Vapor–Liquid Equilibrium Experiment for Butanone and Ethyl Acetate at 101.3 kPa

Abstract

The formation of azeotrope brings severe challenges to the separation of butanone and ethyl acetate, two important chemical raw materials. In this article, two ionic liquids, 1-hexyl-3-methylimidazolium bis[(trifluoromethyland ethylene glycol (EG) were selected as entrainers to separate butanone and ethyl acetate. Vapor−liquid equilibrium data of butanone−ethyl acetate−[EMIM]-[NTf 2 ], butanone−ethyl acetate−[HMIM][NTf 2 ], and butanone−ethyl acetate−EG were measured at atmospheric pressure. The results show that the three extractants can effectively break the azeotrope of butanone−ethyl acetate, and the significant salt effect makes [EMIM][NTf 2 ] and [HMIM][NTf 2 ] show better separation ability than EG.Then, a non-random two liquid (NRTL) thermodynamic model was further used to fit the experimental data, and the average relative deviation was only 0.033, indicating that the NRTL model can well describe the influence of these three entrainers on the phase equilibrium behavior of butanone−ethyl acetate.

Isobaric Vapor–Liquid Equilibrium of Binary Mixtures of 2-Methylpentanedioic Acid Dimethyl Ester and Dimethyl Adipate at 101.3, 50.0, 30.0, and 10.0 kPa

“…In this work, the thermodynamic consistency of the experimental data was verified by the Fredenslund test and the Van Ness test. For the Fredenslund test, when Δ y ′ < 0.01, it is proved that the VLE data have passed the thermodynamic consistency test. , Its expression is as follows: At the same time, the deviation of vapor components ( y i ) and temperature ( T i ) should also be considered . The results are listed in Figures – . Additionally, the Van Ness test examined the vapor-phase composition and pressure, which is expressed as , where p i cal , T i cal , and y i cal are the calculated values from three models, respectively; p i exp , T i exp , and y i exp are the experimental values, separately.…”

“…For the Fredenslund test, when Δy′ < 0.01, it is proved that the VLE data have passed the thermodynamic consistency test. 20,21 Its expression is as follows:…”

Vapor-Liquid and Chemical Equilibrium for Esterification of Acetic Acid + Isopropanol with [HSO3 -bmim][HSO4 ] at 101.33 kPa

“…The results of NRTL parameters were listed in Table 5. Since the experimental pressure was about 101.33 kPa, the vapor gas was assumed to be the ideal gas [35][36][37]. The formula for γi is shown in Eq.…”

Isobaric Vapor–Liquid Equilibrium Experiment of N-Propanol and N-Propyl Acetate at 101.3 kPa

“…Although pressure swing distillation does not introduce external substances, it can only show a good separation effect for pressure-sensitive systems, so its application scope is relatively limited. Extractive distillation can not only avoid the above disadvantages but is also friendly to the environment. − Therefore, in our study, we decided to choose extractive distillation, and the selection of extractants is inevitable.…”