Reduced holdup in catalytic reactor

C - Chemistry – Metallurgy – 10 – G

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C10G 45/18 (2006.01) C10G 45/20 (2006.01)

Patent

CA 2041538

A reactor for refining resid includes an elongated vertical vessel containing a bed of catalyst which is expanded or ebullated by a liquid/gas mixture. The mixture rises in an updraft through the bed and then is recirculated with an increased velocity by an ebullating pump. To reduce gas holdup of the ebullated bed and to promote a more uniform flow, the gas is entrapped by two cascaded stages of baffles which have an internal conical shape to guide, direct, and entrap the gas. One of these two stages has a shape which creates a countercurrent in the flowing liquid to deflect any catalyst particles which might otherwise be elutriated by the increased velocity.

Un réacteur pour raffiner les résidus de distillation se caractérise par un récipient vertical de forme allongée contenant un lit de catalyseur qui est expansé ou mis en suspension par un mélange liquide/gaz. Le mélange s'élève dans un courant ascendant à travers le lit, puis est remis en circulation à une vitesse supérieure par une pompe de mise en suspension. Pour réduire la rétention du gaz du lit en suspension et pour favoriser un écoulement plus uniforme, le gaz est piégé par deux étages de chicanes en cascade qui ont une forme interne conique pour guider, diriger et piéger le gaz. Un de ces deux étages a une forme qui crée un contre-courant dans le liquide en écoulement pour faire dévier toutes les particules de catalyseur qui autrement pourraient faire l'objet d'une élutriation par la vitesse accrue.

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