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Abstract
The experimental literature data on vapor-liquid equilibria (VLE), excess molar Gibbs energies (GE m ), excess molar enthalpies (GE m ) and activity coefficients of n-alkylamine + benzene mixtures are interpreted in terms of the DISQUAC group contribution model. The systems are characterized by three types of groups or contact surfaces: aliphatic (a), benzene (b) and amine (n). The interchange energies of the aliphatic/benzene and aliphatic/amine contacts were determined independently from the study of benzene + n-alkane and n-alkylamine + n-alkane systems, respectively. The interchange energies of the benzene/amine contact were calculated in this work from experimental GE m and GE m values. In view of the importance of the NH2-π interaction, we have kept constant a quasichemical coefficient for the benzene-amine contact and we have only varied the dispersive coefficients with the length of the n-alkylamine. The model reproduces quite well the experimental data.