Liquid鈥揕iquid Extraction of Toluene from n-Alkanes using {[4empy][Tf2N] + [emim][DCA]} Ionic Liquid Mixtures

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• 作者：Marcos Larriba ; Pablo Navarro ; Juli谩n Garc铆a ; Francisco Rodr铆guez
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：May 8, 2014
• 年：2014
• 卷：59
• 期：5
• 页码：1692-1699
• 全文大小：376K
• 年卷期：v.59,no.5(May 8, 2014)
• ISSN：1520-5134

文摘

Ionic liquids (ILs) as replacements of organic solvents currently used in the liquid鈥搇iquid extraction of aromatics could simplify extraction units as a result of their nonvolatile nature, reducing operating costs, and process steps. In this paper, we have studied the liquid鈥搇iquid extraction of toluene from n-hexane, n-octane, and n-nonane using binary mixtures of 1-ethyl-4-methylpyridinium bis(trifluoromethylsulfonyl)imide ([4empy][Tf₂N]) and 1-ethyl-3-methylimidazolium dicyanamide ([emim][DCA]) ILs at 313.2 K. Toluene distribution ratios and toluene/n-alkane selectivities employing the IL mixtures have been intermediate between those of pure ILs. The {[4empy][Tf₂N] + [emim][DCA]} IL mixture with a [4empy][Tf₂N] mole fraction of 0.3 has exhibited higher extractive properties than the sulfolane values. Toluene distribution ratios and toluene/n-alkane selectivities of the mixed ILs have been accurately predicted by the Yalkowsky and Roseman log鈥搇inear mixing rule. Liquid鈥搇iquid equilibria (LLE) data have been correlated to the NRTL model.