New Local Composition Model for Excess Gibbs Energy. I. Application for the Correlation of Isothermal VLE Data

A new local composition model for the excess Gibbs energy is derived from generalized lattice theory. The applicability of the model to the calculation of isothermal VLE data has been checked on a series of various binary systems. The results obtained show the superiority of the proposed model over previous proposals (the NRTL. Wilson, UNIQUAC) with the same number of adjustable parameters. Some recommendations about the use of the model have been made.