Lummus Crest, Inc.

Abb Lummus Crest, Inc.

Robert J Feldman

Roger P Van Driesen

Andrei Rhoe

Vincent A Strangio

Joseph F Puzio

Donald P Satchell, Jr

James M Chen

William A Schwartz

Theodore S Williams

C Bertil Fogman

Joseph M Dufallo

In a dehydrogenation process wherein catalyst is regenerated off-stream by use of heated air, at least two reactors are in the regeneration cycle, with regeneration air being heated to regeneration catalyst temperature for introduction into the first reactor, and thereafter being reheated to catalyst regeneration temperature and introduced into the second reactor. Such air may also be employed for preheating feed to the dehydrogenation reactor and/or for steam generation by heating such air to the temperature required for such procedure.

Catalyst regeneration in a dehydrogenation process

The severity of a visbreaking operation is increased by treating product to remove a heavier phase in an amount of less than 15 weight percent and recycling treated product.

High severity visbreaking with recycle

The severity of a visbreaking operation is increased by treating product to remove a heavier phase in an amount of less than 15 weight percent and provide a remaining product having a Shell Hot Filtration number of less than 0.25.

High severity visbreaking

Prior to upgrading a viscous feed by visbreaking, at least a portion of the feed is treated to remove a heavy phase in specified amounts, whereby the severity of the visbreaking may be increased. The Shell Hot Filtration number of the visbreaking product is reduced by at least 75%, compared to visbreaking of untreated feed at some severity.

Treatment of feed for high severity visbreaking

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Passaic, NJ, United States of America

Robert J Feldman