Binary Isobaric Vapor–Liquid Equilibrium for Methyl Benzoate with Benzyl Alcohol and Benzaldehyde

The binary vapor–liquid equilibria (VLE) of (methyl benzoate + benzyl alcohol) and (methyl benzoate + benzaldehyde) were measured and correlated using activity coefficient models. The measurements were performed using a modified Othmer still at constant pressures of 101.3, 51.3, and 21.3 kPa. The measured data were tested for consistency and correlated using the non-random two-liquid (NRTL), Wilson, and universal quasi-chemical (UNIQUAC) models. The data were also compared with predictive models, such as UNIFAC and the machine learning version of COSMO-SAC. Temperature dependence of the interaction parameters was required to accurately represent the data, covering the pressure range of the experiments. These results can be used to design a purification process for methyl benzoate production.