Ionic Liquids Can Enable the Recycling of Fluorinated Greenhouse Gases

Lepre, Luiz Fernando; Andre, Dune; Denis‐Quanquin, Sandrine; Gautier, Arnaud; Pádua, Agı́lio A. H.; Gomes, Margarida F. Costa

doi:10.1021/acssuschemeng.9b04214

Cited by 49 publications

(87 citation statements)

References 43 publications

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“…Ionic liquids (ILs) are a family of compounds that has attracted attention in several fields because of their interesting properties, namely, extremely low vapor pressure, chemical and thermal stability, wide liquid temperature range or non-flammability, among others. [8][9][10] The use of ILs as entrainers has been proposed to allow for the separation of azeotropic or close-boiling point blends of refrigerant gases, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and as working fluids in absorption refrigeration systems. [25][26][27][28][29][30][31][32][33][34] The efficient separation of refrigerant blends would promote a more circular economy in the RAC sector, whereby HFCs and HFOs recovered from end-of-life equipment are used to formulate novel low GWP blends.…”

Section: Introductionmentioning

confidence: 99%

Vapor–Liquid Equilibria and Diffusion Coefficients of Difluoromethane, 1,1,1,2-Tetrafluoroethane, and 2,3,3,3-Tetrafluoropropene in Low-Viscosity Ionic Liquids

et al. 2020

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The phase-down of hydrofluorocarbons (HFCs) established by the Kigali Amendment to the Montreal Protocol is leading to the formulation and commercialization of new refrigerant blends containing hydrofluoroolefins (HFOs), such as 2,3,3,3-tetrafluoropropene (R1234yf), and HFCs with moderate global warming potential, namely, difluoromethane (R32 ) and 1,1,1,2tetrafluoroethane (R134a). Moreover, the recycling of refrigerants is attracting attention as a means to reduce the amount of new HFCs produced and their release to the environment. To that end, the use of ionic liquids has been proposed as entrainers to separate refrigerants with close-boiling points or azeotropic blends. Thus, the vapor-liquid equilibria and diffusion coefficients of the refrigerant-ionic liquid pairs formed by R32 +studied using an isochoric saturation method at temperatures ranging from 283.15 to 323.15 K and pressures up to 0.9 MPa. In addition, the solubility behavior is successfully modeled using the non-random two-liquid activity coefficient method, and the Henry's law constants at infinite dilution, solvation energies and infinite dilution activity coefficients are calculated.

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Section: Introductionmentioning

confidence: 99%

Vapor–Liquid Equilibria and Diffusion Coefficients of Difluoromethane, 1,1,1,2-Tetrafluoroethane, and 2,3,3,3-Tetrafluoropropene in Low-Viscosity Ionic Liquids

et al. 2020

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“…A positive correlation is found between the degree of fluorination of the ILs and the solubilization of HFCs [87,88]. Additionally, the fluorination of the cation was shown to play a major role in the solubilization of PFCs [89] and HFCs [90] in 1-alkyl-3-methylimidazolium based ILs. The structures and the fluorination degree of the gases also strongly affect their solubilization into ILs.…”

Section: Separation Of Fluorinated Greenhouse Gases Using Filsmentioning

confidence: 81%

“…In contrast to the low solubility and toxicity intrinsic to many highly fluorinated compounds, some novel FILs have been designed with completely water miscibility [34,35] and negligible toxicity, [30,36,37] furthering its use in more green engineering processes and biomedical applications. In spite of these outstanding properties, scarce information is available in literature and research is mainly focused on their synthesis and characterization, [38] electrochemical properties, [39] gas solubilities [40] and application as reaction media [38,41].…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Ionic Liquids as Task-Specific Materials: An Overview of Current Research

Vieira¹,

Ferreira²,

Castro³

et al. 2021

Ionic Liquids - Thermophysical Properties and Applications

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This chapter is focused on the massive potential and increasing interest on Fluorinated Ionic Liquids (FILs) as task-specific materials. FILs are a specific family of ionic liquids, with fluorine tags equal or longer than four carbon atoms, that share and improve the properties of both traditional ionic liquids and perfluoro surfactants. These compounds have unique properties such as three nanosegregated domains, a great surfactant power, chemical/biological inertness, easy recovery and recyclability, low surface tension, extreme surface activity, high gas solubility, negligible vapour pressure, null flammability, and high thermal stability. These properties allied to the countless possible combinations between cations and anions allow the design and development of FILs with remarkable properties to be used in specific applications. In this review, we highlight not only the unique thermophysical, surfactant and toxicological properties of these fluorinated compounds, but also their application as task-specific materials in many fields of interest, including biomedical applications, as artificial gas carries and drug delivery systems, as well as solvents for separations in engineering processes.

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“…R134a ]. Points-experimental data [11,12,15,16,74,[78][79][80]. Solid linespredictions of CP-PC-SAFT, dashed lines-predictions of SAFT-VR-Mie.…”

Section: P(bar)mentioning

confidence: 99%

Comparison of CP-PC-SAFT and SAFT-VR-Mie in Predicting Phase Equilibria of Binary Systems Comprising Gases and 1-Alkyl-3-methylimidazolium Ionic Liquids

et al. 2021

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This study compares performances of the Critical Point-based revision of Perturbed-Chain SAFT (CP-PC-SAFT) and the SAFT of Variable Range and Mie Potential (SAFT-VR-Mie) in predicting the available data on VLE, LLVE, critical loci and saturated phase densities of systems comprising CO, O2, CH4, H2S, SO2, propane, the refrigerants R22, R23, R114, R124, R125, R125, R134a, and R1234ze(E) and ionic liquids (ILs) with 1-alkyl-3-methylimidazolium ([Cnmim]+) cations and bis(trifluoromethanesulfonyl)imide ([NTf2]−), tetrafluoroborate ([BF4]−) and hexafluorophosphate ([PF6]−) anions. Both models were implemented in the entirely predictive manner with k12 = 0. The fundamental Global Phase Diagram considerations of the IL systems are discussed. It is demonstrated that despite a number of quantitative inaccuracies, both models are capable of reproducing the regularities characteristic for the considered systems, which makes them suitable for preliminary estimation of selectivity of the ILs in separating various gases.

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Ionic Liquids Can Enable the Recycling of Fluorinated Greenhouse Gases

Cited by 49 publications

References 43 publications

Vapor–Liquid Equilibria and Diffusion Coefficients of Difluoromethane, 1,1,1,2-Tetrafluoroethane, and 2,3,3,3-Tetrafluoropropene in Low-Viscosity Ionic Liquids

Vapor–Liquid Equilibria and Diffusion Coefficients of Difluoromethane, 1,1,1,2-Tetrafluoroethane, and 2,3,3,3-Tetrafluoropropene in Low-Viscosity Ionic Liquids

Fluorinated Ionic Liquids as Task-Specific Materials: An Overview of Current Research

Comparison of CP-PC-SAFT and SAFT-VR-Mie in Predicting Phase Equilibria of Binary Systems Comprising Gases and 1-Alkyl-3-methylimidazolium Ionic Liquids

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