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Phase Behavior of N2O and CO2 in Room-Temperature Ionic Liquids [bmim][Tf2N], [bmim][BF4], [bmim][N(CN)2], [bmim][Ac], [eam][NO3], and [bmim][SCN]

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Abstract

The gas solubility of nitrous oxide (N2O) in room-temperature ionic liquids, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium thiocyanate, and ethylammonium nitrate has been measured at isothermal conditions from about (283 to 348)K using a gravimetric microbalance. The observed pressure–temperature composition (PTx) data have been analyzed by use of a generic Redlich-Kwong equation-of-state (EOS) model, which has been successfully applied in our previous works. The interaction parameters have been determined using our measured vapor–liquid equilibrium data. Vapor–liquid–liquid equilibrium measurements have been made and validate EOS model predictions which suggest that these systems demonstrate Type III and Type V phase behavior, according to the classification of van Konynenburg and Scott. The global phase behavior of N2O has also been compared with both the measured data from this study and literature data for carbon dioxide (CO2) in each ionic liquid and Henry’s law constants are compared at room temperature (298.15 K).

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Authors and Affiliations

  1. DuPont Central Research and Development, Experimental Station, Wilmington, DE, 19880, USA

    Mark B. Shiflett, Anne Marie S. Niehaus & Beth A. Elliott

  2. 32 Kingsford Lane, Spencerport, NY, 14559, USA

    A. Yokozeki

Authors
  1. Mark B. Shiflett
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  2. Anne Marie S. Niehaus
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  3. Beth A. Elliott
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  4. A. Yokozeki
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Correspondence to Mark B. Shiflett.

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Shiflett, M.B., Niehaus, A.M.S., Elliott, B.A. et al. Phase Behavior of N2O and CO2 in Room-Temperature Ionic Liquids [bmim][Tf2N], [bmim][BF4], [bmim][N(CN)2], [bmim][Ac], [eam][NO3], and [bmim][SCN]. Int J Thermophys 33, 412–436 (2012). https://doi.org/10.1007/s10765-011-1150-4

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