Synthesis and fire-extinguishing properties of monobromotrifluoropropene

摘要

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, (CF_3CBrCH_2, CAS Code 1514-82-5) for its high fire extinguishing efficiency and short atmospheric lifetime. In this paper, a synthesize method for CF_3CBrCH_2 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 CF_3CBrCH_2 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 CF_3CBrCH_2 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 CF_3CBrCH_2 is measured in a confined room. From experimental results, it is concluded that the binary fire extinguishing agent of nitrogen and CF_3CBrCH_2 owns higher fire extinguishing efficiency and its spray characteristics are perfect, so it is a kind of potential Halon alternatives.