Mixing properties of tris(2-hydroxyethyl)methylamonium methylsulfate, water, and methanol at 298.15 K. Data treatment using several correlation equations

Abstract

Densities, viscosities, and refractive indices at 298.15 K and atmospheric pressure are reported for the binary and ternary mixtures formed by tris(2-hydroxyethyl) methylamonium methylsulfate, water, and methanol. Excess molar volumes and viscosity logarithm variations have been calculated from the physical properties of the pure compounds and their mixtures. The UNIQUAC volume and area parameters have been determined for the tris(2-hydroxyethyl) methylamonium methylsulfate ionic liquid. All properties changes of mixing have been fitted using two polynomial models and the UNIQUAC equation. An evaluation of the correlation capacity has been analyzed for the three models. (C) 2008 Elsevier Ltd. All rights reserved.