Improvement of the SRK equation of state for representing volumetric properties of petroleum fluids using Dortmund Data Bank

To improve the ability of SRK EOS for representing volumetric properties, t he Peneloux-Rauzy volume translation for the liquid density at reduced temp erature 0.7 has been combined with a temperature-dependent function. Based on an enormous number of data stored in the Dortmund Data Bank, the SRK par ameters of components in petroleum fluids have been fitted to a large numbe r of experimental data including 4170 saturated liquid density data and 809 7 PVT data at supercritical conditions. Using the new parameters, the predi ctive SRK model (group contribution mixing rule for the mixture parameters a and b of SRK EOS) is employed in this work to calculate the liquid densit y of binary mixtures. Satisfactory results have been obtained for both the vapor-liquid equilibrium and the densities of the coexisting phases. (C) 19 99 Elsevier Science Ltd. All rights reserved.