Multiple-stage hydrocarbon conversion with gravity-flowing catal

Details Multiple-stage hydrocarbon conversion with gravity-flowing catal Multiple-stage hydrocarbon conversion with gravity-flowing catal

1977-05-09

1978-10-10

Levine, Herbert

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208165, 206169, 422191, 422213, C10G 3512

Patent

active

041195264

ABSTRACT:
A multiple-stage catalytic conversion system in which a hydrocarbonaceous charge stock and hydrogen flow serially through a plurality of catalytic reaction zones in each of which the catalyst particles are downwardly movable via gravity-flow. The flow of the product effluent from at least one reaction zone is restricted, as is the flow of the hydrogen-rich vaporous phase separated from the effluent from the last reaction zone and recycled to the first reaction zone. This technique increases the density of the reaction zone feed and the pressure drop within the entire reactor circuit, and thus serves to alleviate the problems associated with the occurrence of stagnant catalyst areas as a result of catalyst particles being "pinned" within the reaction zone and thus unable to assume a downward, gravity-flow pattern. Flow restriction may be effected either before, or after the inter-reaction zone heaters, preferably the former.

REFERENCES:
patent: 2893945 (1959-07-01), Berg
patent: 2914466 (1959-11-01), Lieffers et al.
patent: 3647680 (1972-03-01), Greenwood et al.

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