Thermodynamics of (ketone + amine) mixtures. Part XI. Excess molar enthalpies at T = 298.15 K for the (1-propanol + N,N,N-triethylamine + 2-butanone) system

• HmE values at 298.15 for the 1-propanol + TEA + 2-butanone system are reported.
• H¯m,iE values are determined for each component.
• 1-Propanol and TEA can participate in interactions between unlike molecules.
• 2-Butanone is mainly a breaker of interactions between like molecules.
• Ternary interactions contribute to HmE. DISQUAC fails when representing these data using only binary interaction parameters.

Molar excess enthalpies, HmE, 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 HmE for the constituent binaries are available in the literature. The data are interpreted in terms of different interactional contributions to HmE. The coefficients of the corresponding fittings of binary and ternary HmE 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 HmE prediction of the ternary mixture investigated. Large differences between experimental values and theoretical results show the existence of ternary interactions.

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