Production of fluorocarbons employing two catalyst zones

Details Production of fluorocarbons employing two catalyst zones Production of fluorocarbons employing two catalyst zones

1977-01-21

1978-05-09

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2606537, 2606538, C07C 1710

Patent

active

040887049

ABSTRACT:
Highly chlorinated hydrocarbons having one to three carbons such as CCl.sub.4, C.sub.2 Cl.sub.6 and C.sub.3 Cl.sub.8 are reacted with HF in the presence of a fluorination catalyst such as gamma aluminum fluoride. The effluent is reacted with unhalogenated or underhalogenated hydrocarbons having 1 to 3 carbons, such as CH.sub.4, CH.sub.3 Cl, C.sub.2 H.sub.5 Cl, C.sub.2 H.sub.6, CH.sub.2 .dbd.CHCl and CFCl.dbd.CCl.sub.2, and O.sub.2 in the presence of an oxychlorination catalyst, such as cupric chloride with alkali halide or alkaline earth halide promoters on alpha aluminum fluoride. Fluorocarbons having 1 to 3 carbons such as CCl.sub.2 F.sub.2, C.sub.2 Cl.sub.3 F.sub.3 and C.sub.2 Cl.sub.2 F.sub.4 are separated from the effluent. Preferably, highly chlorinated materials are recycled onto the fluorination catalyst and underhalogenated materials are recycled onto the oxychlorination catalyst.

REFERENCES:
patent: 3476817 (1969-11-01), Vecchio
patent: 3652692 (1972-03-01), Vecchio et al.
patent: 3793229 (1974-02-01), Groppelli et al.

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