Regeneration of a catalyst for aromatic hydrocarbons steam dealk

Details Regeneration of a catalyst for aromatic hydrocarbons steam dealk Regeneration of a catalyst for aromatic hydrocarbons steam dealk

1979-11-29

1981-07-07

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

208124, 585487, B01J 2120, B01J 2396, C07C 418

Patent

active

042773695

ABSTRACT:
A catalyst for the steam dealkylation of aromatic hydrocarbons, comprising a carrier and 3 metals, is regenerated in the reaction zone containing the catalyst bed, after disconnection of said zone from the producing unit, by proceeding to the successive steps of: scavenging said zone with hydrogen and then with an inert gas, progressively replacing said inert gas by a gas containing molecular oxygen, burning the catalyst at a temperature lower than 650.degree. C. so as to calcine the carbon deposits of the catalyst, passing through the catalyst bed an air stream containing halogen to increase the halogen content of the catalyst, calcining by means of an air stream at a temperature of 300.degree.-600.degree. C. and purging with an inert gas before reconnecting said reaction zone to the producing unit.

REFERENCES:
patent: 3673109 (1972-06-01), Georgescv et al.
patent: 4133743 (1979-01-01), Boret et al.
patent: 4148749 (1979-04-01), Ab der Halden et al.
patent: 4199437 (1980-04-01), Courty et al.

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