Method for reducing gasoline sulfur in fluid catalytic cracking

C - Chemistry – Metallurgy – 10 – G

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C10G 11/18 (2006.01) C10G 11/05 (2006.01) C01B 39/00 (2006.01)

Patent

CA 2384030

The sulfur content of liquid cracking products, especially the cracked gasoline, of a catalytic cracking process is reduced by the use of a catalyst having a product sulfur reduction component containing a metal component in an oxidation state greater than zero, wherein the average oxidation state of the metal component is increased by an oxidation step following conventional catalyst regeneration. The catalyst is normally a molecular sieve such as a zeolite Y, REY, USY, REUSY, Beta or ZSM-5. The metal component is normally a metal of Groups 5, 7, 8, 9, 12 or 13 of the periodic table, preferably vanadium or zinc. The sulfur reduction component may be a separate particle additive or part of an integrated cracking/sulfur reduction catalyst. A system for increasing the oxidation state of the metal component of a Gasoline Sulfur Reduction additive is also provided.

Dans cette invention, on réduit la teneur en souffre des produits de craquage liquide, particulièrement l'essence de craquage, d'un procédé de craquage catalytique au moyen d'un catalyseur présentant un composant de réduction de soufre produit qui renferme un composant métallique dans un état d'oxydation supérieur à zéro, l'état d'oxydation moyen du composant métallique étant augmenté par l'opération d'oxydation qui suit la régénération de catalyseur classique. Ce catalyseur consiste normalement en un tamis moléculaire comme le zéolite Y, REY, USY, REUSY, Bêta ou ZSM-5. Le composant métallique consiste normalement en un métal des groupes 5, 7, 8, 9, 12 ou 13 du tableau périodique, de préférence du vanadium ou du zinc. Le composant de réduction de soufre peut être un additif particulaire séparé ou une partie d'un catalyseur de réduction de soufre/craquage intégré. En outre, cette invention concerne un système permettant d'augmenter l'état d'oxydation du composant métallique d'un additif réducteur de soufre dans l'essence.

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