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- W2280147950 abstract "Environmental and safety concerns have prompted an active quest for ―green‖ alternatives to molecular solvents currently used in industrial chemical processes. In recent years, ionic liquids have been reported as potentially good replacements for conventional solvents. Activity coefficients at infinite dilution, ∞ i of various organic solutes have been measured in the temperature range from 313.15 to 373.15 K by gas-liquid chromatography and the inert gas stripping techniques in seven fluorinated ionic liquids (FILs). Partial molar excess enthalpies at infinite dilution of the solutes in the ionic liquids have been derived from the temperaturedependence of experimental ∞ i values. Selectivities and capacities have been calculated for various separation problems and compared to literature values for other ionic liquids, as well as conventional solvents. The effect of structure on the selectivity has been investigated. The present work, initiated in the context of South Africa‘s Fluorochemical Expansion Initiative is a contribution to the understanding of how structure influences FILs selectivity and capacity in different separation problems. FILs are interesting for South Africa as its geology contains large amounts of fluorine ores. For the n-hexane/benzene, and n-hexane/hex-1-ene systems which represent the aliphatics/aromatics and paraffins/olefins separation problems, higher selectivities at infinite dilution were obtained with FILs consisting of short-chained cations and small anions. The opposite trend was observed for the methanol/acetone and the ethanol/butan-2-one systems as representatives of the alcohols/ketones separation problem as well as the methanol/benzene system which refers to the alcohols/aliphatics mixtures. FILs with long cation alkyl chains and large anions tend to be the most selective for the benzene/ butan-2-one system, indicative of the aliphatics/ketones separation problem. The natural logarithm of ∞ i has been found to vary linearly with the carbon number of the alkyl chain attached to the methylpyrrolidinium or methylimidazolium group. On this ground, a simple equation correlating ∞ i as well as selectivity with the cation alkyl chain length has been proposed. It has been successfully tested using experimental data related to pyrrolidinium and imidazolium-based ionic liquids. Additionally, an inert gas stripping apparatus suitable for ∞ i measurements in ionic liquids has been constructed. Results obtained with the two different methods showed a good agreement. Abstract" @default.
- W2280147950 created "2016-06-24" @default.
- W2280147950 creator A5087337617 @default.
- W2280147950 date "2009-01-01" @default.
- W2280147950 modified "2023-09-27" @default.
- W2280147950 title "Infinite dilution activity coefficient measurements of organic solutes in fluorinated ionic liquids by gas-liquid chromatography and the inert gas stripping method" @default.
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