Catalytic reforming process

Details Catalytic reforming process Catalytic reforming process

1983-04-06

1984-01-10

Davis, Curtis R.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208 64, 208138, 208139, C10G 3506

Patent

active

044252226

ABSTRACT:
A process wherein, in a series of reforming zones, or onstream reactors, each of which contains a bed, or beds of catalyst, the catalyst in the leading reforming zones is constituted of supported platinum and a relatively low concentration of rhenium, and the catalyst in the last reforming zone, or reactor of the series, is constituted of platinum and a relatively high concentration of rhenium, and a swing reactor, also containing a supported platinum and rhenium catalyst, is manifolded so that it can be substituted for any one of the onstream reactors of the unit. The entry side, or upper portion of the swing reactor contains a catalyst constituted of platinum and a relatively low concentration of rhenium, and the exit side, or lower portion of the reactor contains a catalyst constituted of platinum and a relatively high concentration of rhenium. The amount of rhenium relative to the platinum on the catalyst in the last reactor and lower portion of the swing reactor is present in a weight ratio of rhenium:platinum of at least 1.5:1; preferably at least about 2:1, and more preferably ranges from about 2:1 to about 3:1. The amount of rhenium relative to the platinum on the catalyst in the lead reactors and upper portion of the swing reactor is present in a weight ratio of rhenium:platinum of up to about 1.2:1. The beds of catalyst in the several reactors are serially contacted with a hydrocarbon or naphtha feed, and hydrogen, at reforming conditions the feed flowing from one reactor of the series to the next, and serially through the upper and lower beds of the swing reactor, to produce a hydrocarbon, or naphtha product of improved octane, and the product is withdrawn.

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