Development of an universal group contribution equation of state

Abstract With a view to the development of an universal group contribution equation of state, the Peng–Robinson (PR) equation of state (EOS) has been modified to obtain a better description of saturated liquid densities for the pure compounds. A simple improved volume translation together with a temperature dependent volume correction deliver an accurate representation of this property near and far from the critical point for polar and non-polar substances. The fitted parameters have been generalized as a function of the critical compressibility factor. The results are compared with the results of the original PR and the Soave–Redlich–Kwong (SRK) EOS.

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