Isobaric Vapor–Liquid Equilibrium for the Binary System of Dimethyl Adipate and 1,6-Hexanediol at 10, 20, and 99 kPa

Abstract

Saturated vapor pressures of pure dimethyl adipate and isobaric vapor–liquid equilibrium (VLE) data for the binary system of dimethyl adipate + 1,6-hexanediol at 10, 20, and 99 kPa were determined by a modified Othmer still. All of the VLE data passed the thermodynamic consistency test by Wisniak and Van Ness methods. The experimental data were correlated with the NRTL, Wilson, and UNIQUAC models. The results showed that the UNIQUAC model is slightly better among the three models.

Separation of Azeotropic Mixtures of Ethyl Acetate + Methylcyclohexane: Vapor–Liquid Equilibrium Measurements

“…The isobaric VLE data for the ethyl acetate + methylcyclohexane binary system were determined at 101.3 and 20.0 kPa in the present work, the vapor was therefore regarded as ideal gas and thus the activity coefficient is expressed as the modified Raoult’s law γ i = y i p x i p i s where γ i is the activity coefficient of component i in the liquid phase; x i and y i are the mole fractions of component i in vapor and liquid phases, respectively; p is the pressure of the system; p i s is the saturated vapor pressure of component i at temperature T , which is correlated using the following Antoine equation ln ( p i s / kPa ) = A i − B i T / normalK + C i where A i , B i , and C i are parameters of the Antoine equation for component i . , The parameters for ethyl acetate and methylcyclohexane are listed in Table .…”

“…where A i , B i , and C i are parameters of the Antoine equation for component i. 6,7 The parameters for ethyl acetate and methylcyclohexane are listed in Table 3.…”

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

“…NRTL, UNIQUAC, and Wilson activity coefficient models are widely used in the regression of the binary VLE. For the NRTL model, the nonrandom parameter is 0.3 . The structural volume (r) and area (q) parameters of the UNIQUAC activity coefficient model are predicted by the Bondi equation in the Aspen database, and these values are listed in Table .…”

Application of ionic liquid extractant in enhanced separation of 2-propanol-n-hexane azeotrope system

“…Based on the theoretical prediction results, the real effect of the screened ionic liquid on the vapor-liquid equilibrium behavior of 2-propanol-n-hexane azeotrope system was experimentally studied by using the improved Othmer vapor-liquid balance kettle [26]. Both of the samples from the vapor and liquid phases were analyzed with GC7900 (Techcomp) connected with a thermal conductivity detector (TCD) and packed column (GDX-403, 2 m × 0.53 mm × 1.0 µm).…”

“…The vapor-liquid phase equilibrium data of the 2-propanoln-hexane binary system was computed by the COSMO-RS model. The calculation results were compared with experimental data available in literature [26] to verify the accuracy of the azeotrope system phase equilibrium behavior obtained from COSMO-RS model. The results are shown in figure 3, where y exp 1 and y pre 1 indicate the experimental data and predicted data of hexane in vapor phase, respectively, and y pre−IL 1 and y exp−IL 1 denote the predicted data and experimental data of n-hexane in the vapor phase, respectively, with the molar fraction of C8A19 is 0.02.…”