Isobaric vapor–liquid–liquid equilibrium and vapor–liquid equilibrium for the system water–ethanol-1,4-dimethylbenzene at 101.3kPa

Gomis, Vicente; Pequenín, Ana; Asensi, Juan Carlos

doi:10.1016/j.fluid.2009.03.024

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…UNIFAC(VLE) predicts the phase envelope more accurately around the plait point area and the top of the heterogeneous region but fails to predict the organic liquid phase correctly. The overestimation of the heterogeneous region has previously been observed by Gomis and co-workers − , as well as Lladosa et al, among others, and appears to be a general shortcoming of these models. Far from the plait points, the models all predict the correct tie-line trends, yet in the region of the plait point only UNIFAC(VLE) delivers the correct trends.…”

Section: Resultssupporting

confidence: 52%

Vapor–Liquid–Liquid Equilibria Measurements for the Dehydration of Ethanol, Isopropanol, and n-Propanol via Azeotropic Distillation Using DIPE and Isooctane as Entrainers

et al. 2013

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Vapor–liquid equilibrium (VLE) and vapor–liquid–liquid equilibrium (VLLE) data were measured for the ethanol/diisopropyl ether (DIPE)/water, n-propanol/DIPE/water, and n-propanol/2,2,4-trimethylpentane (isooctane)/water systems at 101.3 kPa. The data were carefully measured in a Guillespie type still, equipped with an ultrasonic homogenizer. The VLE data were found to be thermodynamically consistent, and the LLE part of the VLLE data followed a regular profile according to the Othmer–Tobias correlation. VLLE were observed in the temperature ranges of (334.19 to 336.29) K, (335.31 to 345.76) K, and (347.74 to 352.31) K for the ethanol/DIPE/water, n-propanol/DIPE/water, and n-propanol/isooctane/water systems, respectively. These VLLE regions encompassed wide ranges for water and entrainer composition, with alcohol mole fractions of up to approximately 0.4. The ethanol/DIPE/water and n-propanol/isooctane/water systems displayed ternary heterogeneous azeotropes at (334.19 and 347.74) K, respectively. However, no ternary heterogeneous azeotrope was found for the n-propanol/DIPE/water system. The measured data were subsequently modeled in Aspen Plus with the nonrandom two-liquid (NRTL), universal functional UNIFAC(VLE), UNIFAC(LLE), and universal quasichemical UNIQUAC activity coefficient models, applying the default regression parameters built into Aspen Plus. UNIFAC(VLE) predicted the ethanol/DIPE/water system most accurately, while UNIQUAC performed the best for the n-propanol/DIPE/water. However, none of these models could predict the n-propanol/isooctane/water system with acceptable accuracy. The results of this study strongly support proposals that DIPE or di-n-propyl ether (DNPE) could be used as effective entrainers for alcohol dehydration, replacing the more traditional entrainers like benzene and cyclohexane.

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Section: Resultssupporting

confidence: 52%

Vapor–Liquid–Liquid Equilibria Measurements for the Dehydration of Ethanol, Isopropanol, and n-Propanol via Azeotropic Distillation Using DIPE and Isooctane as Entrainers

et al. 2013

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“…Gomis et al [29] 2009 Dynamic Guillespie 101. 3 11 Once full, the condensate in flask B returns to distilling flask A by means of conduit (2).…”

Section: Dynamic Methodsmentioning

confidence: 99%

A review of the isobaric (vapor+liquid+liquid) equilibria of multicomponent systems and the experimental methods used in their investigation

Gomis

Pequenín

Asensi

2010

The Journal of Chemical Thermodynamics

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“…In this sense, previous studies , have demonstrated that the estimation of VLLE carried out using parameters obtained from VLE or LLE data did not always agree with the experimental data. In a previous work, the 2-butanone + 2-butanol + water system has been focused on because of the extreme phase sensitivity of this system to temperature.…”

Section: Introductionmentioning

confidence: 67%

Liquid−Liquid and Vapor−Liquid−Liquid Equilibrium of the 4-Methyl-2-pentanone + 2-Butanol + Water System

Lladosa¹,

Cháfer²,

Montón³

et al. 2011

J. Chem. Eng. Data

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LiquidÀliquid equilibrium (LLE) data have been measured for the ternary system 4-methyl-2 pentanone þ 2-butanol þ water at (283.15 and 333.15) K. Experimental results show a low influence of temperature on immiscibility zone size and shape. The NRTL and UNIQUAC models were applied to correlate the ternary system at (283.15 and 333.15) K, and the interaction parameters obtained from both models successfully correlated the equilibrium compositions. Moreover, isobaric vaporÀliquidÀliquid equilibrium (VLLE) is measured for this ternary mixture at 101.3 kPa. The experimental data were compared with the estimation from LLE binary interaction parameters using NRTL and UNIQUAC models, as well as the correlation obtained with these models. The prediction of the UNIFAC LL model has been obtained and compared with the previous results, to confirm the necessity to obtain experimental data in this type of system.

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Isobaric vapor–liquid–liquid equilibrium and vapor–liquid equilibrium for the system water–ethanol-1,4-dimethylbenzene at 101.3kPa

Cited by 9 publications

References 13 publications

Vapor–Liquid–Liquid Equilibria Measurements for the Dehydration of Ethanol, Isopropanol, and n-Propanol via Azeotropic Distillation Using DIPE and Isooctane as Entrainers

Vapor–Liquid–Liquid Equilibria Measurements for the Dehydration of Ethanol, Isopropanol, and n-Propanol via Azeotropic Distillation Using DIPE and Isooctane as Entrainers

A review of the isobaric (vapor+liquid+liquid) equilibria of multicomponent systems and the experimental methods used in their investigation

Liquid−Liquid and Vapor−Liquid−Liquid Equilibrium of the 4-Methyl-2-pentanone + 2-Butanol + Water System

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