Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1993-05-24
1994-10-11
Richter, Johann
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
570134, 570137, 570165, C07C 1708
Patent
active
053549287
ABSTRACT:
The invention relates to a process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane.
The process which consists of gas phase catalytic fluorination of at least one pentahaloethane of formula C.sub.2 HX.sub.2-n F.sub.3+n in which X denotes a chlorine or bromine atom and n the number 0 or 1, by hydrofluoric acid, is characterized in that a catalyst is employed consisting of a catalytic quantity of chromium in an oxidation state equal to or greater than 3 and of an activated charcoal as support.
The selectivity for 1,1,1,2-tetrafluorochloroethane and pentafluoroethane reaches approximately 95% and even more.
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Cheminal Bernard
Lacroix Eric
Lantz Andre
Hydorn Michael B.
Richter Johann
Societe Atochem
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