Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

In this work, the activity coefficients at infinite dilution oc113P for 14 solutes: alkanes, alkenes, an alkyne, cycloalkanes, benzene, and methanol in the ionic liquid 1-methyl-3-octyl-imidazolium ethyleneglycolmonomethylethersulfate were determined by gas + liquid chromatography at the temperatures (288.15, 298.15, and 313.15) K. The ionic liquid had a mass percentage packing greater than 20%. Two columns with different mass percent packing of the ionic liquid were studied at each temperature. The activity coefficient at infinite dilution oc113P for each solute was used to calculate the excess molar enthalpies at infinite dilution oDHE1 m P. The selectivity value for the hexane/benzene separation was calculated from the c113 and compared to the literature values for other ionic liquids and N-methyl pyrrolidone. Gas + liquid chromatography is a simple, accurate, and reliable method that requires small quantities of the liquid support and solutes.