UNIFAC (Universal Functional Activity Coefficient) is a group contribution method used to predict activity coefficients in non-ideal mixtures, particularly in liquid-liquid systems. It is particularly useful in the field of chemical engineering and thermodynamics for modeling phase behavior, such as vapor-liquid and liquid-liquid equilibria. The UNIFAC model is based on the idea that the behavior of a solution can be estimated by considering the contributions from different functional groups present in the molecules.
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