Vapor-liquid equilibrium of 2,3,3,3-tetrafluoroprop-1-ene with 1-butyl-3-methylimidazolium hexafluorophosphate, 1-hexyl-3-methyl imidazolium hexafluorophosphate, and 1-octyl-3-methylimidazolium hexafluorophosphate

Zhang, Yao; Yin, Jiajia; Wang, Xiaopo

doi:10.1016/j.molliq.2018.03.112

Cited by 22 publications

(21 citation statements)

References 20 publications

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“…61 Noteworthy, an analogous sorption behavior has been observed, i.e., the solubility of R32 and R134a in ionic liquids are systematically reported to be 2-4 times greater than that of R1234y. [62][63][64][65] Therefore, to further explore the rationale behind these results, the condensability differences among penetrants were normalized by calculating the activity-basis Henry's law solubility in terms of the product . 22 The results, plotted in Figure S3 of the Supporting Information as a function of gas critical volume, show that the activity-basis Henry's law coefficient decreases with increasing critical volume (a variable related to penetrant size), which is consistent with the fact that more energy of mixing is required to open larger gaps in the polymer matrix to allocate larger penetrants.…”

Section: Solubility and Diffusivity In Pebax® 1657mentioning

confidence: 99%

Separation of Refrigerant Gas Mixtures Containing R32, R134a, and R1234yf through Poly(ether-block-amide) Membranes

Pardo

Zarca

Urtiaga

2020

ACS Sustainable Chem. Eng.

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Hydrofluorocarbons (HFCs) are powerful greenhouse gases whose production and consumption must be phased-down in order to reach the reduction goals established by the Kigali Amendment to the Montreal Protocol. However, the share of recycled refrigerant gases remains very low owing to the extremely inefficient separation of refrigerant mixtures by cryogenic distillation. In this sense, the HFCs difluoromethane (R32, GWP = 675) and 1,1,1,2tetrafluoroethane (R134a, GWP = 1430), together with the hydrofluoroolefin (HFO) 2,3,3,3tetrafluoropropene (R1234yf, GWP = 4), are among the most common constituents of HFC/HFO refrigerant mixtures currently employed in the refrigeration and air conditioning sector. Therefore, the feasibility of using membrane technology for the selective separation of these compounds is assessed in this work for the first time. A comprehensive study of their gas permeation through several poly(ether-block-amide) (PEBA) membranes that differ on the content and type of backbone segments is performed. Results show that PEBA membranes exhibit superior permeability of R32 (up to 305 barrer) and R134a (up to 230 barrer) coupled with reasonably high selectivity for the gas pairs R32/R1234yf (up to 10) and R134a/R1234yf (up to 8). Moreover, for the blends R32/R1234yf and R32/R134a, the membrane separation performance is not significantly affected under the mixed-gas conditions tested. Thus, results evidence that consideration should be given to membrane technology for the cost-efficient separation of HFCs/HFOs mixtures in order to boost the recycling of these compounds.

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Section: Solubility and Diffusivity In Pebax® 1657mentioning

confidence: 99%

Separation of Refrigerant Gas Mixtures Containing R32, R134a, and R1234yf through Poly(ether-block-amide) Membranes

Pardo

Zarca

Urtiaga

2020

ACS Sustainable Chem. Eng.

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“…[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. 35 In this sense, ILs provide several benefits over conventional molecular solvents in the design of separation processes because solvent evaporation is avoided, and they are not flammable nor corrosive and do not release toxic vapors.…”

Section: Introductionmentioning

confidence: 99%

“…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 nonflammability, among others. − The use of ILs as entrainers has been proposed to allow for the separation of azeotropic or close-boiling point blends of refrigerant gases − and as working fluids in absorption refrigeration systems. − 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 . In this sense, ILs provide several benefits over conventional molecular solvents in the design of separation processes because solvent evaporation is avoided, and they are not flammable nor corrosive and do not release toxic vapors .…”

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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“…For the isobaric VLE measurement, a modified Rose type recirculating equilibrium still was used, which was presented in detail in the literatures. − The experiment pressure was maintained by a manometer (Nanjing Hengyuan Automatic Gauge Co., Ltd.), and the pressure fluctuation was controlled within 1 kPa with a two-step automatic control scheme. Meanwhile, a mercury thermometer was used to measure the equilibrium temperature with an accuracy of ±0.1 K.…”

Section: Methodsmentioning

confidence: 99%

Vapor–Liquid Phase Equilibrium for Separation of Isopropanol from Its Aqueous Solution by Choline Chloride-Based Deep Eutectic Solvent Selected by COSMO-SAC Model

Jiang

Zhang

et al. 2019

J. Chem. Eng. Data

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To separate isopropanol from its aqueous solution by distillation, the deep eutectic solvents (DESs) with choline chloride, which were screened using the COSMO-SAC mode, were applied to eliminate the azeotropic point. The charge density distribution over the molecular surface was calculated for isopropanol, water, and DESs to analyze the interactions between different species. Based on the screening results, a DES consisting of choline chloride and triethylene glycol in a molar ratio of 1:3 was selected. To validate the selected DES for the separation of isopropanol from its aqueous solution, the isobaric vapor–liquid equilibrium (VLE) data for the system of isopropanol + water + DES were measured at a pressure of 101.3 kPa. According to the measured VLE data, the azeotropic point of isopropanol and water can be eliminated by the DES at a concentration of 10 wt %. Meanwhile, the thermodynamic consistency of the VLE data was checked by the van Ness test. The non-random two-liquid model was employed to correlate the VLE data, which were in agreement with the measured VLE data.

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Vapor-liquid equilibrium of 2,3,3,3-tetrafluoroprop-1-ene with 1-butyl-3-methylimidazolium hexafluorophosphate, 1-hexyl-3-methyl imidazolium hexafluorophosphate, and 1-octyl-3-methylimidazolium hexafluorophosphate

Cited by 22 publications

References 20 publications

Separation of Refrigerant Gas Mixtures Containing R32, R134a, and R1234yf through Poly(ether-block-amide) Membranes

Separation of Refrigerant Gas Mixtures Containing R32, R134a, and R1234yf through Poly(ether-block-amide) Membranes

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 Phase Equilibrium for Separation of Isopropanol from Its Aqueous Solution by Choline Chloride-Based Deep Eutectic Solvent Selected by COSMO-SAC Model

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