Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2011-03-15
2011-03-15
Parsa, Jafar (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C570S124000
Reexamination Certificate
active
07906693
ABSTRACT:
A process is disclosed for making CH2═CFCF3. The process involves contacting CH2ClCF2CF3with H2in a reaction zone in the presence of a catalyst including a catalytically effective amount of palladium supported on a support selected from chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, aluminum fluoride and/or fluorinated alumina, to produce CH2═CFCF3. The mole ratio of H2to the CH2ClCF2CF3fed to the reaction zone is between about 1:1 and about 4:1. Also disclosed is another process for making CH2═CFCF3that involves (a) reacting CH2ClCF2CF3with H2in the presence of a catalytically effective amount of hydrogenation catalyst to form CH3CF2CF3; and (b) dehydrofluorinating CH3CF2CF3from (a) to form CH2═CFCF3; and another process for making CH2═CFCF3that involves (1) dehydrofluorinating CH2ClCF2CF3in the presence of a catalytically effective amount of dehydrofluorination catalyst to form CHCl═CFCF3; and (2) hydrogenating CHCl═CFCF3from (1) in the presence of a hydrogenation catalyst including a catalytically effective amount of palladium supported on a support selected from chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, aluminum fluoride and/or fluorinated alumina to form CH2═CFCF3. Also disclosed is a process for making CH2ClCF2CF5. This process involves reacting CH2ClF with CF2═CF2in a reaction zone in the presence of a catalytically effective amount of an aluminum halide composition having a bulk formula of AlClxBryF3-x-ywherein the average value of x is 0 to 3, the average value of y is 0 to 3-x, provided that the average values of x and y are not both 0. Also disclosed is an azeotropic composition including CF3CF═CHCl and HF.
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Haszeldine R N et al.: “Addition of Free Radicals to Unsaturated Systems. Part XIII. Direction of Radical Addition to Chloro-1:1-Difluoroethylne” Journal of the Chemical Society. Letchworth, GB, 1957, pp. 2193-2196, XP009081235.
Nappa Mario Joseph
Rao Velliyur Nott Mallikarjuna
Sievert Allen Capron
E.I. Du Pont de Nemours and Company
Parsa Jafar
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