APPLICATION OF DIFFERENT GROUP-CONTRIBUTION MODELS AND EMPIRICAL-METHODS TO EXCESS-ENTHALPIES OF TERNARY MIXTURES

Studies were previously made of the excess molar enthalpies, H-m(E), a t 298.15 K and normal atmospheric pressure of the ternary mixtures (et hyl propanoate or 3-pentanone) + (n-hexane) + (n-decane, n-dodecane or n-tetradecane) and (1-propanol) + (3-pentanone) + (n-hexane, n-heptan e, n-octane, 1-hexanol or 1-heptanol). In the present work, experiment al values of H-m(E) were correlated through use of the Cibulka and Nag ata equations, and a new correlation equation is proposed. Experimenta l data were compared with the predictions of the UNIFAC I (version of Tassios), UNIFAC II (version of Larsen) and Nitta-Chao group contribut ion models. H-m(E) values were used to test several empirical predicti ve methods, both symmetric (Kohler, Jacob-Fitzner, Colinet and Knobelo ch-Schwartz), and asymmetric (Tsao-Smith, Toop, Scatchard, Hillert and Mathieson-Tynne).