Separation of ethyl acetate and 2-propanol azeotropic mixture using ionic liquids as entrainers

Zhang, Zhigang; Zhang, Aidi; Wu, Kaifang; Zhang, Qinqin; Hu, Angran; Li, Wenxiu

doi:10.1016/j.fluid.2016.08.011

Cited by 26 publications

(8 citation statements)

References 34 publications

(31 reference statements)

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“…Methylimidazolium-based ILs are the most widely studied IL entrainers in extractive distillation, and their good selectivity has been verified by a large number of experiments. − Methylimidazolium-based ILs showed excellent separation effect on ester–alcohol azeotropic systems, such as the methyl acetate–methanol system, , ethyl acetate–ethanol system, and ethyl acetate–2-propanol system . The shorter the alkyl substituent chain of methylimidazole ring, the stronger the separation effect of IL on the ester–alcohol azeotropic mixture.…”

Section: Introductionmentioning

confidence: 97%

“…20−26 Methylimidazolium-based ILs showed excellent separation effect on ester−alcohol azeotropic systems, such as the methyl acetate−methanol system, 27,28 ethyl acetate−ethanol system, 29 and ethyl acetate−2-propanol system. 30 The shorter the alkyl substituent chain of methylimidazole ring, the stronger the separation effect of IL on the ester−alcohol azeotropic mixture.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ionic Liquids on the Binary Vapor–Liquid Equilibrium of Ethyl Acetate + Methanol System at 101.3 kPa

Zhang

Guo

et al. 2018

J. Chem. Eng. Data

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Three ionic liquids (ILs) (1-ethyl-3-methylimidazolium bromide, [EMIM]Br; 1-ethyl-3-methylimidazolium chloride, [EMIM]Cl; and 1ethyl-3-methylimidazolium acetate, [EMIM][Ac]) were used for the separation of the ethyl acetate + methanol azeotropic mixture. The vapor− liquid equilibrium (VLE) data of ethyl acetate + methanol azeotropic mixtures containing ILs were measured at 101.3 kPa. The three ILs show significant salting-out effects on ethyl acetate. The azeotropic point of the ethyl acetate + methanol azeotropic system is eliminated when the mole content of IL reaches a special value. The separation abilities of the three ILs follow the order [EMIM][Ac] > [EMIM]Cl > [EMIM]Br. The experimental data are correlated well by the nonrandom two-liquid model.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of Ionic Liquids on the Binary Vapor–Liquid Equilibrium of Ethyl Acetate + Methanol System at 101.3 kPa

Zhang

Guo

et al. 2018

J. Chem. Eng. Data

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“…The key to extractive distillation is choosing a suitable entrainer. Conventional entrainers, − such as organic solvents and inorganic salts, have the disadvantages of excessive solvent consumption, toxicity, and corrosion to pipelines.…”

Section: Introductionmentioning

confidence: 99%

Separation of the Dimethyl Carbonate + Ethanol Mixture Using Imidazolium-Based Ionic Liquids as Entrainers

Zhang

Wang

et al. 2020

J. Chem. Eng. Data

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The mixture of dimethyl carbonate (DMC) and ethanol is a common binary azeotrope system in industry that cannot be effectively separated by conventional separation methods. Two ionic liquids (ILs), namely, 1-butyl-3methylimidazolium dibutylphosphate ([BMIM][DBP]) and 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), were tried as novel entrainers for the separation of the DMC−ethanol azeotrope. The vapor−liquid equilibrium (VLE) data of the DMC−ethanol binary system and the DMC−ethanol−ILs ternary system at atmospheric pressure were determined. The results showed that both ILs could increase the relative volatility of DMC to ethanol, thus completely breaking the azeotrope at a certain concentration, and [BMIM][Ac] had more excellent separation capacity than [BMIM][DBP]. The NRTL model and the UNIFAC-Lei model were used to correlate the experimental VLE data, and the fitting results indicated that the NRTL model was in good agreement with the experimental data.

