VAPOR-LIQUID-EQUILIBRIA OF SQUARE-WELL FLUIDS OF VARIABLE WIDTH BY BARKER-HENDERSON PERTURBATION THEORY-I

Vapour-liquid equilibria of square-well fluids of variable width (lamb da = 1.375, 1.5, 1.75 and 2.0) were studied based on the Barker-Hender son perturbation theory. Orthobaric densities, vapour pressures and he ats of vaporization were calculated with local and macroscopic compres sibility approximation. Comparison of the results with those of McLure and et al. [J. Chem. Phys. 96, 2296 (1992)] obtained with Monte Carlo simulation on Gibbs ensemble showed good agreement, except for result s obtained close to the critical temperatures.