Isobaric Vapor–Liquid Phase Equilibrium Measurements, Correlation, and Prediction for Separation of the Mixtures of Cyclohexanone and Alcohols

Abstract

For separation of the mixtures cyclohexanone with alcohols by distillation, the isobaric vapor−liquid equilibrium data for cyclohexanone + (ethanol/n-propanol/ isopropanol) were measured at 101.3 kPa. The van Ness, pure component consistency, and Herington test were used to validate the measured data consistency. The measured data were fitted by the Wilson, NRTL, and UNIQUAC models with the optimized binary parameters. For comparison, the phase equilibrium values for the investigated mixtures were predicted by the COSMO-SAC and UNIFAC models, and the standard deviations of vapor phase composition by the two models are less than 0.0043 and 0.0055.

Isobaric Vapor–Liquid Equilibrium Measurements for 1-Methoxy-2-propanol + 1,4-Butanediol, N,N-Dimethylformamide, and N-Methyl-2-pyrrolidone at 101.3 kPa

“…In addition, the pure component consistency test , can be used to check the consistency of pure components approaching bubbles or dew. For the isobaric systems, the relative average deviations of pressures (Δ p 1 0 , Δ p 2 0 ) between the experimental results and the values calculated using the NRTL model at dew and bubbles can be used to evaluate the consistency.…”

Isobaric Vapor–Liquid Equilibrium of Isoamyl Alcohol, Cyclohexane, n-Hexane, and the n-Heptane + Isoamyl Butyrate Binary System at 101.3 kPa

“…In this work, three common entrainers of isoamyl butyrate and its reactant (isoamyl alcohol) were studied. The isobaric VLE data of four binary systems, isoamyl alcohol + isoamyl butyrate, cyclohexane + isoamyl butyrate, n -hexane + isoamyl butyrate, and n -heptane + isoamyl butyrate, are determined using a modified Rose vapor recirculating-type equilibrium still. − The Fredenslund test method and Van Ness point test method were used to test the thermodynamic consistency of the experimental VLE data. − Finally, Aspen Plus was used to regress the binary interaction parameters (BIPs) of the three activity coefficient models of NRTL, UNIQUAC, and Wilson. − The relative volatility of the binary system was accurately calculated, which provided data support for process simulation for selecting the best entrainer in the synthesis of isoamyl butyrate.…”