Solid-liquid equilibria and excess enthalpies in binary mixtures of propiophenone with some aliphatic amides

Abstract

The solid-liquid equilibria and excess enthalpies of the binary systems of propiophenone and {N-methylformamide, or N,N-dimethylformamide, or N,N-dimethylacetamide, or N-methyl-2-pyrrolidone} were measured. The SLE data were determined by the cloud-point method, partly supplemented by the DSC technique. The excess enthalpies were measured by the titration calorimetry at 298.15 K and 308.15 K for all the systems and additionally at 293.15 K and 318.15 K for the system with N-methylformamide, and at 293.15 K for the system with N,N-dimethylformamide. The activity coefficients of both components as a function of concentration and temperature were calculated by the correlation which included both types of data. The results of the prediction by the modified UNIFAC model were compared with the experimental data. The observed trends and differences between the systems were discussed.