The present invention relates to a process for simultaneously preparing tetrafluoroethylene
and hexafluoropropylene by the pyrolysis of difluorochloromethane mixed in the
molar ratio of super-heated steam/pre-heated difluorochloromethane ([H2O]/[R22])
of 5-10 under the conditions such as a temperature of 730 C. to 760
C. and a residence time of 0.01 to 0.2 seconds, where the unreacted R22 and produced
HFP are recycled and controlled to have an appropriate molar ratio of HFP/R22 of
0.01 to 0.1 in order to obtain a high yield of HFP. Thus, the pyrolysis process
of the present invention is efficient for preparing TFE and HFP, which are essential
monomers in fluorinated resin industry.
