ACTIVITY-COEFFICIENTS AND EXCESS GIBBS FREE-ENERGIES FOR BINARY-MIXTURES OF N,N-DIMETHYLFORMAMIDE WITH SUBSTITUTED BENZENES

Vapour-liquid equilibrium (VLE) and boiling point data have been measu red for binary mixtures of N,N-dimethylformamide with substituted benz enes, 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 we re 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 coefficient s, from which the excess Gibbs free energies G(E) were calculated. The observed and calculated values are interpreted in terms of specific i nteraction.