EXTENSION OF EOS NONITERATIVE METHODS TO DENSITY CALCULATIONS - CORRELATION OF SATURATED MOLAR VOLUMES AND HEATS OF VAPORIZATION

Soave's direct calculation procedures for the vapor pressure of pure c ompounds with cubic equations of state (EOSs), have been extended to t he calculation of phase densities at saturation for Peng-Robinson (PR) type EOSs. These universal relations have been used to propose EOS-ba sed correlation methods for the pure compound saturated liquid and vap or molar volumes, at temperatures higher than the normal boiling point . The methods yield satisfactory results independently of the molecula r nature of the chemical under consideration. The results for phase de nsities are used to correct the heats of vaporization predicted by the ZVPR-EOS. Complete relative error information is provided for calcula ted heats of vaporization and correlated vapor and liquid phase molar volumes for more than one hundred compounds of industrial interest.