利用气相色谱(GC)、 气相色谱-质谱(GC-MS)和傅里叶变换红外光谱(FTIR)研究了六氟丙烷洁净气体灭火剂在管式反应器中500～750 ℃时的热分解性能。 经测试发现热分解气体中含有氟化氢, GC-MS分析发现含有五氟丙烯, 说明六氟丙烷高温热分解时主要是脱去氟化氢、 生成五氟丙烯的过程。 GC和FTIR结果表明, 反应温度对六氟丙烷的热分解有明显影响, 600 ℃时开始发生微弱分解, 750 ℃时发生强烈分解。 FTIR可作为在线研究含氟气体灭火剂灭火机理的新方法。

The thermal decomposition properties of hexafluoropropane clean gaseous fire-extinguishing agent were studied in tubular reactor from 500 to 750 ℃ and the decomposed gas was characterized by gas chromatography(GC), Fourier transform infrared spectroscopy(FTIR) and gas chromatography-mass spectrometry(GC-MS). Hydrogen fluoride was detected after the decomposed gas was analyzed by pH testing, while pentafluoropropylene was found by GC-MS. The results showed that hydrogen fluoride eliminated from hexafluoropropane was the main reaction, while pentafluoropropylene was the primary product during hexafluoropropane decomposition under high temperature. GC and FTIR results indicated that the reaction temperatures had significant effects on the thermal decomposition of hexafluoropropane. Haxafluropropane was steady at 500 ℃, whereas started to decompose weakly at 600 ℃. The degree of the thermal decomposition of hexafluoropropane was enhanced with the temperature increase. And hexafluoropropane underwent intense decompositon at 750 ℃. FTIR can be used as a new method to study extinguishing mechanism of fluorine-containing fire extinguishing agent online.