Gaseous absorption of 2,3,3,3-tetrafluoroprop-1-ene in three imidazolium-based 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

“…To validate the reliability and accuracy of our experimental system, the solubility of R1234yf in 2 presents the results of the validation experiments and Figure 1 shows the excellent agreement with published data. 25,34 Experimental solubility data were modeled using the non-random two-liquid model (NRTL), an activity-coefficient model widely applied to this type of systems. 10,34,49 The vapor-liquid equilibria for each component of a mixture can be described by:…”

“…[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.…”

“…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 .…”

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

“…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.…”

Solubility for Propane and Isobutane in [P66614]Cl from 278.15 to 348.15 K

“…Small equipment volume is needed using R32/[hmim]­[Tf 2 N] and R152a/[hmim]­[Tf 2 N] pairs owing to the evaporation pressure, particularly the pressure for R32/[hmim]­[Tf 2 N] is about 2 orders of magnitude higher than that in H 2 O/LiBr systems. Our research group − has also carried out a series of experiments on refrigerant/IL working pairs.…”