Method of making difluoromethane, 1,1,1-trifluoroethane and...

Details Method of making difluoromethane, 1,1,1-trifluoroethane and... Method of making difluoromethane, 1,1,1-trifluoroethane and...

2006-09-26

2006-09-26

Price, Elvis O. (Department: 1621)

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

Organic compounds

Halogen containing

C570S164000, C570S165000, C570S166000

Reexamination Certificate

active

07112708

ABSTRACT:
A process for the production of difluoromethane (HFC-32), 1,1,1-trifluoroethane (HFC-143a) and 1,1-difluoroethane (HFC-152a). In the process the following steps are employed:(a) providing a reaction vessel,(b) providing in the reaction vessel activated carbon impregnated with a strong Lewis acid fluorination catalys selected from halides of As, Sb, Al, Tl, In, V, Nb, Ta, Ti, Zr and Hf,(c) activating the catalyst by passing through the activated carbon impregnated with a strong Lewis acid fluorination catalyst anhydrous hydrogen fluoride gas and chlorine gas,(d) contacting, in a vapor state in the reaction vessel containing the activated catalyst, hydrogen fluoride and one or more halogenated hydrocarbons selected from chlorofluoromethane, dichloromethane, 1,1,1-trichloroethane, vinyl chloride, 1,1-dichloroethylene, 1,2-dichloroethylene, 1,2-dichloroethane, and 1,1-dichloroethane for a time and at a temperature to produce a product stream comprising hydrofluorocarbon product(s) corresponding to the chlorinated hydrocarbon reactant(s), and one or more of hydrogen chloride, unreactacted chlorinated hydrocarbon reactant(s), under-fluorinated intermediates, and unreacted hydrogen fluoride, and(e) separating the hydrofluorocarbon product(s) from the product stream.

REFERENCES:
patent: 2744148 (1956-05-01), Ruh et al.
patent: 2745886 (1956-05-01), Ruh et al.
patent: 2749274 (1956-06-01), Ruh et al.
patent: 2749375 (1956-06-01), Ruh et al.
patent: 3862995 (1975-01-01), Martens et al.
patent: 4147733 (1979-04-01), Fishe et al.
patent: 5208395 (1993-05-01), Elsheikh
patent: 5672786 (1997-09-01), Bonniface et al.
patent: 6080899 (2000-06-01), Bradley et al.
patent: 6242659 (2001-06-01), Requieme et al.
patent: 0712826 (1996-05-01), None

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