Integrated staged catalytic cracking and hydroprocessing...

Details Integrated staged catalytic cracking and hydroprocessing... Integrated staged catalytic cracking and hydroprocessing...

C - Chemistry, Metallurgy

10

G

C10G 69/04 (2006.01) C10G 69/00 (2006.01)

Patent

CA 2212568

Disclosed is a catalytic cracking process which includes more than one catalytic cracking reaction step. The process integrates a hydroprocessing process step between the catalytic cracking reaction steps in order to maximize olefins production, mid-distillate quality and naphtha octane level in the cracked products. Preferably, a first cracked hydrocarbon product is obtained from a first cracking stage and separated into a mid-distillate and gas oil containing fraction having an initial boiling point of at least 300°F, the distillate and gas oil containing fraction is hydroprocessed, and a naphtha fraction and a gas oil containing bottoms fraction of the hydroprocessed material are cracked in a second cracking stage.

Procédé de craquage catalytique comprenant plus d'une étape de craquage catalytique. Le procédé comporte une étape d'hydrotraitement entre les étapes de craquage catalytique de façon à maximiser la production d'oléfines, la qualité du distillat moyen et l'indice d'octane des naphtes dans les produits de craquage. Selon une version privilégiée, un premier produit hydrocarboné de craquage est obtenu dans une première étape de craquage et séparé en distillat moyen et en fraction contenant du gas-oil, avec un point d'ébullition initial d'au moins 300 degrés F; la fraction renfermant le distillat et le gas-oil est soumise à un hydrotraitement; une fraction de naphtes et une fraction de résidus contenant le gas oil des produits hydrotraités passent par une seconde étape de craquage.

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