Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1992-11-12
1994-08-02
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C07C 1708
Patent
active
053347870
ABSTRACT:
An improved process for the manufacture of CF.sub.3 CHF.sub.2 by contacting 1,2-dichloro-1,1,2-trifluoroethane (CClF.sub.2 CHClF) or 1-chloro-1,1,2,2-tetrafluoroethane (CHF.sub.2 CClF.sub.2) or mixtures of CF.sub.3 CHCl.sub.2 and CClF.sub.2 CHClF or mixtures of CF.sub.3 CHClF and CHF.sub.2 CClF.sub.2 with HF in the presence of a Cr.sub.2 O.sub.3 catalyst prepared by pyrolysis of ammonium dichromate, the reaction being conducted under controlled conditions whereby the production of CF.sub.3 CHF.sub.2 is maximized, and the formation of chloropentafluoroethane (CF.sub.3 CClF.sub.2) and other perhalo derivatives is minimized. The subject hydrogen-containing compound is useful as a blowing agent, propellant, refrigerant, fire extinguishing agent, or sterilant carrier gas.
REFERENCES:
patent: 3258500 (1966-06-01), Swamer et al.
patent: 3755477 (1973-08-01), Firth et al.
patent: 4158675 (1979-06-01), Potter
patent: 4843181 (1989-06-01), Gumprecht
patent: 5087329 (1992-02-01), Felix
Felix Vinci M.
Gumprecht William H.
Mahler Barry A.
Boyer Michael K.
E. I. Du Pont de Nemours and Company
Siegel Alan
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