Vapour—liquid equilibrium at elevated pressures from the perturbation theory. II. Binary systems

Abstract

Vapour—liquid equilibria in binary systems of non-polar non-spherical molecule compounds were studied theoretically by combining the perturbation theory of convex molecule fluids with a new variant of the conformal solution theory. The recently proposed equation of state of hard convex body mixtures and the corresponding expressions for the contact values of distribution functions were employed to determine the reference thermodynamic functions and the perturbation terms. Ten binary systems, i.e. ArCH 4, N 2CH 4, N 2C 2H 4, N 2C 2H 6, CH 4C 2H 4, CH 4C 2H 6, C 2H 4C 2H 6, CO 2C 2H 4, CO 2C 2H 6, and ArCO 2 were studied at constant temperatures. Comparison of theoretical predictions with experimental data is given.