Le potentiel chimique d'excès dans des systèmes binaires: acides dicarboxyliques –acides monocarboxyliques ou esters. L'énergie libre d'interéchange entre groupes aliphatiques et carboxyliques

We report experimental data concerning the solid–liquid and liquid–liquid equilibrium temperatures for some binary systems composed of ethyl hexadecanoate and some bicarboxylic aliphatic acids. The crystallization curves of these systems and of others, previously published only in a graphical form, are used in order to obtain the excess chemical potential of the bicarboxylic acid along its crystallization curve. This thermodynamic quantity is compared with that calculated from the theory of group interaction, by means of the areas of the contact surfaces and of three interchange energy parameters.