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“…The liquid phases of the mixtures of ILs and n -alkyl alcohols were studied systematically. ,− The vapor–liquid equilibria (VLE) of ILs with n -alkyl alcohols − as well as with branched alkyl alcohols were reported and different models for a theoretical/computational description − were applied. Moreover, there were also many studies that were concerned with ternary mixtures focusing on the use of ILs for breaking the azeotropes of alcohol and water, ,− or other molecular liquids such as acetone, − methyl acetate, − ethyl acetate, − benzene, , or acetonitrile.<...…”

Section: Introductionmentioning

confidence: 99%

Vapor–Liquid Equilibria of the Ionic Liquid 1-Hexyl-3-methylimidazolium Triflate (C₆mimTfO) withn-Alkyl Alcohols

Stuckenholz

Stodt

Schröer

et al. 2020

Ind. Eng. Chem. Res.

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Isobaric vapor–liquid equilibria (VLE) of binary mixtures of the ionic liquid (IL) 1-hexyl-3-methylimidazolium trifluoromethanesulfonate (C6mimTfO) and the n-alkyl alcohols methanol, ethanol, propan-1-ol, and butan-1-ol at three pressures are reported. Measurements were carried out at pressures of p = 1000, 700, and 500 mbar, which allowed to cover compositions in the range of 0.24–0.35 ≤ x (n-alkyl alcohol) ≤ 1.0 and temperatures in the range of 321.8 K ≤ T ≤ 423.6 K. The experimental data are described applying two theoretical models: (1) the nonrandom two-liquid (NRTL) model as an example of a descriptive model for calculating the excess free Gibbs energy G E and (2) the perturbed-chain statistical associating fluid theory (PC-SAFT) equation of state (EoS) as an example of a model based on statistical thermodynamics. Both approaches allow a description of the phase equilibria with good accuracy (AARDVLE,NRTL ≤ 0.3% and AARDVLE,PC‑SAFT ≤ 1.1%) and redraw its details, partially quantitative, when applied as a fitting algorithm (NRTL) or when applying the PC-SAFT theory. The present work is a continuation of an ongoing study, which aims at developing the structure–property relationships of ILs. With the present results, a first systematic view on the impact of the alkyl side chain length of the C x mim+ (x = 2, 4, 6) cation on the boiling behavior of binary IL (C x mimTfO)/n-alkyl alcohol mixtures is provided by scaling the boiling temperatures of the mixtures with that of the pure alcohol master plot results. Our data reveal that increasing the alkyl chain length of the C x mim+ cation causes an enhancement of the attractive forces between the IL and the n-alkyl alcohol moieties, resulting in an increase in the relative boiling temperature of the binary mixture.

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Separation of ethyl acetate and 2-propanol azeotropic mixture using ionic liquids as entrainers

Cited by 26 publications

References 34 publications

Effect of Ionic Liquids on the Binary Vapor–Liquid Equilibrium of Ethyl Acetate + Methanol System at 101.3 kPa

Effect of Ionic Liquids on the Binary Vapor–Liquid Equilibrium of Ethyl Acetate + Methanol System at 101.3 kPa

Separation of the Dimethyl Carbonate + Ethanol Mixture Using Imidazolium-Based Ionic Liquids as Entrainers

Vapor–Liquid Equilibria of the Ionic Liquid 1-Hexyl-3-methylimidazolium Triflate (C₆mimTfO) withn-Alkyl Alcohols

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Separation of ethyl acetate and 2-propanol azeotropic mixture using ionic liquids as entrainers

Cited by 26 publications

References 34 publications

Effect of Ionic Liquids on the Binary Vapor–Liquid Equilibrium of Ethyl Acetate + Methanol System at 101.3 kPa

Effect of Ionic Liquids on the Binary Vapor–Liquid Equilibrium of Ethyl Acetate + Methanol System at 101.3 kPa

Separation of the Dimethyl Carbonate + Ethanol Mixture Using Imidazolium-Based Ionic Liquids as Entrainers

Vapor–Liquid Equilibria of the Ionic Liquid 1-Hexyl-3-methylimidazolium Triflate (C6mimTfO) withn-Alkyl Alcohols

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Vapor–Liquid Equilibria of the Ionic Liquid 1-Hexyl-3-methylimidazolium Triflate (C₆mimTfO) withn-Alkyl Alcohols