Process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane
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United States of America Patent
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Oct 11, 1994
Issued Date -
N/A
app pub date -
May 24, 1993
filing date -
May 11, 1990
priority date (Note) -
Expired
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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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