Vapor Pressure, Density, Viscosity and Refractive Index of Dimethyl Sulfoxide + 1, 4-Dimethylbenzene System

Abstract

This work reports the experimental results of the isothermal vapor-liquid equilibrium data between 303.15 K and 333.15 K, densities, viscosities and refractive indices from 298.15 to 323.15 K of the dimethyl sulfoxide + 1, 4-dimethylbenzene system over the entire range of mixture composition. The obtained PTX data were correlated and estimated by the Wilson, NRTL and UNIFAC models. The excess Gibbs energy and activity coefficients were calculated and compared with the others excess properties. Excess molar volumes, viscosity deviations and deviations in refractivity were calculated from experimental data; all the computed quantities were fitted to the Redlich-Kister equation. The resulting excess functions were interpreted in terms of the interactions between the molecules in the binary system.