Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Molar excess enthalpies, HEm, measured by means of a Tian-Calvet microcalorimeter, for the ternary system {1-propanol + N,N,N-triethylamine (TEA) + 2-butanone} at T = 298.15 K are reported. Values of HEm for the constituent binaries are available in the literature. The data are interpreted in terms of different interactional contributions to HEm. The coefficients of the corresponding fittings of binary and ternary HEm values have been used to determine the partial molar excess enthalpies of each component. It is concluded that 1-propanol and TEA molecules can participate in interactions between unlike molecules, and that 2-butanone is mainly a breaker of interactions between like molecules. The DISQUAC model is applied, using binary parameters only, for the HEm prediction of the ternary mixture investigated. Large differences between experimental values and theoretical results show the existence of ternary interactions.