A comparative study of thermodynamic properties of binary mixtures containing alkynes

Abstract

Literature data on molar excess enthalpies ( H E) and molar excess Gibbs energies ( G E) of linear alkynes+ n-alkanes, cycloalkanes, benzene or tetrachloromethane are treated in the framework of DISQUAC, an extended quasichemical group-contribution theory. The systems are characterized by three types of contact surfaces: acetylenic (CC group), aliphatic (CH 3 or CH 2 groups), cycloaliphatic (c-CH 2 group), aromatic (C 6H 6 group) and chlorine (CCl 4 group). Using a limited number of adjusted contact interchange energies parameters, the model provides a fairly consistent description of the thermodynamic properties as a function of concentration. The model may serve to predict missing data.