Determination of vapor-liquid equilibrium of the acetic acid + isopropanol esterification system and extractive distillation
Vapor-liquid equilibrium data plays an important role in azeotrope separation.To solve the problem of azeotrope separation in acetic acid + isopropanol esterification reaction system,the vapor-liquid equilibrium data of acetic acid + isopropanol +isopropyl acetate,acetic acid + isopropanol + water,acetic acid + isopropyl acetate + water,and isopropanol + isopropyl acetate + water were determined by Dvorak-Boublik equilibrium kettle.Thermodynamic consistency test and NRTL(nonrandom two-liquid)model correlation were performed on the experimental data.The feasibility of azeotrope separation was analyzed by residue curve.The extractive distillation process of isopropanol + isopropyl acetate + water was simulated and optimized by Aspen Plus.The results show that the mass fraction of isopropyl acetate and isopropanol are≥98%and≥99%,respectively.The results provide the data of ternary vapor-liquid equilibrium of acetic acid + isopropanol esterification reaction system,and show a theoretical basis for azeotrope separation of the system.
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