SIMULTANEOUS DESCRIPTION OF VAPOR-LIQUID-EQUILIBRIUM AND EXCESS-ENTHALPIES FOR METHANOL AND ETHANOL BINARY-MIXTURES WITH PROPANAL

Four different formulations of the thermodynamic properties of alcohol + unassociated active component mixtures have been used to describe s imultaneously the vapor-liquid equilibrium and excess enthalpies of th e methanol + propanal and ethanol + propanal mixtures. The equations u sed are based on a continuous linear association model proposed by Kre tschmer and Wiebe and extended by Nagata and coworkers to include alco hol + unassociated active component mixtures. The equations are severe ly tested in this attempt to describe the highly non-ideal mixtures fo rmed by an alcohol and propanal. Results obtained are more accurate th an those previously reported for the Lattice-Fluid and the Lattice-Flu id Associated Solution models.