Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2007-10-23
2007-10-23
Parsa, J. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C570S175000
Reexamination Certificate
active
10572626
ABSTRACT:
A process is disclosed for the manufacture of CF3CH2CHF2and CF3CHFCH2F. The process involves (a) reacting hydrogen fluoride, chlorine, and at least one halopropene of the formula CX3CCl═CClX (where each X is independently F or Cl) to produce a product including both CF3CCl2CClF2and CF3CClFCCl2F; (b) reacting CF3CCl2CClF2and CF3CClFCCl2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2, and CF3CHFCH2F; and (c) recovering CF3CH2CHF2and CF3CHFCH2F from the product produced in (b). In (a), the CF3CCl2CClF2and CF3CClFCCl2F are produced in the presence of a chlorofluorination catalyst including a ZnCr2O4/crystalline α-chromium oxide composition, a ZnCr2O4/crystalline α-chromium oxide composition which has been treated with a fluorinating agent, a zinc halide/α-chromium oxide composition and/or a zinc halide/α-chromuim oxide composition which has been treated with a fluorinating agent.
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Rao Velliyur Nott Mallikarjuna
Sievert Allen C.
E.I. du Pont de Nemours and Company
Parsa J.
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