Liquid−Liquid Equilibria in Binary Mixtures Containing Fluorinated Benzenes and Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide
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- 作者：Mark B. Shiflett ; A. Yokozeki
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2008
- 出版时间：November 13, 2008
- 年：2008
- 卷：53
- 期：11
- 页码：2683-2691
- 全文大小：355K
- 年卷期：v.53,no.11(November 13, 2008)
- ISSN：1520-5134
文摘
Binary liquid−liquid equilibria in mixtures of fluorinated benzenes and ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([emim][Tf2N]), have been measured using the volumetric method over a temperature range from about (283 to 373) K. A general trend between the magnitude of the dipole moment (polarity) and the miscibility was found, although other intermolecular interactions (higher-order moments, π-electron effects, and hydrogen bonding) may also be playing a role for a more detailed trend. The fluorinated benzenes having the largest dipole moments (1,2-difluorobenzene, 1,2,3,4-tetrafluorobenzene, and 1,2,3-trifluorobenzene) were completely miscible in the [emim][Tf2N]. The binary systems (1,4-difluorobenzene, 1,3,5-trifluorobenzene, and 1,2,4,5-tetrafluorobenzene) with zero dipole moments, and the binary systems (1,2,4-trifluorobenzene, fluorobenzene, 1,3-difluorobenzene, pentafluorobenzene, and 1,2,3,5-tetrafluorobenzene) with dipole moments of about 1.4 D were only partially miscible in [emim][Tf2N] (immiscibility gaps from about (11 to 50) mol % in [emim][Tf2N]). The binary system (1,2,4-trifluorobenzene + [emim][Tf2N]) shows a lower critical solution temperature (LCST) of about 354 K. The excess molar volumes range from (−1 to −10) cm3·mol−1. Observed LLE are well correlated by use of the nonrandom two liquid (NRTL) solution model.