Phase equilibria for reactive distillation of diethyl succinate: Part I. System diethyl succinate + ethanol + water

Liquid–liquid equilibrium data for the ternary system water–ethanol–diethyl succinate were measured at 303.15 K and 313.15 K and atmospheric pressure. The reliability of the LLE data was confirmed using the Othmer–Tobias correlation. P–x data for the vapor–liquid equilibrium for the binary system ethanol–diethyl succinate at 323.15 K and ethanol + water at 101.3 kPa were also measured. Data were fitted using the modified UNIQUAC and NRTL equations for the liquid phase and the Hayden–O’Connell (HOC) equation for the vapor phase. The models agree reasonably well with the experimental data and can predict reported azeotropic conditions. The NRTL-HOC is capable of fitting the LLE data better than the UNIQUAC-HOC.