Treatment method for decomposing perfluorocompound,...

Details Treatment method for decomposing perfluorocompound,... Treatment method for decomposing perfluorocompound,...

2003-08-20

2008-10-14

Caldarola, Glenn (Department: 1797)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

Reexamination Certificate

active

07435394

ABSTRACT:
An object of the present invention is to improve the decomposition at low temperatures of perfluorocompounds containing only fluorine as a halogen, such as CF4, C2F6and the like. In the present invention, a perfluorocompound containing only fluorine as a halogen is brought into contact with a catalyst comprising Al, Ni and W as catalytically active ingredients and comprising a mixed oxide or complex oxide of Ni and Al and a mixed oxide or complex oxide of W and Ni, in the presence of steam or a combination of steam and air at a temperature of 500 to 800° C. to convert the fluorine in the perfluorocompound to hydrogen fluoride. Employment of the catalyst of the present invention improves the decomposition at low temperatures and hence makes it possible to decompose the perfluoro-compound at a high percentage of decomposition at a lower temperature.

REFERENCES:
patent: 6468490 (2002-10-01), Shamouilian et al.
patent: 885648 (1998-12-01), None
patent: 10-192653 (1998-07-01), None
patent: 11-70322 (1999-03-01), None
patent: 11-244656 (1999-09-01), None

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