Alkyl methanoates + benzene binary mixtures: New VLE measurements and DISQUAC analysis of thermodynamic properties

Abstract

Experimental vapor-liquid equilibrium (VLE) data are reported for the propyl methanoate (formate) + benzene mixture over the entire composition range at six constant temperatures, 293.15, 303.15, 313.15, 323.15, 333.15 and 343.15 K. The data were correlated with Redlich-Kister, Wilson and UNIQUAC equations for the liquid phase activity coefficients. The excess molar Gibbs energies, G E, were calculated for each temperature with vapor-phase nonidealities estimated from the virial equation of state. These experimental results along with literature data on VLE, G E and excess molar enthalpies H E of ethyl methanoates + benzene were examined on the basis of the DISQUAC group contribution model. The interaction parameters estimated by Delcros et al. [1] describe accurately the ethyl methanoate + benzene system. Revised parameters were proposed for propyl methanoate + benzene on the basis of the new VLE measurements.