Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

In this work, activity coefficients at infinite dilution have been obtained for 19 polar and non-polar organic solutes in the form of n-alkanes, cycloalkanes, 1-alkenes, 1-alkynes, aromatic compounds, and ketones in the ionic liquid methyl(trioctyl)ammonium thiosalicylate by gas liquid chromatography at three different temperatures, i.e. T = (303.15, 313.15, and 323.15) K. Two columns with different phase loadings of the ionic liquid in the stationary phase (25% and 30%) were employed to obtain activity coefficient at infinite dilution values at each temperature investigated. Partial molar excess enthalpies at infinite dilution were calculated for each of the solutes from the temperature dependency of the activity coefficient at infinite dilution values for the temperature range in this study. Selectivity values at infinite dilution were computed from the activity coefficient at infinite dilutionvalues to screen the potential candidacy of the ionic liquid for the separation of n-hexane/benzene mixtures. The results from this study have been compared to those available for several other classes of ionic liquids and commercial solvents employed in solvent-enhanced industrial separation processes.