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

TL;DR

This study investigates the solid-liquid equilibria and excess enthalpies of binary mixtures of propiophenone with various aliphatic amides, providing experimental data and model predictions to understand their thermodynamic behavior.

Contribution

It provides new experimental measurements of SLE and excess enthalpies for these mixtures and compares them with modified UNIFAC model predictions.

Findings

SLE data obtained by cloud-point and DSC methods.

Excess enthalpies measured at multiple temperatures.

Modified UNIFAC model predictions compared with experimental data.

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 datawere determined by the cloud-point method, partly supplemented by the DSC technique. The excess enthalpieswere 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 comparedwith the experimental data. The observed trends and differences between the systems were discussed.