CORRELATION OF PURE COMPONENT GIBBS ENERGY USING UNIFAC GROUP CONTRIBUTION

The UNIFAC group contribution method has already proved highly valuable for predicting excess Gibbs energies of liquid mixtures and hence vapor‐liquid equilibria. The solution of groups concept is extended to cover the total Gibbs energy of any system, pure or mixed, relative to a well‐defined standard state. The result is a correlation which is capable of predicting simultaneously pure component vapor pressures and standard Gibbs energies of formation and mixture vapor‐liquid equilibrium compositions. The results presented strongly support the approach and indicate that the method should be further developed. Copyright © 1979 American Institute of Chemical Engineers