Appeal No. 1995-4851
Application 08/167,656
effective amount of at least one metal selected from iron,
manganese, magnesium and nickel, on a fluorinated alumina
support (col. 2, lines 15-24). The metals can be in a many
forms including fluorides (col. 2, lines 49-57). The total
fluorine content of the catalyst taken as AlF corresponds to
3
at least 90 wt%, preferably at least 95 wt%, exclusive of the
metal (i.e., iron, manganese, magnesium and nickel) (col. 2,
lines 39-47). The metal content of the catalyst, expressed as
the divalent oxide, is not more than 50
wt% (col. 2, line 67 - col. 3, line 1). The process is said
to achieve high selectivity of the above products by
minimizing the formation of trifluorochloroethane, which is
the product recited in appellants’ claims, through catalyst
selection and control of reaction variables (col. 2, lines 1-
5). Regarding control of reaction variables, Manzer states
(col. 3, line 62 - col. 4, line 3):
In general, with a given catalyst composition,
the higher the temperature, the greater the
HF/trihaloethylene and/or tetrahaloethane mol ratio,
and the longer the contact time, the greater is the
conversion to fluorinated products and the greater
is the production of polyfluorinated products. The
above variables can be balanced, one against the
other, so that formation of CClF CH Cl and/or
2 2
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