Abstract
The perturbation theory of Barker-Henderson was applied to the calculation of vapor-liquid equilibria of normal fluids. The previously determined Kihara potential parameters, used to evaluate the pair potential, were readjusted by the thermodynamic equilibrium condition in order to represent well the vapor-liquid coexisting regions. The potential parameters obtained were correlated by quadratic functions of acentric factor. By introducing the correction factor k12, the perturbation theory was found to be useful for correlating vapor-liquid equilibria of normal fluid mixtures except in the critical region of the mixture and near the critical temperature of the solvent.
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