Isobaric Vapor-Liquid Equilibria for Binary and Ternary Mixtures of Propanal, Propanol, and Propanoic Acid

Vapor−liquid equilibrium (VLE) data for the associating ternary system propanal + propanol + propanoic acid and three constituent binary systems were determined at different liquid phase compositions using a novel pump ebulliometer at 101.325 kPa. The vapor-phase compositions of these binary systems were calculated from Tpx according to the function of molar excess Gibbs energy by the Barker’s method. Moreover, the experimental T, x data are used to estimate Wilson, nonrandom two-liquid (NRTL), Margules, van Laar, and universal quasichemical activity coefficient (UNIQUAC) model parameters from regression, and these parameters in turn are used to calculate vapor-phase compositions. The activity coefficients of the solution were correlated with the Wilson, NRTL, Margules, van Laar, and UNIQUAC models through the fit of the least-squares method. The VLE data of the ternary system were well-predicted from these binary interaction parameters of Wilson, NRTL, Margules, van Laar, and UNIQUAC model parameters wit...