title: Accurate measurements of thermodynamic properties of solutes in ionic liquids using inverse gas chromatography.
abstract: Activity coefficients at infinite dilution of 29 organic compounds in two room temperature ionic liquids were determined using inverse gas chromatography. The measurements were carried out at different temperatures between 323.15 and 343.15K. To establish the influence of concurrent retention mechanisms on the accuracy of activity coefficients at infinite dilution for 1-butyl-3-methylimidazolium octyl sulfate and 1-ethyl-3-methylimidazolium tosylate, phase loading studies of the net retention volume per gram of packing as a function of the percent phase loading were used. It is shown that most of the solutes are retained largely by partition with a small contribution from adsorption on 1-butyl-3-methylimidazolium octyl sulfate and that the n-alkanes are retained predominantly by interfacial adsorption on 1-ethyl-3-methylimidazolium tosylate.
authors.affiliation: Institut National Polytechnique de Lorraine, Ecole Nationale Supérieure des Industries Chimiques, Laboratoire de Thermodynamique des Milieux Polyphasés, 1 rue Grandville, Nancy 54000, France. mutelet@ensic.inpl-nancy.fr
authors.forename: Fabrice
authors.initials: F
authors.lastname: Mutelet
authors.forename: Jean-Noël
authors.initials: JN
authors.lastname: Jaubert
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D015203:Reproducibility of Results; D012997:Solvents; D013816:Thermodynamics
chemical_list: D012997:Solvents