Appeal No. 1998-1067
Application No. 08/273,933
The subject matter on appeal relates to a process for the
production of a benzene, toluene and xylene containing product
which contains a reduced amount of close-boiling non-
aromatics. The process includes the step of contacting a
toluene containing feed which includes about 0.2 wt.% to about
5 wt.% close-boiling non-aromatics in a disproportionation
zone with an acidic para-selective molecular sieve catalyst
under conditions such that the product contains a reduced
amount of close-boiling non-aromatics compared to the feed and
such that at least 40% of the xylene produced is para-xylene.
Further details of this appealed subject matter are set forth
in representative independent claim 31 which reads as follows:
31. A process for the production of a benzene, toluene
and xylene containing product which contains a reduced amount
of close-boiling non-aromatics, comprising:
(a) aromatizing a predominantly paraffinic feedstock
in an aromatization zone over a substantially
nonacidic aromatization catalyst comprising a Group
VIII metal on a molecular sieve support to produce
an aromatization product which comprises a toluene
containing feed which comprises at least about 70%
toluene and from at least about 0.2 wt% to about 5
wt% close-boiling non-aromatics;
(b) contacting the toluene containing feed in a
disproportionation zone with an acidic para-
selective molecular sieve catalyst under conditions
such that the product contains a reduced amount of
close-boiling non-aromatic compared to the feed and
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