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Vapor–Liquid Equilibrium and PVTx Property Measurements of HFO1123 + CF3I and HFC125 + CF3I

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Abstract

Vapor–liquid equilibrium (VLE) of binary refrigerant blends, HFO1123 + CF3I and HFC125 + CF3I, were measured at temperature range from 263 to 323 K by the recirculation method. A sample was filled into an equilibrium cell of the experimental apparatus equipped with optical windows in the vapor–liquid equilibrium condition, and the saturated vapor and liquid were extracted from each phase in small quantities. The compositions of the samples were measured by a gas chromatograph with a thermal conductivity detector and a Porapak-Q column. The expanded uncertainties in temperature, pressure, and composition are estimated to be 10 mK, 3.0 kPa, and 0.007 mol·mol−1, respectively. Based on the experimental data, mixing parameters of a cubic equation of state (PR EOS) and Helmholtz energy EOSs were determined. The VLE behavior (temperature, pressure, and composition relation) calculated from the PR EOS and the Helmholtz energy EOSs show good agreement with each other. The PR EOS reasonably represents the VLE data with an absolute average deviation (AAD) of 1.8% for HFO1123 + CF3I and that of 1.1% for HFC125 + CF3I in pressure, and with an AAD of 0.012 mol·mol−1 in mole fraction for both mixtures. In addition, PVTx properties of HFO1123 + CF3I and HFC125 + CF3I blends were measured from 300 to 400 K and at pressures up to 6.9 MPa by the isochoric method. The expanded uncertainties in temperature and pressure are estimated to be 5 mK and 1.0 kPa (k = 2). The relative expanded uncertainties in density and mass fraction are estimated to be 0.0015 and 0.0005 (k = 2), respectively. The Helmholtz energy EOSs with the mixing parameters determined on the basis of the VLE data were compared with the experimental PVTx property data, and the EOSs represent them in the vapor phase except for the isochores near the critical density with an AAD of 0.9% in density.

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Acknowledgements

This research has been supported by a grant from New Energy and Industrial Technology Development Organization (NEDO), Japan. We are grateful to AGC, Inc., Chemours-Mitsui Fluorochem Co., Ltd. Japan, and Tosoh Finechem Co., Japan for providing the high purity samples of HFO1123, HFC125, and CF3I, respectively.

Funding

This work is based on results obtained from a project, P18005, commissioned by the New Energy and Industrial Technology Development Organization (NEDO), Japan.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

    Naoya Sakoda, Kentaro Kitabatake & Hiroaki Ishimaru

  2. Research Center for Next Generation Refrigerant Properties (NEXT-RP), International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan

    Naoya Sakoda & Yukihiro Higashi

Authors
  1. Naoya Sakoda
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  2. Kentaro Kitabatake
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  3. Hiroaki Ishimaru
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  4. Yukihiro Higashi
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Contributions

N.S. wrote the manuscript, prepared the figures, set up the experiments, and analyzed the data. K.K. and H.I. conducted the experiments and analyzed the data. Y.H. prepared the samples, conducted the experiments, analyzed the data, and supervised the work. All authors reviewed the manuscript.

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Correspondence to Naoya Sakoda.

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Sakoda, N., Kitabatake, K., Ishimaru, H. et al. Vapor–Liquid Equilibrium and PVTx Property Measurements of HFO1123 + CF3I and HFC125 + CF3I. Int J Thermophys 45, 9 (2024). https://doi.org/10.1007/s10765-023-03286-z

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