Excess Enthalpies for Various Binary Mixtures with N-Methylacetamide or Acetic Anhydride

Abstract

Excess enthalpy data provide information to allow a quantitative temperature extrapolation of the excess Gibbs energy model parameters or the 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 enthalpies for binary mixtures of N-methylacetamide with cyclohexanol, propanoic acid, hexylamine, N,N-dimethylacetamide, benzene, toluene, propyl acetate, and cyclohexanone at 90 °C and water at 50, 90, and 125 °C. Excess enthalpy data are also reported for binary mixtures of acetic anhydride with benzene, toluene, and cyclohexane at 90 °C. The results have been fitted to the Redlich−Kister expansion.