Simultaneous preparation of tetrafluoroethylene and...

Details Simultaneous preparation of tetrafluoroethylene and... Simultaneous preparation of tetrafluoroethylene and...

2005-08-02

2005-08-02

Price, Elvis O. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C570S153000

Reexamination Certificate

active

06924402

ABSTRACT:
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.

REFERENCES:
patent: 2759983 (1956-08-01), Waddell
patent: 3009966 (1961-11-01), Hauptschein et al.
patent: 3446858 (1969-05-01), Shingu et al.
patent: 4849554 (1989-07-01), Cresswell et al.
patent: 0287219 (1992-05-01), None
patent: 904022 (1962-08-01), None
patent: 960309 (1964-06-01), None
patent: 1041738 (1966-09-01), None

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