Isobaric Vapor−Liquid Equilibria for Binary and Ternary Mixtures of Ethanol and 2-Propanol with 2-Butanone and Butyl Propionate at 101.3 kPa

Abstract

This paper presents vapor−liquid equilibrium (VLE) data at 101.3 kPa for the ternary systems ethanol + 2-butanone + butyl propionate and 2-propanol + 2-butanone + butyl propionate and some of their constituent binary systems: ethanol + butyl propionate and 2-butanone + butyl propionate. The ethanol + butyl propionate system exhibits positive deviation from Raoult’s law and 2-butanone + butyl propionate does not present appreciable deviation from ideal behavior. The activity coefficients of the solutions were correlated as a function of mole fraction by the Wilson, nonrandom two-liquid, and universal quasichemical models. The binary VLE data measured in the present study passed the thermodynamic consistency test of Fredeslund et al. The ternary systems were very well-predicted from binary interaction parameters and passed the McDermott−Ellis consistency test. Butyl propionate can be considered an effective agent for the separation of the azeotropic mixtures ethanol + 2-butanone and 2-propanol + 2-butanone by extractive distillation.