Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

This work is acontinuation of our research of ionic liquids (ILs) to investigate the possibility of using them as a solvent for the separation processes, especially for extraction of aromatic from aliphatic hydrocarbons. New data of the activity coefficients at infinite dilution, gamma13 were determined for 53 solutes including: n-alkanes, alk-1-enes, alk-1-ynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, acetonitrile, pyridine, 1-nitropropane and water in the ionic liquid: N-hexylisoquinolinium thiocyanate, [HiQuin][SCN] using inverse gas chromatography at wide range of temperature from (308.15 to 368.15)K.From the temperature dependence of gamma13 the basic thermodynamic function, that is partial molar excess Gibbs free energies, DGE1, enthalpies DHE1 and entropies TrefDSE1 at infinite dilution were calculated at a wide temperature range. Additionally the gas liquid partition coefficients, KL were determined.The selectivities for n-heptane/toluene, cyclohexane/benzene, n-heptane/xylenes separation problems were calculated directly from the experimental values of gamma13 and compared to the studies from the recent literature for other ionic liquids.