2-氢七氟丙烷在不同温度下的热分解

采用快速热解法以及傅里叶变换红外光谱(FTIR)和气相色谱/质谱(GC/MS)检测技术，研究了2-氢七氟丙烷在驻留时间为30 s，反应温度分别为400, 500, 600, 700和800 ℃时的热分解过程。结果发现：反应温度对2-氢七氟丙烷的热分解有明显的影响，2-氢七氟丙烷在400，500和600 ℃时是稳定的，在700 ℃时明显地开始分解，800 ℃时发生了强烈的分解。与此同时，在800 ℃时，在反应器的管壁上观察到了大量的焦炭，并在热分解产物中发现了1,2-二(三氟甲基)全氟茚满、全氟(1-亚乙基茚满) 和八氟化萘等三种环状化合物，这表明2-氢七氟丙烷在高温热分解过程中并不只是发生了简单的分解，环化和聚合过程也是会发生的。

Thermal Decomposition of 2-H-Heptafluoropropane at Different Temperatures

The thermal decomposition processes of 2-H-heptafluoropropane were investigated during a 30 second reaction time and at temperatures of 400, 500, 600, 700 and 800 degrees C using fast pyrolysis method and Fourier transform infrared spectra (FTIR) and gas chromatography/mass spectrometry (GC/MS) analytical techniques. The results indicate that the reaction temperatures have the obvious effects on the thermal decomposition of 2-H-heptafluoropropane. The 2-H-heptafluoropropane is steady at first three temperatures, whereas starts to obviously decompose at 700 degrees C and undergoes intense decomposition at 800 degrees C. At the same time, coke formation was observed on the surface of the reactor at 800 degrees C. Moreover, three cyclocompounds, 1,2-bis(trifluoromethyl) perfluoroindane, perfluoro(1-ethylideneindane) and octafluoronaphthalene, were for the first time discovered in the products of thermal decomposition at 800 degrees C. This demonstrates that 2-H-heptafluoropropane experiences not only simple decomposition, but also cyclization and the polymerization reactions under high temperature thermal decomposition conditions.