Phase Equilibrium of Aqueous Systems Containing 3-Methyl-1-vinylimidazolium Methyl Sulfate

Abstract

This paper reports experimental data for the activity of water in aqueous solutions of 3-methyl-1-vinylimidazolium methyl sulfate (QVI) at (298 and 338) K and the solid−liquid equilibrium for the ternary system (QVI + sodium sulfate + water) at the same temperatures. QVI is an ionic monomer which is gaining importance as a monomer for water-soluble polymers. The experimental data presented here are to contribute to a database which is needed to develop and test thermodynamic models for the description/prediction of phase equilibrium in aqueous solutions of such polyelectrolytes. The new experimental results for the activity of water are described by the VERS model of Groβmann et al. for the excess Gibbs energy of aqueous solutions. Two interaction parameters were adjusted to correlate that data. The data set comprising the solid−liquid equilibrium was used for determining another set of interaction parameters (between that vinylimidazolium salt and sodium sulfate).

Influence of alkyl chain on the thermodynamic properties of aqueous solutions of ionic liquids 1-alkyl-3-methylimidazolium bromide at different temperatures

“…To date, only a few investigations on vapor pressure/activity coefficient data measurements of one or two solvents have been reported for the IL-containing systems. It can be cited here those reported by Heintz and co-workers [7][8][9][10][11][12], Gmehling and co-workers [13][14][15], Lee and co-workers [16,17], Zhao and co-workers by [18][19][20], Wang and co-workers [21][22][23][24][25], Li and co-workers [26], Zhang and co-workers [27,28], Artl and co-workers [29][30][31], Clavar et al [32,33], Martinez-Andreu and co-workers [34,35] Fedicheva et al [36] over the whole concentration range at different temperatures in water and organic solvents in terms of isobaric VLE data (T, x, y) and a few isothermic VLE data (P, x, y). In these studies, activity coefficients of molecular solvents in the studied ionic liquids have been determined and are described formally by using various excess Gibbs free energy models such as NRTL, UNIQUAC, and UNIFAC equations.…”