Measurement of Infinite Dilution Activity Coefficients of Alcohols, Ketones, and Aromatic Hydrocarbons in 4-Methyl-N-butylpyridinium Tetrafluoroborate and 1-Butyl-3-methylimidazolium Hexafluorophosphate by Gas−Liquid Chromatography

The infinite dilution activity coefficients of C1 to C5 alcohols, acetone, 2-butanone, acetylacetone, toluene, and xylene isomers in 4-methyl-N-butylpyridinium tetrafluoroborate ([bmpy][BF4]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) were measured by gas−liquid chromatography (GC) from (306.6 to 334.8) K and atmospheric pressure. In these measurements with GC, [bmpy][BF4] or [bmim][PF6] was used as a stationary phase. The infinite dilution activity coefficients in this work were not affected by the gas flow rate. It was found that the values of 1-propanol, 1-butanol, and 1-pentanol for the infinite dilution activity coefficients in [bmim][PF6] were larger than those for their isomers. For xylene isomers, the activity coefficients of m-xylene are the largest. The effects of the cation and anion species composing ionic liquid on the activity coefficients were also investigated. The activity coefficients for alcohols, ketones, and aromatic hydrocarbons in the ionic liquids were affect...