Synthesis and Fire-extinguishing Properties of Monobromotrifluoropropene.

Abstract: The State Key Laboratory of Fire Science has been investigating bromofluoroalkenes as Halon replacements for several years. One of the leading candidate agents of bromofluoroalkenes is monobromotrifluoropropene, (CF₃CBrCH₂, CAS Code 1514-82-5) for its high fire extinguishing efficiency and short atmospheric lifetime. In this paper, a synthesize method for CF₃CBrCH₂ is studied and the purity of synthesized production is measured by Gas Chromatograph-Time of Flight Mass Spectrometer above all. And then, the conformer, bond length and bond angle of CF₃CBrCH₂ are calculated by ab initio method. According to calculation results, possible decomposed products in high temperature and chemical fire-extinguishing mechanisms in flame are discussed. Finally, in order to make CF₃CBrCH₂ release fire protection area easily, nitrogen is mixed with it to form binary fire extinguishing agent. The fire suppression ability of binary fire- extinguishing agent of nitrogen and CF₃CBrCH₂ is measured in a confined room. From experimental results, it is concluded that the binary fire extinguishing agent of nitrogen and CF₃CBrCH₂ owns higher fire extinguishing efficiency and its spray characteristics are perfect, so it is a kind of potential Halon alternatives. [Copyright &y& Elsevier]