Activity coefficients of 42 to 54 organic compounds in the four ionic liquids (ILs) 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate, 1-butyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide, 1,3-didecyl-2-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-ethyl-3-methylimidazolium methanesulfonate were measured using inverse gas chromatography from (312 to 353) K. The retention data were also converted to gas-to-IL and water-to-IL partition coefficients using the corresponding gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the modified Abraham solvation parameter model. The derived equations correlated the experimental gas-to-IL and water-to-IL partition coefficient data to within average standard deviations of 0.113 and 0.143 log units, respectively.

Biomass, the fibrous material derived from plant cell walls, is a potentially clean and renewable nonfood feedstock for liquid fuel and chemical production in future biorefineries. The capability of ionic liquids to act as selective solvents and catalysts for biomass processing has already been proven. Thus, they are considered as an alternative to conventional solvents. Nevertheless, phase equilibria with biomass derived compounds is still lacking in the literature. To overcome the lack of experimental data on phase equilibria of biomass carbohydrates in ionic liquids, the solubility of d-glucose in four ionic liquids was measured within a temperature range from 283 to 373 K. Solubility data were successfully correlated with local composition thermodynamic models such as NRTL and UNIQUAC. In this work, the possibility of extracting glucose from these ionic liquids using the antisolvent method has been also evaluated. The parameters affecting the extraction process are the ionic liquid type, ethanol/ionic liquid ratio, temperature, water content, and time. Results indicate that ethanol can be successfully used as an antisolvent to separate glucose from ionic liquids.

The aim of this study is to investigate the possible use of 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][OTf]) as solvent for three separation tasks which appear in deep desulfurization of fuels: {aromatic sulfur compound + aliphatic hydrocarbon}, {nitrogen compound + aliphatic hydrocarbon}, or {sulfur compound + aliphatic hydrocarbon}. New three ternary systems are studied to investigate the capacity and selectivity of [BMIM][OTf] for extraction of sulfur and nitrogen containing aromatic organic compounds from aliphatic hydrocarbons. Aromatic hydrocarbon capture, which often appears causing unwanted reduction of fuel octane number, is also investigated. Therefore, LLE measurements of ternary mixtures for three systems are presented: {thiophene + n-heptane + [BMIM][OTf]}, {pyridine + n-heptane + [BMIM][OTf]}, {benzene + n-heptane + [BMIM][OTf]}, and {thiophene + n-heptane + [BMIM][OTf]} at 298.15 K and atmospheric pressure. The liquid−liquid equilibrium (LLE) data are correlated by the use of the NRTL model. Moreover, the extraction experiments of synthetic fuelsmodel gasoline and model diesel using [BMIM][OTf]have been performed. The influence of three stepped extraction procedure using each time a fresh portion of [BMIM][OTf] on the final gasoline and diesel compositions is presented.