EXCESS-ENTHALPIES FOR VARIOUS BINARY-MIXTURES WITH N-METHYLACETAMIDE OR ACETIC-ANHYDRIDE

Excess enthalpy data provide information to allow a quantitative tempe rature extrapolation of the excess Gibbs energy model parameters or th e interaction parameters in group contribution methods. In the case of amide or anhydride systems however, insufficient excess enthalpy data are available in the literature. This paper presents excess enthalpie s for binary mixtures of N-methylacetamide with cyclohexanol, propanoi c acid, hexylamine, N,N-dimethylacetamide, benzene, toluene, propyl ac etate, and cyclohexanone at 90 degrees C and water at 50, 90, and 125 degrees C. Excess enthalpy data are also reported for binary mixtures of acetic anhydride with benzene, toluene, and cyclohexane at 90 degre es C. The results have been fitted to the Redlich-Kister expansion.