Excess Gibbs free energy local composition

For the industrially important class of mixed solvent, electrolyte systems, the Pitzer equation is not useful because its parameters are unknown functions of solvent composition. A local composition model is developed for these systems which assumes that the excess Gibbs free energy is the sum of two contributions, one resulting from long-range forces between ions and the other from short-range forces between all species. [Pg.86]

J. H. Vera, S. G. Sayegh, and G. A. Ratcliff. 1977. A quasi lattice-local composition model for the excess Gibbs free energy of liquid mixtures. Fluid Phase Equilib. 1 113. [Pg.734]

The concept of local compositions revolutionized the whole approach to developing expressions for the excess Gibbs free energy and, consequently, the activity coefficient. Wilson used it in developing the equa-... [Pg.469]

Abrams and Prausnitz (1975) combined Guggenheim s quasi-chemical tiieory with the concept of local compositions to develop the Universal Quasi-Chemical (UNIQUAC) expression for the excess Gibbs free energy. [The equation can be also developed from the two-fluid theory (Maurer and Prausnitz, 1978).]... [Pg.472]

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