Isobaric Vapor–Liquid Equilibrium of Binary Mixtures of Ethylene Glycol Diacetate and 1,2-Butanediol Diacetate at 5.00, 10.00, and 15.00 kPa

The isobaric vapor–liquid equilibrium (VLE) data for the binary system of ethylene glycol diacetate (EGDA) and 1,2-butanediol diacetate (1,2-BDDA) were measured at 5.00, 10.00, and 15.00 kPa using a modified Rose–Williams equilibrium still. The thermodynamic consistency of the experimental data was confirmed by Fredenslund and Van Ness tests. The measured data were correlated with the nonrandom two-liquid (NRTL), universal quasi-chemical, and Wilson activity-coefficient models, and the corresponding binary interaction parameters were obtained through regression. The accuracy of each model was evaluated using the root-mean-square deviations (RMSDs) of the vapor-phase mole fraction (y1) and equilibrium temperature (T). All three models satisfactorily reproduced the experimental results, with the NRTL model showing the best agreement. The reliable VLE data and correlations reported in this work provide essential thermodynamic information for the modeling and design of separation processes involving EGDA and 1,2-BDDA.