Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

New isoquinolinium ionic liquid has been synthesized from N-octylisoquinolinium bromide as a substrate. The specific basic characterization of the new compound by NMR spectra, elementary analysis and water content is presented. The activity coefficients at infinite dilution, for 37 solutes viz. alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, ethers, ketones, and water in the ionic liquid N-octylisoquinolinium bis{(trifluoromethyl)sulfonyl}imide [C8iQuin][NTf2], were determined by gas liquid chromatography at the temperatures from (328.15 to 368.15) K. The partial molar excess enthalpies at infinite dilution values were calculated from the experimental activity coefficients at infinite dilution, obtained over the temperature range. The selectivity for the n-hexane/benzene, cyclohexane/benzene and n-heptane/thiophene separation problems were calculated from the activity coefficients at infinite dilution and compared to the other ionic liquids with bis{(trifluoromethyl)sulfonyl}imide anion, NMP and sulfolane, taken from the recent literature. The chosen ionic liquid demonstrates that it is possible to separate different organic compounds with the average selectivity and capacity.