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Disproportionation reaction of HFO-1123 refrigerant.

Number: pap. 2674

Author(s) : ITO M., KUROKAWA N., DANG C., et al.

Summary

In the field of refrigeration and air conditioning, the transition from using chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) to using hydrofluorocarbon (HFC) as refrigerants has been driven by the need to prevent the depletion of the stratospheric ozone layer. Although HFC refrigerants have low ozone depletion potential, their high global warming potential (GWP) is a serious concern. After the passing of the Kigali Amendment to the Montreal Protocol, UN member nations are now required to switch to low-GWP refrigerants, such as hydrofluoroolefins (HFO), and natural refrigerants. HFO-1123 has very low GWP and should emerge as a new refrigerant in refrigeration and air-conditioning equipment. However, HFO-1123 may undergo a disproportionation reaction under high-temperature and high-pressure conditions. This is a self-decomposition reaction accompanied by significant increases in pressure and temperature. Therefore, to put HFO-1123 into practical use, it is first necessary to develop technology to suppress the disproportionation reaction. The conditions favoring disproportionation of HFO-1123 are influenced by the temperature and pressure of the reaction gas as well as by the activation energy. This reaction can be suppressed by mixing other substances with the refrigerant. In this study, we investigated the effects of mixed substances of varying constituents and concentrations on the suppression of disproportionation at various temperatures and pressures. Using a metallic pressure vessel having a volume of 0.65 L, energy was input by adding molten molybdenum to pure HFO-1123 and to a mixture containing HFO-1123 and other substances under various temperature and pressure conditions. The changes in the pressure and temperature were then measured. Based on the obtained experimental data, the effects of the mixed substances on the reaction were evaluated. Then, a model to estimate the occurrence of disproportionation reactions of HFO-1123 was proposed. The validity of the model was examined using the experimental results.

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Pages: 9

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Details

  • Original title: Disproportionation reaction of HFO-1123 refrigerant.
  • Record ID : 30024713
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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