Process for the preparation of 1,1,1,3,3-pentafluoropropane...

Details Process for the preparation of 1,1,1,3,3-pentafluoropropane... Process for the preparation of 1,1,1,3,3-pentafluoropropane...

2007-10-23

2007-10-23

Parsa, J. (Department: 1621)

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

Organic compounds

Halogen containing

C570S176000

Reexamination Certificate

active

10572627

ABSTRACT:
A process for the manufacture of CF3CH2CHF2and CF3CH2CF3is disclosed. The process involves (a) reacting HF and at least one halopropene of the formula CX3CCI=CCIX (where each X is independently F or CI) to produce a product including both CF3CCI=CF2and CF3CHCICF3; (b) reacting CF3CCI=CF2and CF3CHCICF3produced in (a) with hydrogen to produce a product including both CF3CH2CHF2and CF3CH2CF3; and (c) recovering CF3CH2CHF2and CF3CH2CF3from the product produced in (b). In (a), the CF3CCI=CF2and CF3CHCICF3are produced in the presence of a fluorination 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-chromium oxide composition which has been treated with a fluorinating agent.

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