Appeal No. 1998-2622
Application No. 08/530,684
thiophenes (col. 2, ll. 63-65). According to appellants, a2
recently discovered alkylation catalyst mixture contains a
hydrogen halide component in a sulfone diluent. After use of
this catalyst mixture in the alkylation of olefins by
isoparaffins, the alkylate product contains a concentration of
sulfone which is undesirable and must be removed because of
the use of the alkylate as a gasoline blending material
(specification, pages 1-2). On this record, the examiner has
not shown, by convincing reasoning or evidence, that sulfones
would have been present in the liquid hydrocarbon feedstock of
Siskin. Siskin discloses a process for refining sulfur,
oxygen and nitrogen contaminated hydrocarbon feedstocks (col.
1, ll. 6-8). Siskin discloses that sulfur compounds are
present as impurities in the hydrocarbon feedstocks and must
be removed since these impurities tend to poison or deactivate
the acidic catalysts used in subsequent reactions such as
reforming, alkylation, isomerization and the like (col. 1, ll.
19-29). Therefore, on this record, the examiner has failed to
2All of these classes of compounds disclosed by Siskin
contain sulfur only attached to carbon or hydrogen, i.e., they
do not contain the -SO - functional group.
2
6
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