DENSITIES AND VAPOR-LIQUID-EQUILIBRIUM VALUES FOR BINARY-MIXTURES COMPOSED OF METHANOL PLUS AN ETHYL-ESTER AT 141.3KPA WITH APPLICATION OF AN EXTENDED CORRELATION EQUATION FOR ISOBARIC VLE DATA

Vapor-liquid equilibrium data for binary systems containing methanol a nd ethyl esters, from methanoate to butanoate, are measured in a small recirculating still at 141.3 kPa and reported. Employing the same equ ilibrium 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 als o reported at 298.15 K. Azeotropes are found in the mixtures of methan ol (1) + ethyl methanoate (2) and + ethyl ethanoate (2) at x(1) = 0.33 7, T = 933.7 K and x(1) = 0.742, T = 343.8 K, respectively. The data a re correlated by using a new equation containing temperature-dependent coefficients. The estimates of various quantities including the exces s enthalpies appear to be satisfactory. Activity coefficients calculat ed from experimental values are compared with those predicted by ASOG and UNIFAC group-contribution models.