(Liquid + liquid) equilibria of {benzene + cyclohexane + two ionic liquids} at different temperature and atmospheric pressure

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• 作者：Salem A. Sakal^a ; ^b ; Chong Shen^a ; ^c ; Chun-xi Li^a ; ^b ; ^{Licx@mail.buct.edu.cn}
• 关键词：(Liquid&#xA0 ; +&#xA0 ; liquid) equilibria ; Ionic liquids ; NTRL ; Benzene ; Cyclohexane
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2012
• 期刊代码：123_00219614
• 类别：ch
• 出版时间：June, 2012
• 卷：49
• 期：Complete
• 页码：81-86
• 文件大小：354 K

摘要

(Liquid + liquid) equilibrium data of the following ternary and quaternary systems at different temperatures and mass fractions of ionic liquids (ILs) were measured at atmospheric pressure, i.e., {cyclohexane + benzene + 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP])} at 298.2 K, {cyclohexane + benzene + 1-methylimidazolium tetrafluoroborate ([MIM][BF₄])} at 338.2 K, {cyclohexane + benzene + [MIM][BF₄] + [MMIM][DMP]} at (298.2 and 313.2) K, and {cyclohexane + benzene + 1-methylimidazolium perchlorate [MIM][ClO₄] + [MMIM][DMP]} at 298.2 K. The results indicate that both selectivity and distribution factor of the IL mixture for benzene are lower than that of pure IL [MMIM][DMP] at a specified condition, and decrease with the increase of the mass fraction of [MIM][BF₄] or [MIM][ClO₄] in its mixture of [MMIM][DMP] and the mole fraction of benzene. The extremely high selectivity of [MIM][BF₄] and [MIM][ClO₄] for aromatic compounds as predicted by the COSMOS-RS model is not justified by the present experimental results, and on the contrary, they show a relatively lower selectivity and extraction capacity for benzene than [MMIM][DMP].