Aqueous solutions of ionic liquids. Description of osmotic coefficients within the Binding Mean Spherical Approximation. (December 2015)

• Record Type: Journal Article
• Authors: Papaiconomou, Nicolas; Simonin, Jean-Pierre; Bernard, Olivier
• Is Part Of: Journal of chemical thermodynamics. Volume 91(2015:Dec.)
• Page Start: 445
• Page End: 451
• Publication Date: 2015-12
• Subjects: Thermodynamics -- Osmotic coefficients -- Ionic liquids -- Mean Spherical Approximation; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2015.07.007
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: Modeling of osmotic coefficients of ionic liquids solutions using BiMSA. Thermodynamic description of aqueous solutions of ionic liquids. Effective diameters for ions of ionic liquids. Values for the association constants of ionic liquids in aqueous solutions. Abstract: The Binding Mean Spherical Approximation (BiMSA) is used to describe osmotic coefficients of aqueous solutions of salts containing imidazolium cations and bulky anions over the whole concentration range at temperature in the range (25 to 60) °C. A total of 13 salts have been considered altogether. The ion diameters, the permittivity of solution and the association constant were taken as adjustable parameters. Ionic liquids are described as being weakly associated in water, and association constants values obtained within the BiMSA model are in good agreement with those from the literature. Diameter values were assigned to 1-alkyl-3-methylimidazolium cations. The adjusted values obtained for the cation diameters increased with the number of carbons on the alkyl chain. For all systems studied, average relative deviations were found to be satisfactory.