Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By alkyl or aryl transfer between molecules – e.g.,...
Patent
1989-01-04
1990-09-11
Myers, Helane
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By alkyl or aryl transfer between molecules, e.g.,...
585470, 585474, C10C 362
Patent
active
049565117
ABSTRACT:
Process for the disproportionation of toluene over a nickel modified mordenite catalyst in which catalyst activity and aging quality are enhanced for carrying out the disproportionation reaction under relatively low temperature conditions with small increases of temperature as the process continues. The catalyst is loaded into a catalytic reaction zone. A preflush gas such as hydrogen is passed into the reaction zone while withdrawing the gas from the reaction zone and progressively increasing the temperature of the reaction zone to a desired level. A toluene feedstock is then passed into the reaction zone. Hydrogen is supplied with the toluene to the reaction zone, normally at a hydrogen/toluene mole ratio of 4 or less. At the conclusion of the initial transient conditions accompanying the initiation of toluene feed to the reaction zone, initial steady state conditions for disproportionation of toluene to benzene and xylene in the presence of the catalyst are established. The initial toluene conversion rate is at least 40% with an initial steady state reactor temperature (as measured at the reactor inlet) within the range of 600.degree.-800.degree. F., and a temperature gradient across the reactor of no more than 50.degree. F. The process is continued at a toluene conversion rate of at least 40% while retaining the activity of the catalyst, as indicated by toluene conversion, at an average progressive incremental temperature increase of no more than 7.degree. F. per week, as normalized by changes in space velocity of the toluene feedstock over the catalyst bed.
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Butler James R.
Curtis J. Randall
Abokhair John K.
Fina Technology, Inc.
Jackson William D.
Myers Helane
Wheelington Jimmy D.
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