Research

基　　金：国家自然科学盐湖专项基金(U1407117)

摘　　要：以4-硝基苯并-15-冠醚-5(4-NO2-B15C5)做萃取剂,苯甲醚和1-丁基-3-甲基咪唑双(三氟甲烷磺酰)亚胺盐([C4mim][NTf2])作稀释剂和协萃剂,以1 mol/L LiCl溶液作萃取溶剂,构建高效的冠醚—离子液体/锂盐溶液的溶剂萃取体系。重点考察了有机相组成、冠醚浓度和锂盐阴离子等对锂同位素分离的影响。结果表明,4-硝基苯并-15-冠醚-5具有良好的锂同位素分离效果,在萃取CF3COOLi时最大单级分离系数(α)可达1.043±0.01。In this work,an noval and efficient solvent extraction system containing crown ether,ionic liquid and lithium salt solution was composed.4-nitrobenzo-15-crown-5,1-butyl-3-methylimidazolebis(trifluoromethanesulfonyl)imide[C 4mim[NTf2])and anisole were used as a extraction agent,synergetic and diluent solvent,respectively and applied to separation lithium isotopes form 1 mol/L LiCl solution.The effects of organic phase composition,crown ether concentration,anion effect on lithium isotope separation were investigated.The results showed that 4-nitrobenzo-15-crown-5 have a good lithium isotope separation ability,and the largest single-stage separation factor(α)was 1.043±0.01 when extracting LiCF3COO.

关 键 词：锂同位素 4-硝基苯并-15-冠醚-5 溶剂萃取 分离 离子液体 

分 类 号：TQ028.8[化学工程]