Volumetric Behavior and Vapor-Liquid Equilibrium of Dimethyl Disulfide plus n-Alkanol Binary Mixtures

In this paper, we report densities at 303.15 and 323.15K and at atmospheric pressure (p=0.1MPa) of the binary mixtures containing dimethyl disulfide and a linear alkanol (methanol, ethanol, 1-propanol or 1-butanol). The isothermal vapor-liquid equilibrium for these systems was also determined at the same temperatures while the pressure range for vapor-liquid equilibrium measurement depends on both the mixture and temperature considered. The vapor-liquid equilibrium data were found to be thermodynamically consistent. From these data experimental excess volumes and excess Gibbs functions were obtained and correlated with composition using the Redlich-Kister polynomial expansion and the Wilson equation, respectively. The values of both excess properties were positive. The excess volumes, unlike the excess Gibbs functions, increase with the length of the n-alkanol chain.