Fluid cat cracking with high olefins production

Details Fluid cat cracking with high olefins production Fluid cat cracking with high olefins production

C - Chemistry, Metallurgy

10

G

C10G 9/00 (2006.01) C10G 11/00 (2006.01) C10G 11/02 (2006.01) C10G 11/18 (2006.01) C10G 51/02 (2006.01)

Patent

CA 2351382

The propylene production of a fluid catalytic cracking unit (10) employing a large pore zeolite cracking catalyst, produces more propylene by adding a naphtha cracking riser (12) and a medium pore zeolite catalytic component to the unit (10), and recycling at least a portion of the naphtha crackate to the naphtha riser (12). The large pore size zeolite preferably comprises a USY zeolite and the medium pore size is preferably ZSM-5. Propylene production per unit of naphtha feed to the naphtha riser (12) is maximized, by using the 60- 300 ~F naphtha crackate as the feed.

Cette invention concerne une unité catalytique liquide (10) faisant intervenir un catalyseur de craquage à zéolite à larges pores. Pour augmenter la production de propylène, on ajoute à l'unité (10) un dispositif élévateur de craquage de naphte (12) et un composant catalytique à zéolite à pores moyens et l'on recycle une partie au moins du craquat de naphte via le dispositif élévateur de craquage. Le zéolite à larges pores est de préférence un zéolite Y ultrastable (USY) et le zéolite à pores moyen de préférence un zéolite ZSM-5. La production de propylène par unité de charge de napthe au dispositif élévateur (12) Pour maximiser la production de propylène, on alimente le dispositif élévateur de naphte (12) avec un craquât de naphte à 60-300 ·C.

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