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

Ternary excess molar enthalpies for the {x(1)CH(3)OH+x(2)i-C3H7OH +(1-x(1)-x(2))c-c(4)H(8)O(2)} and {x(1)C(2)H(5)OH+x(2)i-C3H7OH + (1-x(1)-x(2))C-C4H8O2} 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. (C) 2004 Elsevier Ltd. All rights reserved.