Thermodynamics of liquid-gas phase equilibria in the dipropylsulfoxide-water system in the range of 303.15 to 323.15 K

Abstract

The saturation vapor pressure of pure dipropylsulfoxide (DPSO) is measured in the temperature range of 303.15 to 323.15 K. The boiling point of DPSO under normal pressure (479.15 K) is determined and the molar heat of vaporization of DPSO is calculated (ΔvH○ = 61.4 ± 3.1 kJ/mol) on the basis of data obtained via graphical extrapolation. The total saturation vapor pressure of aqueous solutions of DPSO of various concentrations at 303.15 and 308.15 K is measured. Partial pressures, the activity coefficients of DPSO and H2O, and the excess Gibbs energy of mixing are calculated on the basis of the obtained results.