文献类型：期刊文献

英文题名：Rational design of double salt ionic liquids as extraction solvents: Separation of thiophene/n-octane as example

作者：Song, Zhen[1];Hu, Xutao[2];Zhou, Yageng[1];Zhou, Teng[1];Qi, Zhiwen[2];Sundmacher, Kai[1,3]

机构：[1]Max Planck Inst Dynam Complex Tech Syst, Proc Syst Engn, Sandtorstr 1, D-39106 Magdeburg, Germany;[2]East China Univ Sci & Technol, Max Planck Partner Grp, State Key Lab Chem Engn, Sch Chem Engn, Shanghai, Peoples R China;[3]Otto von Guericke Univ, Proc Syst Engn, Magdeburg, Germany

年份：2019

卷号：65

期号：8

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20192106961616);WOS:【SCI-EXPANDED(收录号:WOS:000474620800012)】；

基金：Natural Science Foundation of China, Grant/Award Numbers: 21406063, 21776074

语种：英文

外文关键词：COSMO-RS; double salt ionic liquids; liquid-liquid equilibrium; solvent design; thiophene; n-octane separation

摘要：Although double salt ionic liquids (DSILs) offer significant advantages over classical two-ion ionic liquids as separation solvents, relevant studies are still scarce and a systematic DSIL selection method is thus highly desirable. In this contribution, a rational method for designing DSILs as extraction solvents is proposed and exemplified by the thiophene/n-octane separation. The effects of additional degrees of freedom for DSIL design (i.e., double cations and/or anions and the ion ratio) on the thermodynamic properties are first analyzed by COSMO-RS. Then, a multilevel DSIL design method combining the prediction of infinite dilution thermodynamic properties, the estimation of physical properties, the evaluation of phase equilibrium behavior, and the experimental validation is proposed. By applying this method, [C(2)MIm][OAc](x)[NO3](1-x) (x = [0, 1]) and [C(2)MIm][OAc](x)[SCN](1-x) (x = [0.70, 1]) are identified as promising DSIL solvents for the thiophene/n-octane separation. Correspondingly, the liquid-liquid equilibria of {DSILs + thiophene + n-octane} with the designed DSILs are experimentally studied.