Total vapour pressure and excess Gibbs energy for binary mixtures of 1,1,2,2-tetrachlorethane or tetrachloroethene with cyclohexane at nine temperatures

Abstract

Vapour pressures of (cyclohexane + 1,1,2,2-tetrachloroethane (TCANE)) or (cyclohexane + tetrachloroethene (TCENE)) mixtures at nine temperatures between 283.15 and 323.15 K were measured by a static method. The reduction of the vapour pressures to obtain activity coefficients and excess molar Gibbs energies was carried out by fitting the vapour-pressure data to the Redlich–Kister polynomial according to Barker’s method. A comparative analysis about the thermodynamic behaviour of both systems is performed, taking into account the resonance effect in tetrachloroethene. For 1,1,2,2-tetrachloroethane + cyclohexane mixtures, we have tested the DISQUAC model observing that reproduces satisfactorily the G E experimental values at all temperatures.