Application of [HMim][NTf2], [HMim][TfO] and [BMim][TfO] ionic liquids on the extraction of toluene from alkanes: Effect of the anion and the alkyl chain length of the cation on the LLE

作者：Corderi Sandra; Gonzalez Emilio J; Calvar Noelia; Dominguez Angeles^*

来源：Journal of Chemical Thermodynamics, 2012, 53: 60-66.

DOI：10.1016/j.jct.2012.04.015

• Ionic liquids
• Liquid-liquid equilibrium
• Toluene
• Heptane
• Cyclohexane

In this paper, the separation of toluene from the aliphatic hydrocarbons heptane and cyclohexane employing the ionic liquids 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [HMim][NTf2], 1-hexyl-3-methylimidazolium trifluoromethanesulfonate, [HMim][TfO] and 1-butyl-3-methylimidazolium trifluoromethanesulfonate, [BMim][TfO], as solvents was studied and discussed. Liquid-liquid equilibrium data for the ternary systems {heptane, or cyclohexane + toluene + [HMim][NTf2], or [HMim][TfO], or [BMim][TfO]} and {heptane + cyclohexane + [HMim][NTf2], or [HMim][TfO], or [BMim][TfO]} were measured at T = 298.15 K and atmospheric pressure. The degree of consistency of the tie-lines was tested using the Othmer-Tobias equation. The solute distribution ratio and selectivity, derived from the experimental tie-lines, were used to determine if these ionic liquids can be used as potential solvents on the extraction of toluene from aliphatic hydrocarbons; a comparison with literature data where sulfolane is used as solvent was also included. Finally, the experimental data were correlated with the NRTL and UNIQUAC thermodynamic models.

• 出版日期2012-10