1-Alkyl-2,3-dimethylimidazolium Bis(trifluoromethylsulfonyl)imide Ionic Liquids for the Liquid鈥揕iquid Extraction of Toluene from Heptane

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• 作者：Silvia Garci虂a ; Marcos Larriba ; Julia虂n Garci虂a ; Jose虂 S. Torrecilla ; Francisco Rodri虂guez
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：August 11, 2011
• 年：2011
• 卷：56
• 期：8
• 页码：3468-3474
• 全文大小：860K
• 年卷期：v.56,no.8(August 11, 2011)
• ISSN：1520-5134

文摘

The liquid鈥搇iquid equilibria (LLE) of three ternary systems formed by toluene, heptane, and 1-alkyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids {[xdmim][Tf₂N], where x refers to ethyl (e), propyl (p), or butyl (b)} were determined at T = 313.2 K and atmospheric pressure. The methyl group in position 2 in the imidazolium cation seems to improve the selectivity of the liquid鈥搇iquid extraction process of toluene from heptane compared to the results previously obtained for 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids {[xmim][Tf₂N], where x refers to ethyl (e), propyl (p), or butyl (b)}. [edmim][Tf₂N] and [pdmim][Tf₂N] ILs seem to be alternatives for sulfolane in the extraction of toluene from heptane. The experimental LLE data were satisfactorily correlated by means of the thermodynamic nonrandom two-liquid (NRTL) model.