Through the PTFE thermal decomposition reaction experiment conducted in the tubular pyrolysis reactor, the following conclusions can be drawn. (1) The influence of the final pyrolysis temperature-when the final temperature reaches 450°C, the waste starts to partially decompose; the thermal decomposition rate increases with the increase of the final pyrolysis temperature and the extension of the duration at this temperature, and eventually stabilizes; pyrolysis The degree of residue coking is positively related to the final pyrolysis temperature; the increase of the final pyrolysis temperature is very beneficial to increase the thermal decomposition rate.
The method has simple equipment, convenient operation, low energy consumption, thorough pyrolysis of raw materials, high recovery rate, basically no residual waste, and has industrial value. Several balance experiments under this condition show that the thermal decomposition rate of the waste material can reach 48. (4) High temperature pyrolysis PTFE waste product: tetrafluoroethylene octafluorocyclobutane and other substances are high in content, which can be used in the industrial production of hexafluoropropylene; at the same time, the inorganic filler in the waste can be completely separated and can be recycled .
Within the scope of the design experiment, the sequence of the significance of the PTFE Fusing Belts influence factors on the pyrolysis of waste materials is selected as follows: final pyrolysis temperature final temperature duration heating rate.6% (the waste material contains 55% polytetrafluoroethylene).. (2) The effect of heating rate: the thermal decomposition rate of waste materials decreases with the increase of the heating rate; under the same pyrolysis final temperature, the heating rate increases and the thermal decomposition rate decreases.
The influence of waste particle size: Compared with large-sized waste particles, powdered particles have obvious advantages. Through the analysis of variance and weighing economic factors, the best experimental operating conditions are obtained: the final pyrolysis temperature is 550℃, the final pyrolysis temperature duration is 20 min, and the heating rate is 15K/min. Appropriate reduction of particle size is beneficial to increase the thermal decomposition rate
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