RECENT PROGRESS IN THE COMPUTATION OF EQUILIBRIUM RATIOS

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Abstract
The computation of equilibrium ratios plays an important role in any distillation design calculation. Three different types of models are used for generating equilibrium ratios in non-ideal mixtures:(1)Equations of state (2)Activity coefficient models (3)Group contribution methods Significant developments have taken place for all three types of models in recent years. New models have appeared, many model parameters have become available, and efficient and safe algorithms for implementing the models in distillation calculations have been proposed. The purpose of this contribution is to review these developments.