Phase Diagrams and Thermodynamic Properties of Binary Organic Systems Based on 1,2-, 1,3-, 1,4-Diaminobenzene or Benzidine

Abstract

The phase diagram data of 47 binary organic systems were critically evaluated with the aid of a computer-coupled thermodynamic/phase diagram analysis. The systems are based upon the three isomeric diaminobenzenes or benzidine, and the second components are compounds such as phenol and substituted phenols, polyhydroxybenzenes, benzoic acid, etc. The results of such an analysis of phase diagram data include the excess Gibbs energies of the liquid phases as well as the Gibbs energies of fusion and formation of intermediate compounds. These quantities were used to calculate a 〈〈best〉〉 phase diagram for each system. Such phase diagrams conform to necessary thermodynamic constraints and follow from stated evaluative criteria of experimental data.