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

Isoamyl butyrate is a common food additive. Water will be generated by esterification reaction in the process of its formation. Cyclohexane, n-hexane, and n-heptane are often selected as entrainers to remove water and promote the reaction. In this work, the vapor–liquid equilibrium data of the binary systems of isoamyl alcohol + isoamyl butyrate, cyclohexane + isoamyl butyrate, n-hexane + isoamyl butyrate, and n-heptane + isoamyl butyrate were determined by using a modified Rose vapor recirculating-type equilibrium still at 101.3 kPa. Fredenslund test and Van Ness point test methods are used to verify the thermodynamic consistency of the experimental vapor–liquid equilibrium data. In addition, three classical activity coefficient models, Wilson, NRTL, and UNIQUAC, were used to fit the isobaric vapor–liquid equilibrium data of four binary systems. The binary interaction parameters were obtained by regression of experimental data.