Orbey and Sandler (1995. Ind. Eng. Chem. Res. 34:4351.) have proposed a correction term to be added to the excess Gibbs energy of mixing given by UNIQUAC. To a reasonable degree of accuracy the new term can be written

Derive an expression for the correction to the activity coefficient.

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where GE GHIB RT = Σ – 21n(1 +aF)+144f-cpure - *;a; F= F-Σ1 1+aF