Phase equilibrium and excess Gibbs energy functions of acetophenone with 1,1,2-trichloroethene and cyclohexane binary mixtures by using NRTL, UNIQUAC, UNIFAC and VANLAAR models at a local atmospheric pressure of 95.3 kPa

Abstract

Boiling points of pure liquids and their binary mixtures are measured over the entire range of composition at a local atmospheric pressure of 95.3kPa. The experiments were carried by using a Swietoslawski-type ebulliometer. Vapor pressures of the pure components were computed using Antoine's equation. The activity coefficients and Gibbs energies were calculated for both the binary mixtures under investigation. Excess Gibbs energy values were found to be positive in both the binary systems. Both the binary systems were observed to be positive deviation from Raoult's law due to the dispersal forces acting between the component molecules in the liquid mixture. NRTL, UNIQUAC, UNIFAC and VAN LAAR models have also been applied successfully to both of the binary mixtures presented here. The results are discussed in terms of molecular interactions between the unlike molecules in the binary liquid mixtures.