Calculation of high-pressure vapour-liquid equilibria with a perturbed hard-sphere equation of state

Barker-Henderson perturbation theory is applied to calculation of vapour-liquid equilibria for binary mixtures of spherical-type molecules at pressures up to the critical. Upon fitting pure-fluid perturbation theory to experimental P, V, T data using the spherical-core Kihara potential, vapour-liquid equilibrium calculations are made for the argon + neopentane system at 50°C and the methane + neopentane system at 25°C. Excellent agreement with experimental results is obtained.