Densities and vapor-liquid equilibrium values for binary mixtures composed of methanol + an ethyl ester at 141.3 kPa with application of an extended correlation equation for isobaric VLE data

Abstract

Vapor−liquid equilibrium data for binary systems containing methanol and ethyl esters, from methanoate to butanoate, are measured in a small recirculating still at 141.3 kPa and reported. Employing the same equilibrium still, the experimental vapor pressures are obtained for the ethyl esters considered here and correlated with a suitable equation. The densities and derived excess volumes for the same mixtures are also reported at 298.15 K. Azeotropes are found in the mixtures of methanol (1) + ethyl methanoate (2) and + ethyl ethanoate (2) at x1 = 0.337, T = 333.7 K and x1 = 0.742, T = 343.8 K, respectively. The data are correlated by using a new equation containing temperature-dependent coefficients. The estimates of various quantities including the excess enthalpies appear to be satisfactory. Activity coefficients calculated from experimental values are compared with those predicted by ASOG and UNIFAC group-contribution models.