Weighted-Power-Mean mixture model for the Gibbs energy of fluid mixtures

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Authors

Focke, Walter Wilhelm

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Publisher

American Chemical Society

Abstract

A continuous family of excess Gibbs free energy expressions is derived based on the double-weighted power mean mixture model and concepts from cubic equations of state. This family has two types of parameters: The model form is determined by two power indices, whereas the matrix of binary coefficients characterizes pure component behavior and binary interactions. It is shown that the Porter, Margules, and Wassiljewa composition dependence are but special forms of this more general expression. In particular, the Wassiljewa Gibbs free energy form turns out to have the same composition dependence as the nonrandom two-liquid (NRTL) equation.

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Keywords

Gibbs free energy, Double -weighted power, Cubic equations, Pure component behavior, Binary interactions

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Citation

Focke, WW 2009, 'Weighted-Power-Mean mixture model for the Gibbs energy of fluid mixtures', Industrial and Engineering Chemistry Research, vol. 48, no. 11, pp. 5537-5541.