Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
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
Merkel Daniel C
Shankland Ian
Tung Hsuehsung
Honeywell International , Inc.
Price Elvis O.
Szuch Colleen
LandOfFree
Method of making difluoromethane, 1,1,1-trifluoroethane and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making difluoromethane, 1,1,1-trifluoroethane and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making difluoromethane, 1,1,1-trifluoroethane and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3533392