The vapor−liquid equilibrium (VLE) data for the binary mixtures dimethyl disulfide + methanol, dimethyl disulfide + ethanol, dimethyl disulfide + 1-propanol, and dimethyl disulfide + 1-butanol have been measured over the complete composition range at p = 40 and 101.325 kPa using a Fischer Labodest ebulliometer. All of the considered binary systems exhibit azeotropic points. The study of the effect of pressure upon the azeotropic composition shows that an increase in the number of carbons in the n-alkanol induces the composition of the azeotropic point to move toward the dimethyl disulfide-rich region. Our experimental data were correlated by the Wilson equation and checked for thermodynamic consistency. The reduced excess Gibbs function was also calculated, and the values of this property are discussed in terms of molecular interactions. Moreover, our experimental VLE data were compared with those calculated with the modified UNIFAC model with unsatisfactory results.

This contribution reports densities together with the corresponding excess molar volumes, and excess molar enthalpies of the binary mixtures formed by ethyl isobutyrate and n-alkanols (from methanol to 1-butanol) at two temperatures (303.15 and 323.15) K and at atmospheric pressure (p = 0.1 MPa). These excess properties were correlated with composition using the Redlich-Kister equation. Excess molar volumes and enthalpies are positive, except the excess molar volumes for the mixture ethyl isobutyrate and methanol. Furthermore, the vapor-liquid equilibrium data for these mixtures at different experimental conditions have been also presented. Both the isothermal VLE at two temperatures (303.15 and 323.15) K and isobaric VLE at two pressures (40.000 and 101.325) kPa were measured. Some of the systems exhibit azeotropic points. The VLE data were found thermodynamically consistent. From experimental data the activity coefficients along with excess Gibbs function (isothermal) and reduced excess Gibbs functions (isobaric) were obtained and correlated with composition using the Wilson equation. These excess Gibbs function and reduced excess Gibbs functions were found positive. Finally, we have used our experimental VLE data to check the reliability of modified UNIFAC predictions.

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.