Appeal 2007-3383
Application 10/452,939
We AFFIRM.
INTRODUCTION
Appellants claim a process for eliminating sulphur from a feed
containing hydrogen sulphide and minimal traces of benzene, toluene and/or
xylene (Specification 1). The method comprises having two reactors in
series wherein in each reactor there is a first, protective catalyst followed by
a second catalyst (catalyst A) (Specification 6; claims 1 and 38).
Claims 1 and 38 are illustrative:
1. A process for eliminating sulphur from a feed containing hydrogen
sulphide, sulphur dioxide, carbon oxysulphide and/or carbon sulphide and a
minimal quantity of benzene, toluene and/or xylenes, said process
comprising:
introducing said feed into a reaction zone comprising two reactors in
series, each reactor containing a bed with a first catalyst, and recovering
elemental sulphur and an effluent that is at least partially free of sulphur,
wherein said first catalyst can be the same or different in each reactor
and is at least one catalyst containing a support comprising at least one
compound selected from the group consisting of alumina, titanium oxide and
zirconia, the support further comprising at least one doping element selected
from the group consisting of iron, cobalt, nickel, copper and vanadium,
each of said reactors further comprises a bed with a catalyst A which
is different from said first catalyst and can be the same or different in each
reactor, wherein in each reactor said first catalyst is disposed upstream of
catalyst A and acts as a protective layer for said catalyst A, and
wherein said feed contains 50-50,000 volume ppm of benzene,
toluene and/or xylenes.
2
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