Patent ID: 6924402
Filing Date: 2005-08-02
Classification: C07C

Abstract:
1. A process for simultaneously preparing tetrafluoroethylene (TFE) and hexafluoropropylene (HFP) comprising the steps of: performing pyrolysis of difluorochloromethane (R22) pre-heated at 150 to 250° C. with super-heated steam at a temperature of from 730 to 760° C. and a residence time of from 0.01 to 0.2 seconds; and recycling hexafluoropropylene (HFP) produced from said pyrolysis and unreacted difluorochloromethane (R22) to a reactor, wherein a molar ratio of super-heated steam and difluorochloromethane (R22) ([H a molar ratio of hexafluoropropylene (HFP) produced from said pyrolysis and unreacted difluorochloromethane (R22) ([HFP]/[R22]) is in the range of 0.01 to 0.1.