六氟乙烷的热分解特性

Characteristics of Perfluoroethane Thermal Decomposition

采用管式炉研究了950～1100℃温度区间C2F6的分解特性,并研究了C2F6的初始浓度、反应温度、停留时间对C2F6分解率的影响.实验结果表明,C2F6初始浓度越低、温度越高、反应时间越长,C2F6分解率就越高.同时,热解反应的反应级数应该介于0和1之间.在温度为1100℃,C2F6初始浓度为223.21μmol/L,停留时间为2s时,C2F6分解率高达90%.根据Arrhenius方程计算,在950～1100℃,C2F6热分解反应的活化能(Ea)为313.2kJ/mol,频率因子(A)为8.8×1011s-1.

Perfluorocarbons（PFCs） gases have high global warming potential （GWP） and a long lifetime in the atmosphere. It is difficult to decompose these gases due to their tetrahedral structure arising from strong C-F bonds. This paper discussed C2F6 （one of PFCs gases ） thermal decomposition characteristic under 950-1100 ℃ in a laboratory scale reactor. The effects of C2F6 initial concentration, reaction temperature, residence time on C2F6 decomposition ratio were also investigated. The experimental results indicate that the lower initial C2F6 concentration, higher reaction temperature, longer residence time can promote C2F6 decomposition ratio. On the basis of the results, it can be drawn that the reaction order of C2F6 thermal decomposi- tion is between 0 and 1. Above 90% C2F6 decomposition ratio can be achieved under a temperature of 1100 ℃, 223.21 μmol/L initial C2F6 concentration and 2 s residence time. Basis on the calculation, the activation energy（Ea） and the frequency factor（A） of C2F6 thermal decomposition in the temperature range of 950- 1100 ℃ were 313.2 kJ/mol and 8.8 ×10^11s^-1, respectively.