Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By condensation of entire molecules or entire hydrocarbyl...
Reexamination Certificate
2011-03-08
2011-03-08
Wood, Elizabeth D (Department: 1732)
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By condensation of entire molecules or entire hydrocarbyl...
C585S454000, C585S467000, C585S469000, C585S448000, C585S470000, C585S471000, C585S805000
Reexamination Certificate
active
07902414
ABSTRACT:
A catalytic process for the selective production of para-xylene comprises the step of reacting an aromatic hydrocarbon selected from the group consisting of toluene, benzene and mixtures thereof with a feed comprising carbon monoxide and hydrogen in the presence of a selectivated catalyst. The process includes a catalyst selectivation phase and a para-xylene production phase. In the catalyst selectivation phase, the aromatic hydrocarbon and the feed are contacted with the catalyst under a first set of conditions effective to increase the para-selectivity of said catalyst. In the para-xylene production phase, the aromatic hydrocarbon and said feed are contacted with the catalyst under a second set of conditions different from the first set of conditions effective to selectively produce para-xylene.
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Hong Zongxuan
McMinn Timothy E.
Ou John D. Y.
Tan Songsheng
ExxonMobil Chemical Patents Inc.
Griffis Andrew B.
Wood Elizabeth D
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