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

Abstract

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

Vapor-liquid equilibrium and excess properties of the binary mixtures formed by ethyl isobutyrate and n-alkanols

“…Calibration procedure can be found elsewhere [12]. The uncertainty of density measurements can be estimated in 2•10 -4 g•cm -3 .…”