Appeal No. 2001-2396
Application 09/286,150
CF CCl CF with hydrogen contains common hydrogenation catalysts3 2 3
such as Cu, Ni, Cr or combinations thereof, optionally promoted
with compounds of Mo, V, W, Ag, Fe, K, Ba or combinations
thereof, optionally on a support (col. 10, lines 28-68). Even if
this catalyst is suitable for reacting CF CCl CF with hydrogen,3 2 3
Webster’s method differs from that in the appellants’ claims 1
and 16 in that the disclosed supports do not include carbon, and
the product is hexafluoropropylene rather than the appellants’
1,1,1,3,3-pentafluoropropene.
The examiner argues that Webster teaches that his catalyst
gives superior results compared to palladium catalyst (answer,
pages 4-5). Webster teaches (col. 10, lines 28-38):
While any hydrogenation catalyst could be used, the
most active catalysts, such as Pt and Pd, are poor
selections because, in addition to the desired
products, they lead to the addition of hydrogen across
any double bond present or to the substitution of
hydrogen for chlorine, thus reducing the yield of
desired products and requiring recycle. These effects
are not desirable, but do not substantially reduce the
overall yield to hexafluoropropylene, because the
hydrogen-containing by-products can be recycled to the
chlorofluorination step.
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