Osmotic Coefficients and Refractive Indices of Aqueous Solutions of Ionic Liquids Containing 1-Butyl-3-methylimidazolium Halide at T = (298.15 to 328.15) K

Abstract

Experimental results of the osmotic coefficients and refractive indices of aqueous solutions of ionic liquids containing 1-butyl-3-methylimidazolium chloride, [BMIm]Cl, and 1-butyl-3-methylimidazolium iodide, [BMIm]I, have been measured over the composition range of 3 mol • kg -1 at T ) (298.15 to 328.15) K. The determination of experimental osmotic coefficients was performed by the vapor pressure osmometry method. The results show that osmotic coefficients increase when the concentration of ionic liquid and temperature increase. The osmotic coefficients were correlated to the Pitzer ion interaction and modified NRTL (MNRTL) models. From these data, mean activity coefficients and excess Gibbs free energies have been calculated. The results have been interpreted in terms of ion-solvent and ion-ion interactions and structural factors of the ionic liquid. Experimental results of refractive indices for the binary system are reported and have been fitted by a polynomial expansion.

Spectroscopic and viscometric studies on the interaction of ionic liquid, 1-butyl-3-methylimidazolium bromide with polyvinyl pyrrolidone

“…The ionic liquid used in this study, 1-butyl-3-methylimidazolium bromide, [BMIm]Br, was synthesized and purified according to the procedures described in the literature [26][27][28][29]. In this synthesis, Nmethylimidazole, 1-bromobutane and ethylacetate were used.…”

Vapour pressures, osmotic and activity coefficients for binary mixtures containing (1-ethylpyridinium ethylsulfate+several alcohols) at T=323.15K

“…There are several methods to obtain these thermodynamic data, such as the isopiestic method, headspace chromatography, direct vapour pressure measurement, and vapour pressure osmometry (VPO). In spite of the numerous advantages of this method, such as its high accuracy, being less time-consuming than other techniques used for VLE, and the fact that small amounts are enough for the experiments, the VPO is scarcely used in mixtures containing ionic liquids [1][2][3][4][5][6][7][8][9][10][11].…”

“…Shekaari and Mousavi have studied the osmotic properties of aqueous systems containing 1-propyl-3-methylimidazolium bromide, 1-pentyl-3-methylimidazolium bromide, and 1-hexyl-3-methylimidazolium bromide [6], 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium ethylsulfate, and 1-butyl-3-methylimidazolium methylsulfate [7], and 1-butyl-3-methylimidazolium chloride, and 1-butyl-3-methylimidazolium iodide [11]. Shekaari and Zafarani-Moattar have presented osmotic data for the binary mixtures 1-butyl-3-methylimidazolium bromide and 1-butyl-3-methylimidazolium tetrafluoroborate with water, and 1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium hexafluorophosphate with acetonitrile [2].…”

“…Both models are usually used in literature for electrolyte mixtures [2,7,9,11,[15][16][17][18][19][20] calculate the mean molal activity coefficients and the excess Gibbs free energy for the binary mixtures studied.…”

Measurement and modeling of osmotic coefficients of aqueous solution of ionic liquids using vapor pressure osmometry method

“…Some thermodynamic properties such as activity and osmotic coefficients have been measured for aqueous solutions of [C n MIm]Cl [30][31][32]. Recently, the osmotic coefficients of aqueous solutions of ionic liquids based on 1-alkyl-3-methylimidazolium halide have been reported in our previous papers at different temperatures [33,34].…”