Solubility of hydrofluorocarbons in phosphonium-based ionic liquids: Experimental and modelling study

Sousa, José M.M.V.; Granjo, José F.O.; Queimada, António J.; Ferreira, A.G.M.; Oliveira, Nuno M.C.; Fonseca, I.M.A.

doi:10.1016/j.jct.2014.08.001

Cited by 27 publications

(16 citation statements)

References 30 publications

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“…Solubilities of gases including HFCs in ILs have been accurately modeled using cubic EoS models as well as activity coefficient models, including NRTL, Wilson, and Margules. ,,− To utilize experimental or computed solubility data in a process optimization framework, it is necessary to have analytic equations to represent the data. A particularly effective way of representing HFC/IL solubility data is with a cubic EoS.…”

Section: Methodsmentioning

confidence: 99%

Phase Equilibria, Diffusivities, and Equation of State Modeling of HFC-32 and HFC-125 in Imidazolium-Based Ionic Liquids for the Separation of R-410A

Morais

Harders

Baca

et al. 2020

Ind. Eng. Chem. Res.

134

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Growing concerns about the global warming potential of hydrofluorocarbons (HFCs) has led to increasing interest in developing technologies to effectively recover and recycle these refrigerants. Ionic liquids (ILs) have shown great potential to selectively separate azeotropic HFC gas mixtures, such as R-410A composed of HFC-32 (CH2F2) and HFC-125 (CHF2CF3), based on solubility differences between the refrigerant gases in the respective IL. Isothermal vapor–liquid equilibrium (VLE) data for HFC-32 and HFC-125 were measured in ILs containing fluorinated and nonfluorinated anions using a gravimetric microbalance at pressures ranging from 0.05 to 1.0 MPa and a temperature of 298.15 K. The van der Waals equation of state (EoS) model was applied to correlate the experimental solubility data of each HFC refrigerant/IL mixture. The solubility differences between HFC-32 and HFC-125 vary significantly depending on the choice of IL. The diffusion coefficients for both HFC refrigerants in each IL were calculated by fitting Fick’s law to time-dependent absorption data. HFC-32 has a higher diffusivity in most ILs tested because of its smaller molecular radius relative to HFC-125. Based on the calculated Henry’s law constants and the mass uptake for each system, [C6C1im][Cl] was found to have the highest selectivity difference for separating R-410A at 298.15 K.

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Section: Methodsmentioning

confidence: 99%

Phase Equilibria, Diffusivities, and Equation of State Modeling of HFC-32 and HFC-125 in Imidazolium-Based Ionic Liquids for the Separation of R-410A

Morais

Harders

Baca

et al. 2020

Ind. Eng. Chem. Res.

134

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“…Hydrofluorocarbon (HFC) refrigerants with ILs as working pairs for the absorption cycle have been investigated extensively in the past few years. − Recently, R1234ze(E) was proposed as a potential substitution for HFCs, especially for R134a . Hence, the possibility of R1234ze(E) + ILs pairs used in the absorption refrigeration systems deserves investigation.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria of trans-1,3,3,3-Tetrafluoropropene with Three Imidazolium Ionic Liquids

et al. 2017

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In recent years, trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) was proposed as a possible replacement for hydrofluorocarbons. In this work, the vapor−liquid phase equilibrium of R1234ze(E) with three imidazolium ionic liquids (ILs) were measured from (283.15 to 343.15) K based on the isochoric method. The ILs include 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]), 1-hexyl-3-methylimidazolium tetrafluoroborate ([Hmim][BF 4 ]), and 1-octyl-3-methylimidazolium tetrafluoroborate ([Omim][BF 4 ]). The experimental results were correlated using the nonrandom two-liquid activity coefficients model. The deviations between experimental data and calculated values for pressure were 1.77%, 2.07%, and 2.32% for R1234ze(E) + [Emim][BF 4 ], + [Hmim][BF 4 ], and + [Omim]-[BF 4 ] systems, respectively.

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“…The partial molar enthalpies and the partial molar entropies of solution at infinite dilution limit can be calculated from the following thermodynamic relations [24]:…”

Section: Resultsmentioning

confidence: 99%

“…Shiflett et al [9] reported the solubilities of R134a in trihexyltetradecylphosphonium 1,1,2-trifluoro-2-(perfluoroethoxy) ethanesulfonate ([P14666] [TPES]) and tributyltetradecyl phosphonium 1,1,2,3,3,3-hexafluoropropanesulfonate ([P14444][HFPS]). Sousa et al [23,24] studied the solubilities of trifluoromethane, difluoromethane and fluoromethane in trihexyltetradecylphosphonium bis (trifluoromethylsulfonyl) amid ( PO 4 ].…”

Section: Introductionmentioning

confidence: 99%

Gaseous absorption of fluorinated ethanes by ionic liquids

Liu

et al. 2015

Fluid Phase Equilibria

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Solubility of hydrofluorocarbons in phosphonium-based ionic liquids: Experimental and modelling study

Cited by 27 publications

References 30 publications

Phase Equilibria, Diffusivities, and Equation of State Modeling of HFC-32 and HFC-125 in Imidazolium-Based Ionic Liquids for the Separation of R-410A

Phase Equilibria, Diffusivities, and Equation of State Modeling of HFC-32 and HFC-125 in Imidazolium-Based Ionic Liquids for the Separation of R-410A

Phase Equilibria of trans-1,3,3,3-Tetrafluoropropene with Three Imidazolium Ionic Liquids

Gaseous absorption of fluorinated ethanes by ionic liquids

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