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A direct approach for specializing cubic equations of state to the prediction of the vapor–liquid equilibrium envelope of pure fluids is presented. The method is based on an asymptotic approximation of the equilibrium condition at low pressure, which forces a four-parameter van der Waals model to exactly reproduce the critical point and the saturation properties of a single reference state (usually,...
An approach for specializing cubic equations of state to the prediction of vapor pressures of pure fluids is presented. The method is based on a low-temperature asymptotic approximation of the vapor–liquid equilibrium problem which, applied to van der Waals-type models, allows obtaining analytical relationships for the geometry of the vapor pressure curve, for the enthalpy of vaporization and for...
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