Appeal No. 1998-0558
Application No. 08/564,942
(1) oxidizing the metal component of
said catalyst in a reactor by circulating a
stream of nitrogen containing about 1
percent by volume of oxygen across said
catalyst while increasing the temperatures
from ambient up to about 480°C;
(2) maintaining the circulating stream
of nitrogen containing about 1 weight
percent oxygen at a temperature of about
480°C until the metal component of said
catalyst is completely oxidized;
(3) stopping the circulating stream
and depressurizing the reactor;
(4) purging the reactor with pure
hydrogen at atmospheric pressure;
(5) circulating pure hydrogen through
the reactor over a range of conditions from
about 340°C and atmospheric pressure to
about 315°C and 12 kg/cm g; and2
(6) stabilizing the catalyst by
injecting ammonia into the reactor;
(c) contacting the feedstock in at least one
isomerization zone with the catalyst and being
effective to promote C alkyl benzene isomerization
8
at isomerization conditions in the presence of
hydrogen at isomerization conditions to isomerize at
least a portion of the C , alkyl aromatic
8
hydrocarbons and to produce an effluent;
(d) separating the effluent to form a hydrogen-rich
fraction, a first hydrocarbon-rich fraction
2
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