Process or the preparation of 1,1,1,3,3,3-hexafluoro-propane...

Details Process or the preparation of 1,1,1,3,3,3-hexafluoro-propane... Process or the preparation of 1,1,1,3,3,3-hexafluoro-propane...

2006-08-04

2011-11-08

Katakam, Sudhakar (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C570S165000, C570S169000

Reexamination Certificate

active

08053611

ABSTRACT:
A process is disclosed for the manufacture of 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and/or 1,1,1,2,3,3,3-heptafluoropropane. The process involves (a) reacting HF, Cl2, and at least one halopropene of the formula CX3CCl═CClX (where each X is independently F or Cl) to produce a product comprising CF3CCl2CF3and CF3CClFCClF2; (b) reacting CF3CCl2CF3and CF3CClFCClF2produced in (a) with hydrogen, optionally in the presence of HF, to produce a product comprising CF3CH2CF3and at least one of CHF2CHFCF3, CF3CF═CF2and CF3CFHCF3; and (c) recovering from the product produced in (b), CF3CH2CF3and at least one of CHF2CHFCF3, CF3CF═CF2and CF3CFHCF3. In (a), the CF3CCl2CF3and CF3CClFCClF2are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and/or (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.

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