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Thermodynamic models present binary interaction parameters, based on theBoltzmann weight. Discrepancies from experimental data lead to empiricallyconsider temperature dependence of the parameters, but these modifications keepunchanged the exponential nature of the equations. We replace the Boltzmannweight by the nonextensive Tsallis weight, and generalize three models fornonelectrolyte solutions that use the local composition hypothesis, namelyWilson's, NRTL, and UNIQUAC models. The proposed generalizations present anonexponential dependence on the temperature, and relies on a theoretical basisof nonextensive statistical mechanics. The $q$-models present one extra binaryparameter $q_{ij}$, that recover the original cases in the limit $q_{ij} \to1$. Comparison with experimental data is illustrated with two examples of theactivity coefficient of ethanol, infinitely diluted in toluene, and in decane.

Nonextensive local composition models in theories of solutions