Texaco Inc.

John A Lemen

David E Sherwood, Jr

Bobby R Martin

Leonard A Matthews

Billy R Allen

Johnnie R Hardee, Jr

A continuous process has been found for producing hydroxyacylated alkenyl-substituted mono- and bis- succinimides. The Mannich phenol coupled compositions are produced continuously as well. In the imidization reaction, an alkenyl succinic anhydride is contacted with a polyamine to form mono- and bis- polyamino alkenyl succinimides in continuous stirred tank reactor for a residence time of 1 to 3 hours. The reaction product is then, optionally Mannich base coupled. Finally, in the amidization, the mono- and bis- polyamino alkenyl succinimide is contacted with an acylating agent such as hydroxyacetic acid. Contacting is carried out in a continuous stirred tank reactor for a residence time of 3 to 6 hours. A hydroxyacylated alkenyl-substituted mono- and bis- succinimide product free of haze is produced in the absence of filtering, by reducing water continuously in all three reactors to a concentration of 0.4 wt %.

Continuous process for alkenyl succinimides

Spent hydrotreating catalyst having carbonaceous and metallic deposits and of regular geometric shape after being stripped of process oil is fluidized by flowing air upwardly through the catalyst at a velocity sufficient to expand the bed thereby segregating the catalyst particles into a high activity, upper, less-contaminated fraction and a lower, more-contaminated fraction and recycling the high activity fraction to a hydrotreating process. Optionally, the high activity fraction can be regenerated with carbon burnoff or rejuvenated by acid leaching followed by regeneration with carbon burnoff to further improve catalyst activity.

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Port Arthur, TX, United States of America

John A Lemen