Abstract:
Deactivation of a zeolite catalyst during its use to catalyse the oligomerisation of olefins, is often believed to be a result of the formation of high boiling polymers as by-products. These by-products can remain on the catalyst and undergo further conversion to higher molecular weight polymers, which resemble heavy tars and in some cases even have the appearance of coke-like material. These materials can coat the catalyst particles and plug pores in the catalyst, thereby causing catalyst deactivation. The invention relates to an improved method for regenerating such a catalyst.
Abstract:
Systems and methods for regenerating a spent catalyst are provided. The method can include mixing a spent catalyst with a carrier fluid to provide a mixture. The spent catalyst can include carbon deposited on at least a portion thereof. The carrier fluid can include an oxygen containing gas. The mixture can be introduced to or above an upper surface of a dense phase catalyst zone disposed within a regenerator. A gas can be introduced to a lower zone of the dense phase catalyst zone. At least a portion of the carbon deposited on the catalyst can be combusted to provide a flue gas, heat, and a regenerated catalyst.
Abstract:
This invention provides processes for transporting catalyst, preferably in an oxygenate to olefins reaction system. In one embodiment, an oxygenate contacts molecular sieve catalyst particles in a reactor under conditions effective to form an effluent stream comprising light olefins and forming coked catalyst particles. At least a portion of the coked catalyst particles are transported from the reactor or a device associated therewith to a catalyst regenerator through a conduit in a fluidized manner with a fluidizing medium comprising air and steam. At least a portion of the coked catalyst particles are regenerated in the catalyst regenerator to form regenerated catalyst particles, which are ultimately directed back to the reactor.
Abstract:
Process for cracking a paraffinic hydrocarbon feed which process comprises (a) contacting the feed with cracking catalyst at elevated temperature, (b) separating the mixture obtained in step (a) to obtain spent catalyst and hydrocarbon product, (c) contacting the separated catalyst with an oxygen-containing gas to obtain regenerated catalyst, and (d) using at least part of the regenerated catalyst as cracking catalyst in step (a), in which process the oxygen-contaning gas comprises at most 30 %vol of nitrogen and of from 22 to 32 %vol of oxygen.
Abstract:
L'invention concerne un procédé de production de phénylalcanes par alkylation catalytique sur un catalyseur acide solide faisant appel à au moins un réacteur en lit mobile. Ce procédé comprend une étape d'alkylation catalytique d'un composé aromatique par au moins une oléfine ayant de 9 à 16 atomes de carbone par molécule, associée à un circuit de réactivation du catalyseur. Chaque réacteur contient n zones réactionnelles, chacune des dites zones étant constituée d'un catalyseur solide acide, éventuellement différent d'une zone à l'autre. A l'entrée de chaque zone réactionnelle, une fraction de la quantité totale d'oléfines nécessaire à la réaction d'alkylation est introduite. Les phénylalcanes obtenus par le procédé selon l'invention sont particulièrement appropriés pour la fabrication de détergents.
Abstract:
This invention is directed to a method and apparatus for regenerating a catalyst used in an FCC unit, including providing a spent catalyst into an upper portion of a regenerator, maintaining a calcination phase, a gasification phase, and a combustion phase of fluidized catalyst in the regenerator, combusting carbon in the combustion phase and producing a combustion flue gas, reacting carbon in the gasification phase with the combustion flue gas to form a carbon monoxide rich flue gas, and calcining the spent catalyst with the carbon monoxide rich flue gas.
Abstract:
A process for the production of phenyl alkanes by catalytic alkylation on a solid acid catalyst employs at least one moving-bed reactor. This process comprises a catalytic alkylation stage of an aromatic compound by at least one olefin that has 9 to 16 carbon atoms per molecule, combined with a catalyst reactivation circuit. Each reactor contains n reaction zones, whereby each of said zones consists of an acidic solid catalyst, optionally different from one zone to the next. Entering each reaction zone, a fraction of the total amount of olefins necessary to the alkylation reaction is introduced. The phenyl alkanes that are obtained by the process according to the invention are particularly suitable for the production of detergents.