Abstract
This work is a continuation 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, γ13∞ 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 γ13∞ the basic thermodynamic function, that is partial molar excess Gibbs free energies, ΔG1E,∞, enthalpies ΔH1E,∞ and entropies TrefΔS1E,∞ 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 γ13∞ and compared to the studies from the recent literature for other ionic liquids.
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