Thermodynamics of liquid-vapor phase equilibrium in dimethyl sulfoxide-alkanol systems in the range of 293.15-323.15 K

摘要

Liquid-vapor phase equilibria in dimethyl sulfoxide-alkanol (1-propanol, 1-butanol, and tert-butanol) binary systems are studied using a static method. The total saturated vapor pressure in the temperature range of 293.15-323.15 K is measured. The partial pressures of dimethyl sulfoxide and alkanes have been calculated via integrating the Gibbs-Duhem equation. Excess molar Gibbs energies are described by the Redlich-Kister equation, and the correlation parameters are calculated. The nature of the deviation from the ideal behavior of these solutions is explained by allowing for the presence of competing homo- and heteromolecular interactions and the considerable effect of the length of the alkanols' hydrocarbon chains has on the values of the thermodynamic parameters.