Compositions – Vaporization – or expansion – refrigeration or heat or energy...
Reexamination Certificate
2011-07-19
2011-07-19
McGinty, Douglas (Department: 1765)
Compositions
Vaporization, or expansion, refrigeration or heat or energy...
C510S177000, C510S408000, C510S412000
Reexamination Certificate
active
07981311
ABSTRACT:
Halocarbons of the structure CF3CF2CH2X, wherein X is either F or Cl or mixtures thereof prepared by: contacting at least one 2-fluorochloropropane with hydrogen fluoride in a first fluorination step in the gas phase or liquid phase under substantially anhydrous conditions, in the absence of added catalyst to partially fluorinate said 2-fluorochloropropane; contacting said partially fluorinated 2-fluorochloropropane with at least the stoichiometric molar equivalent of hydrogen fluoride under substantially anhydrous conditions, in the presence of at least one fluorination catalyst in a second fluorination step; removing said reaction products from contact with said catalyst, and isolating a substantial yield of at least 1,1,1,2,2,3-hexafluoropropane or 1,1,1,2,2,penta-3-chloropropane, or mixtures thereof, respectively.
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Knapp Jeffrey P.
Nappa Mario Joseph
Rao Velliyur Nott Mallikarjuna
Sievert Allen Capron
E. I. Du Pont de Nemours and Company
McGinty Douglas
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