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).