Process for zeolite catalyst reactivation

B - Operations – Transporting – 01 – J

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B01J 38/56 (2006.01) B01J 29/90 (2006.01) B01J 38/60 (2006.01)

Patent

CA 2272274

A spent zeolite-containing hydrocarbon cracking catalyst is treated by regenerating it to remove carbonaceous deposits. A portion of the regenerated catalyst is withdrawn from the circulating catalyst inventory of a hydrocarbon processing unit and slurried with a liquid containing an activating agent to solubilize and/or dislodge contaminants which block the pores of the zeolite and adversely affect the activity of the catalyst. The slurry is agitated to dissolve or dislodge the contaminants from the zeolite pores, and the agitated slurry, without being permitted to settle, is transferred to a fluidized drying zone where the liquid and solubilized and/or dislodged contaminants are removed from the treated catalyst which has a level of cracking activity higher than that of the catalyst in the circulating catalyst inventory. The treated catalyst is then recycled to the unit and contacted with a hydrocarbon feedstock under cracking conditions.

Selon la présente invention, on régénère un catalyseur usé contenant un zéolite destiné au craquage des hydrocarbures afin d'en éliminer les dépôts carbonés. On extrait une partie du catalyseur régénéré du stock de catalyseur en circulation d'une unité de traitement d'hydrocarbures et on la mélange à un liquide contenant un activateur afin de solubiliser et/ou détacher les impuretés qui, en bloquant les pores du zéolite, entravent l'activité du catalyseur. On agite le mélange afin de dissoudre ou de détacher les impuretés des pores du zéolite et on transfère le mélange qui a été agité, sans lui laisser le temps de décanter, dans une zone de déshydratation à lit fluidisé où le liquide et les impuretés solubilisées et/ou détachées sont éliminés du catalyseur traité, ledit catalyseur traité présentant un niveau d'activité de craquage plus élevé que celui du stock de catalyseur en circulation. Le catalyseur traité est alors remis en circulation dans l'unité et il est mis en contact avec une charge de départ hydrocarbonée dans des conditions de craquage.

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