Process for selectively producing propylene in a fluid...

Details Process for selectively producing propylene in a fluid... Process for selectively producing propylene in a fluid...

C - Chemistry, Metallurgy

10

G

C10G 11/05 (2006.01) C10G 11/18 (2006.01) C10G 51/02 (2006.01)

Patent

CA 2380059

A process for producing polypropylene from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from 10 to 50 wt.% of a crystalline zeolite having an average pore diameter less than 0.7 nanometers at reaction conditions which include temperatures from 500 ~C to 650 ~C and a hydrocarbon partial pressure from 10 to 40 psia. The catalyst may be pre-coked with a carbonaceous feed. Alternatively, the carbonaceous feed used to coke the catalyst may be co-fed with the naphtha feed.

L'invention concerne un procédé de production de polypropylène à partir d'oléfines produites sélectivement à partir d'un flux de naphta soumis à un craquage catalytique ou thermique. Ce flux de naphta est mis en contact avec un catalyseur renfermant entre 10 et 50 % en poids d'une zéolite cristalline présentant un diamètre de pore moyen inférieur à 0,7 nanomètres dans des conditions de réaction comprenant des températures allant de 500 ·C à 650 ·C et une pression partielle de l'hydrocarbure comprise entre 10 et 40 psia. Le catalyseur peut être pré-coké avec un flux carboné. Le flux carboné utilisé pour le cokage du catalyseur peut éventuellement être alimenté conjointement avec le flux de naphta.

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