Determination of Activity Coefficients at Infinite Dilution of Solutes in the Ionic Liquid 1-Hexyl-3-methylimidazolium Tetrafluoroborate Using Gas−Liquid Chromatography at the Temperatures 298.15 K and 323.15 K

The activity coefficients at infinite dilution,, for both polar and nonpolar solutes in an ionic liquid, 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM + ][BF 4 - ]), have been determined by gas−liquid chromatography at T = (298.15 K and 323.15 K). This work is part of our research focus on ionic liquids. The selectivity values have been calculated at T = 298.15 K, and the results indicate that the ionic liquid, [HMIM + ][BF 4 - ], should be a good solvent for separation of benzene and alkanes. The partial molar excess enthalpy values at infinite dilution have also been determined at T = 298.15 K and have been discussed in terms of intermolecular interactions. The results have been discussed in terms of measurements of, using other ionic liquids, taken from the recent literature.