Vaporization enthalpy of azeotropes by the solution calorimetry method

This work is devoted to the study of the thermochemistry of solvation of azeotropes. The enthalpies of dissolution of azeotropes (binary systems [organic nonelectrolyte - A], where A is acetonitrile, benzene, cyclohexane or n hexane) in the medium of cyclohexane or n-heptane have been determined. The impact of the structure of the components of the azeotropes on their properties in solution has been discussed. The approach based on the correlations between the enthalpies of solvation and molar refraction has been first used to determine the vaporization enthalpies of azeotropes. Values were found to be in a fairly good agreement with literature data obtained by direct and calculated methods. The findings of this study allow analyzing the structure-property relationships of the azeotropes obtained.

Automated summary

This work focuses on the thermochemistry of solvation of azeotropes. The enthalpies of dissolution of azeotropes in different mediums were determined, and the impact of the structure of the azeotropes on their properties in solution was discussed. A correlation between enthalpies of solvation and molar refraction was used to determine the vaporization enthalpies of azeotropes for the first time. The results were found to be consistent with literature data, obtained using direct and calculated methods. These findings contribute to the analysis of the structure-property relationships of azeotropes.