Process for maximizing 371.degree.+ production in a...

C - Chemistry – Metallurgy – 10 – G

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C10G 2/00 (2006.01) C07C 1/04 (2006.01)

Patent

CA 2467520

A hydrocarbon synthesis (HCS) process wherein a Fisher-Tropsch reactor is operated to maximize the selectivity to 371~C+ boiling fraction while minimizing the production of less valuable products such as light gases (C1- C4), naphtha and diesel fractions. Inventive modes of operation to offset the effects of catalyst deactivation and maximize selectivity to 371~C+ boiling fraction are utilized including (a) reducing gas inlet velocity to maintain an optimal CO conversion level, (b) introducing additional active catalyst until a maximum loading is reached, and (c) increasing reactor temperature until productivity reaches a predetermined cut-off level.

L'invention concerne un procédé de synthèse d'hydrocarbures (HCS) dans lequel un réacteur Fisher-Tropsch est mis en oeuvre pour maximiser la sélectivité d'une fraction d'ébullition à 371 ·C+, tout en minimisant la production de produits de moindre valeur, tels que des gaz légers (C¿1?-C¿4?), du naphte et des fractions diesel. L'invention concerne des modes de fonctionnement permettant de décaler les effets d'une désactivation d'un catalyseur et de maximiser la sélectivité d'une fraction d'ébullition à 371 ·C+ ; on peut citer parmi de tels modes : (a) réduction de la vitesse d'admission de gaz permettant de conserver un niveau de conversion optimal de CO, (b) introduction d'un catalyseur actif supplémentaire jusqu'à l'obtention du chargement maximal et (c) augmentation de la température du réacteur jusqu'à ce que la productivité atteigne un seuil d'inclusion prédéterminé.

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