Experimental and Theoretical Study of Excess Molar Enthalpies of Ethyl Propionate + n-Hexane + 1-Butanol at 298.15 K

Excess molar enthalpies at the temperature 298.15 K and atmospheric pressure of the ternary mixture ethyl propionate + n-hexane + 1-butanol and the involved binary mixtures ethyl propionate + 1-butanol and n-hexane + 1-butanol were measured using a Calvet microcalorimeter. The results were fitted by means of different polynomial expressions. The group contribution models of Nitta-Chao and UNIFAC (in the versions of Tassios, Larsen, and Gmehling) were used to predict ternary excess enthalpy values, as well as several empirical expressions for estimating ternary properties from binary results.