Abstract
Activity coefficients at infinite dilution (γi∞) offer a valuable tool for solvent selection in extraction processes. In this study, the γi∞ values for solutes like alkanes, aromatics, and naphthenes in solvents, i.e., ionic liquids N-butyl-4-methylpyridinium tetrafluoroborate [BMPy][BF4], 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, [BMPyr][NTf2], and 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4], were estimated using gas–liquid chromatography at temperatures 313.1, 333.1, and 353.1 K. Partial molar excess enthalpies at infinite dilution (ΔH1E,∞) were evaluated from the γi∞ values. The selectivity for the toluene/n-heptane system was also calculated from the experimentally observed γi∞ and compared to the literature values for well-established industrial solvents sulfolane and N-methyl pyrrolidone.
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