Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

The activity coefficients at infinite dilution and gas-liquid partition coefficients for 46 solutes: alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, acetic acid, and water in the ionic liquid 1-(3-hydroxypropyl)pyridinium bis(trifluoromethylsulfonyl) amide were determined by gas-liquid chromatography at the temperatures from (308.15 to 378.15) K. The partial molar excess Gibbs free energies, enthalpies and entropies at infinite dilution were calculated from the experimental activity coefficients at infinite dilution values obtained over the temperature range. The selectivities for aliphatic/ aromatic hydrocarbons separation problem were calculated from the activity coefficients at infinite dilution and compared to the literature values for other ionic liquids based on bis(trifluoromethylsulfonyl) amide anion, NMP and sulfolane. It was found that the investigated ionic liquid shows much higher selectivity at infinite dilution than the general used organic solvents such as NMP, sulfolane and other ionic liquids. Additionally the selectivities for selected compounds which form azeotropic mixtures were calculated.