Regeneration of dehydrocyclodimerization catalyst

Details Regeneration of dehydrocyclodimerization catalyst Regeneration of dehydrocyclodimerization catalyst

1987-12-28

1989-01-03

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By ring formation from nonring moiety, e.g., aromatization,...

502 38, C07C 1202

Patent

active

047958456

ABSTRACT:
A process for catalytic dehydrocyclodimerization and regeneration of the catalyst. C.sub.2 to C.sub.5 aliphatic hydrocarbons are reacted to produce aromatics, using a catalyst of a composition especially adapted to minimize deposition of coke on the catalyst. The catalyst is comprised of alumina which contains phosphorus, gallium, and a crystalline aluminosilicate having a silica to alumina ratio of at least 12. The use of this catalyst has resulted in a five-fold reduction in the rate of coke deposition, compared to a conventional dehydrocyclodimerization catalyst. However, the activity of this catalyst once it becomes deactivated is only recovered by burning the coke accumulated upon the deactivated catalyst at catalyst regeneration conditions in the presence of an oxygen-containing gas.

REFERENCES:
patent: 4480144 (1984-10-01), Smith
patent: 4654455 (1987-03-01), Chao

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