Extractive Distillation with Ionic Liquids: Pilot Plant Experiments and Conceptual Process Design

Meindersma, G.W.; Quijada‐Maldonado, E.; Jongmans, Mark; Hernández-Ortiz, Juan P.; Schuur, Boelo; Haan, A.B. de

doi:10.1007/978-3-662-48520-0_2

Cited by 6 publications

(7 citation statements)

References 34 publications

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“…14 Organic liquid solvents have been the primary choice for entrainers, but ILs have shown higher selectivity for many processes. 15,16 ILs are typically composed of a large organic cation and an inorganic anion with a melting point defined to be below 100 °C. 17 Room temperature ILs are liquids at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…There are five types of entrainers used in extractive distillation: liquid solvents, solid salts (or dissolved salts), a mixture of liquid solvents and solid salts, hyperbranched polymers, and ionic liquids (ILs) . Organic liquid solvents have been the primary choice for entrainers, but ILs have shown higher selectivity for many processes. , …”

Section: Introductionmentioning

confidence: 99%

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Process Designs for Separating R-410A, R-404A, and R-407C Using Extractive Distillation and Ionic Liquid Entrainers

Finberg

Shiflett

2021

Ind. Eng. Chem. Res.

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Hydrofluorocarbon refrigerants are being phased out over the next two decades due to their high global warming potential. To separate and recycle refrigerants that form azeotropic mixtures, current distillation methods are inadequate and a new technology is required. Extractive distillation using an ionic liquid as the entrainer offers a solution. Vapor liquid equilibria data for refrigerants difluoromethane (HFC-32), chlorodifluoromethane (HCFC-22), pentafluoroethane (HFC-125), 1,1,1-trifluoroethane (HFC-143a), and 1,1,1,2-tetrafluoroethane (HFC-134a) in ionic liquids 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2C1im][Tf2N]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([C4C1im][PF6]) were fit with the Peng–Robinson equation of state to simulate the separation of four azeotropic refrigerant mixtures (R-404A, R-407C, R-410A, and R-410A + HCFC-22) and to develop rate-based and equilibrium models in ASPEN Plus. Process flow diagrams were developed and optimized based on a set of physical and chemical constraints. The goal was to optimize the parameters to achieve refrigerant grade (>99.5 wt %) purity. The ionic liquids were found to be effective entrainers for separating refrigerant mixtures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Process Designs for Separating R-410A, R-404A, and R-407C Using Extractive Distillation and Ionic Liquid Entrainers

Finberg

Shiflett

2021

Ind. Eng. Chem. Res.

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“…21 Organic liquid solvents have been the primary choice for entrainers, but ILs have shown higher selectivity for some processes. 22,23 Ionic liquids are typically composed of a large organic cation and an inorganic anion, allowing these materials to exist in a liquid state at (or near) room temperature, unlike most salts. 24 The names and abbreviations of cations and anions represented in this work are shown in Table S2.…”

Section: Introductionmentioning

confidence: 99%

“…Five types of entrainers have been described for extractive distillation: liquid solvents, solid salts (or dissolved salts), a mixture of liquid solvents and solid salts, hyperbranched polymers, and ionic liquids (ILs) . Organic liquid solvents have been the primary choice for entrainers, but ILs have shown higher selectivity for some processes. , …”

Section: Introductionmentioning

confidence: 99%

Multicomponent Refrigerant Separation Using Extractive Distillation with Ionic Liquids

Finberg

May

Shiflett

2022

Ind. Eng. Chem. Res.

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Hydrofluorocarbon refrigerants are being phased out over the next two decades due to concerns about high global warming potential. In order to separate refrigerant mixtures that form azeotropes, new technologies will be required. Currently, fractional distillation is unable to efficiently separate azeotropic refrigerant mixtures. Extractive distillation using an ionic liquid as the entrainer offers a solution. Vapor–liquid equilibria data for refrigerants difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC-143a), chlorodifluoromethane (HCFC-22), propane (HC-290), and isobutane (HC-600a) and ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([C4C1im][PF6]) was regressed using the Peng–Robinson equation of state with the van der Waals 1-parameter mixing rule and Boston–Mathias nonideal correction. Process flow diagrams using ASPEN simulations were prepared for demonstrating how multicomponent mixtures of these refrigerants can be separated. Opportunities for measuring and modeling the solubility of new refrigerants in ionic liquids are discussed, and challenges remain for effectively separating some azeotropic refrigerant mixtures containing hydrofluorocarbons and hydrocarbons.

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“…Among the separation methods in the chemical industry, extractive distillation is more often applied for the separation of close-boiling mixtures . Extractive distillation has an inherent advantage in that it can reduce the energy requirement, and the suitable entrainer plays a key role in an effective and economical process. − Chlorobenzene is an excellent entrainer because of its favorable characteristics and molecular polarity.…”

Section: Introductionmentioning

confidence: 99%

Isobaric Vapor–Liquid Equilibrium for Binary and Ternary Systems of tert-Butanol + tert-Butyl Acetate + Chlorobenzene at 101.33 kPa

et al. 2018

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Isobaric vapor–liquid equilibria of tert-butanol + chlorobenzene and tert-butyl acetate + chlorobenzene binary systems and the tert-butanol + tert-butyl acetate + chlorobenzene ternary system at 101.33 kPa were measured using a circulation VLE still. The data of binary systems passed the thermodynamic consistency test of the Herington method and the Van Ness point test, and the experimental data of the ternary system also passed the Wisniak consistency test. These binary systems’ VLE data were fitted by the Wilson, nonrandom two-liquid (NRTL), and universal quasichemical (UNIQUAC) activity coefficient models with minor deviations. Furthermore, the obtained binary interaction parameters from the binary systems were used to predict the VLE behavior of the tert-butanol + tert-butyl acetate + chlorobenzene ternary system. The rmsd of vapor and the temperature between the experimental and predicted values for the ternary system were smaller than 0.0304 and 0.81K, respectively. The results indicated that the relative volatility between tert-butanol and tert-butyl acetate obviously increased when adding chlorobenzene as a solvent. Thus, chlorobenzene is a promising solvent for the separation of the tert-butanol and tert-butyl acetate mixture system by extractive distillation.

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Extractive Distillation with Ionic Liquids: Pilot Plant Experiments and Conceptual Process Design

Cited by 6 publications

References 34 publications

Process Designs for Separating R-410A, R-404A, and R-407C Using Extractive Distillation and Ionic Liquid Entrainers

Process Designs for Separating R-410A, R-404A, and R-407C Using Extractive Distillation and Ionic Liquid Entrainers

Multicomponent Refrigerant Separation Using Extractive Distillation with Ionic Liquids

Isobaric Vapor–Liquid Equilibrium for Binary and Ternary Systems of tert-Butanol + tert-Butyl Acetate + Chlorobenzene at 101.33 kPa

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