Absorption separation of fluorinated refrigerant gases with ionic liquids: Equilibrium, mass transport, and process design

Asensio-Delgado, Salvador; Pardo, Fernando; Zarca, Gabriel; Urtiaga, Ane

doi:10.1016/j.seppur.2021.119363

Cited by 53 publications

(53 citation statements)

References 180 publications

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“…49 Recently, Asensio-Delgado et al published a summary of all references involving the solubility of fluorinated carbons in ILs, and provided process designs for separating refrigerants. 50 This study analyzes the separation of low boiling components in binary mixture R-410A and ternary mixtures: R-404A, R-407C, and R-410A mixed with 10 wt % chlorodifluoromethane (HCFC-22). R-410A was the replacement for HCFC-22 in residential air-conditioning systems, and recyclers find that these two refrigerants often get mixed together.…”

Section: Introductionmentioning

confidence: 99%

“…However, only three proposed designs have been published for the separation of low boiling components with an IL entrainer [e.g., carbon dioxide/ethane, tetrafluoroethylene/carbon dioxide, and difluoromethane (HFC-32)/pentafluoroethane (HFC-125)] . Recently, Asensio-Delgado et al published a summary of all references involving the solubility of fluorinated carbons in ILs, and provided process designs for separating refrigerants …”

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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“…They possess unique properties including low to negligible volatility and decreased vapor pollution relative to other volatile organic solvents. Various cationic and anionic combinations in ILs allow for tunable properties such as miscibility, hydrophobicity or hydrophilicity, solvation, polarity, and varying transport properties as well as reactive properties. , The selective tunability of ILs allows for their potential use in various fields including catalysis, − gas separations, − energy storage and fuel cells, − refrigeration systems and heat transformers, − etc.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of 1-Alkyl-3-methylimidazolium [Tf₂N] Ionic Liquids and Compressed 1,1,1,2-Tetrafluoroethane (R-134a)

Al‐Barghouti

Scurto

2022

J. Chem. Eng. Data

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The thermal conductivities of mixtures of ionic liquids (ILs) and fluorocarbon gases are necessary for the design of a variety of engineering and separation applications. Here, a transient hot-wire technique was used to measure the liquid thermal conductivities of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([EMIm][Tf2N]) and 1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([HMIm][Tf2N]) in vapor–liquid equilibrium with the hydrofluorocarbon gas, 1,1,1,2-tetrafluoroethane (R-134a), at (298.15, 323.15, 348.15) K for [HMIm][Tf2N] and (298.15, 348.15, 398.15) K for [EMIm][Tf2N] and pressures up to 28 bar. The thermal conductivity of the gas-saturated ionic liquid exhibits a very small and relatively linear decrease with increasing pressure (composition) of R-134a even to relatively high compositions (∼80% mol). Only at very high molar compositions of the gas (∼90+% mol) does the thermal conductivity significantly decrease toward that of the value of pure saturated liquid R-134a. However, no simple mixing rule of the pure component properties could correlate the trends in composition. As some potential applications require higher temperatures, the system of [EMIm][Tf2N]/R-134a was measured at 398.15 K. Generally, a longer alkyl-chain length on the cation, such as [HMIm][Tf2N], experiences a steeper decrease in thermal conductivity with increasing R-134a composition than with the [EMIm] cation.

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“…Hence, advanced separation processes including absorption in liquid absorbents, adsorption on particulate materials, and membrane separation are growing in importance as effective candidates. It is hitherto, however, absorption in ionic liquids (ILs) that receives the most research attention, with reference to the three elaborate reviews published by Asensio-Delgado et al, Hu et al, and Mellein et al 13,15,16 ILs are generally known as molten salts with melting points around room temperature. They have been featured as a neoteric solvent platform in the domain of chemical separation owing to their exceptional properties such as negligible vapor pressure, high thermal and chemical stability, and designable character.…”

Section: ■ Introductionmentioning

confidence: 99%

“…27−41 A more recent review elaborated by Asensio-Delgado et al has compiled equilibrium data and modeling efforts from near 200 published articles. 13 In this excellent work, more than 5000 data points are collected and comprehensively analyzed, which provides a useful source of data for theoretical predictions of refrigerant-in-IL solubility. As for the separation of refrigerant blends, Shiflett and Yokozeki initially performed the separation of the R410A mixture using [C 4 C1im][pf 6 ], 42 after which several works were reported that employed ILs to separate, purify, and recycle refrigerants and fluorinated monomers.…”

Section: ■ Introductionmentioning

confidence: 99%

Hierarchical Ionic Liquid Screening Integrating COSMO-RS and Aspen Plus for Selective Recovery of Hydrofluorocarbons and Hydrofluoroolefins from a Refrigerant Blend

Qin

Cheng

Hantao

et al. 2022

Ind. Eng. Chem. Res.

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The selective recovery of hydrofluorocarbons (HFCs) and hydrofluoroolefins (HFOs) from end-of-life equipment is regarded as an efficient and sustainable way for their reclamation, thereby reducing the production and emission of HFCs with high global warming potential. A R454C blend constituted of difluoromethane (R-32) and 2,3,3,3-tetrafluoropropene (R-1234yf) is a nontoxic and mildly flammable refrigerant ideally suitable for hermetically sealed refrigeration systems. This work presents a hierarchical screening of ionic liquids (ILs) for R-32 and R-1234yf recovery from R454C. First, 1093 HFC/HFO-in-IL solubility data (543 for R-32 and 550 for R-1234yf) are collected from the literature to evaluate the reliability of the COSMO-RS model for this system. Then, the solubility of R-32 and R-1234yf in 2224 ILs composed of 59 cations and 38 anions is predicted by COSMO-RS; following that, the IL structural effects on gas solubility are analyzed according to σ-profiles and excess energies. Subsequently, combining the thermodynamic performance and the melting point constraint, the top six ILs among the involved ILs are identified. Based on the retained ILs, a continuous absorption is simulated and evaluated in Aspen Plus, demonstrating that ILs n-(3sulfopropyl)pyridinium thiocyanate and n-(3-sulfopropyl)pyridinium hydrogensulfate are promising absorbents from the process point of view.

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Absorption separation of fluorinated refrigerant gases with ionic liquids: Equilibrium, mass transport, and process design

Cited by 53 publications

References 180 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

Thermal Conductivity of 1-Alkyl-3-methylimidazolium [Tf₂N] Ionic Liquids and Compressed 1,1,1,2-Tetrafluoroethane (R-134a)

Hierarchical Ionic Liquid Screening Integrating COSMO-RS and Aspen Plus for Selective Recovery of Hydrofluorocarbons and Hydrofluoroolefins from a Refrigerant Blend

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Absorption separation of fluorinated refrigerant gases with ionic liquids: Equilibrium, mass transport, and process design

Cited by 53 publications

References 180 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

Thermal Conductivity of 1-Alkyl-3-methylimidazolium [Tf2N] Ionic Liquids and Compressed 1,1,1,2-Tetrafluoroethane (R-134a)

Hierarchical Ionic Liquid Screening Integrating COSMO-RS and Aspen Plus for Selective Recovery of Hydrofluorocarbons and Hydrofluoroolefins from a Refrigerant Blend

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Product

Resources

About

Thermal Conductivity of 1-Alkyl-3-methylimidazolium [Tf₂N] Ionic Liquids and Compressed 1,1,1,2-Tetrafluoroethane (R-134a)