Excess molar enthalpies of ternary mixtures of (methanol, ethanol + 2-propanol + 1,4-dioxane) at T=298.15 K

Abstract

Ternary excess molar enthalpies for the { x 1CH 3OH + x 2 i-C 3H 7OH + (1− x 1− x 2) c-C 4H 8O 2} and { x 1C 2H 5OH + x 2 i-C 3H 7OH + (1− x 1− x 2) c-C 4H 8O 2} mixtures have been measured by a flow microcalorimeter at T=298.15 K and ambient pressure. The experimental results are correlated with a polynomial equation and used to construct constant excess enthalpy contours. Furthermore, the results have been compared with those calculated from a UNIQUAC associated-solution model. This model considers the self-association of like alcohols, multicross-association of unlike alcohols, and solvation between alcohols and 1,4-dioxane. The model with the association constants, solvation constants, and binary information alone predict the ternary excess molar enthalpies satisfactorily.