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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

  • Ana Rita C. Morais
    Ana Rita C. Morais
    Department of Chemical & Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
  • Abby N. Harders
    Abby N. Harders
    Department of Chemical & Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
    Institute for Sustainable Engineering, University of Kansas, Lawrence, Kansas 66045, United States
  • Kalin R. Baca
    Kalin R. Baca
    Department of Chemical & Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
    Institute for Sustainable Engineering, University of Kansas, Lawrence, Kansas 66045, United States
  • Greta M. Olsen
    Greta M. Olsen
    Department of Chemical & Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
    Institute for Sustainable Engineering, University of Kansas, Lawrence, Kansas 66045, United States
  • Bridgette J. Befort
    Bridgette J. Befort
    Department of Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
  • Alexander W. Dowling
    Alexander W. Dowling
    Department of Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
  • Edward J. Maginn
    Edward J. Maginn
    Department of Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
  • , and 
  • Mark B. Shiflett*
    Mark B. Shiflett
    Department of Chemical & Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
    Institute for Sustainable Engineering, University of Kansas, Lawrence, Kansas 66045, United States
    *Email: [email protected]
Cite this: Ind. Eng. Chem. Res. 2020, 59, 40, 18222–18235
Publication Date (Web):September 4, 2020
https://doi.org/10.1021/acs.iecr.0c02820
Copyright © 2020 American Chemical Society

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    Abstract

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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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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.iecr.0c02820.

    • Comparison of VLE data for HFC-32 in [C4C1im][PF6] and [C4C1im][BF4], and HFC-125 in [C4C1im][PF6]; comparison of excess Gibbs energy for HFC-32 and HFC-125 in [C4C1im][PF6], [C4C1im][BF4], [C6C1im][FAP], [C6C1im][Cl], [C4C1im][C1CO2], and [C4C1im][SCN]; and diffusion coefficient analysis for HFC-125 in [C6C1im][FAP] (PDF)

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