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An alternative technology for anhydrous ethanol production is extractive distillation with salts such as potassium acetate and calcium chloride. Salting out effects in hydroalcoholic systems may be modeled using group contribution methods such as UNIFAC. This work presents a comparison between these models in the background of anhydrous ethanol production. The evaluated system is a ternary one (water, ethanol and salt – potassium acetate or calcium chloride) whose experimental data were taken from the literature. Although the results depend on reparametrizations carried out for each piece of work, it was observed that the best models (with lower deviations) were the simplest ones, without accounting for medium range interactions or solvation.

Comparative work about UNIFAC based models for hydroalcoholic systems with electrolytes