Activity coefficients and excess Gibbs free energies for binary mixtures of N,N-dimethylformamide with substituted benzenes

Abstract

Vapour-liquid equilibrium (VLE) and boiling point data have been measured for binary mixtures of N, N-dimethylformamide with substituted benzenes, of different compositions, in a Swietoslawski-type ebulliometer. The mixtures include N, N-dimethylformamide with ethylbenzene; as well as chlorobenzene, and bromobenzene, with aniline. The measurements were made at 712 mm Hg. The experimental temperature-mole fraction data were used to estimate Wilson parameters, These, in turn, were used to calculate vapour compositions, boiling points and activity coefficients, from which the excess Gibbs free energies G E were calculated. The observed and calculated values are interpreted in terms of specific interaction.