Fluid catalytic cracking process for converting a plurality...

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 11/18 (2006.01)

Patent

CA 2328088

The invention is directed to a Fluid Catalytic Cracking process conducted in a fluid catalytic cracking unit (FCCU) comprising one or more risers, each of said risers having a plurality of injection nozzles therein and at least one reaction zone therein comprising the steps of spatially nonuniformly injecting a plurality of feeds wherein said plurality of feeds comprises at least one feed (.alpha.) and at least another feed (.beta.), wherein said feeds (.alpha.) and (.beta.): (a) differ in Conradson Carbon Residue by at least about 2 wt.% points or (b) differ in hydrogen content by at least about 0.2 wt.%; or (c) differ in API gravities by at least about 2 points; or (d) differ in nitrogen content by at least about 50 ppm; or (e) differ in carbon-to- hydrogen ratio by at least about 0.3; or (f) differ in mean boiling point by at least about 200 ~F; and wherein said spatially nonuniform injection is accomplished by (i) simultaneously injecting into a single reaction zone of a single riser said feed (.alpha.) from at least one injection nozzle of said riser and said feed (.beta.) from the remaining nozzles of said riser; (ii) simultaneously injecting said feed (.alpha.) into at least one of said reaction zones of said riser of said FCCU and said feed (.beta.) into another of said reaction zones of said riser of said FCCU; or (iii) simultaneously injecting said feed (.alpha.) into at least one riser of said FCCU and said feed (.beta.) into a second riser of said FCCU. Wherein when said spatially nonuniform injection is accomplished by (iii), said feeds are substantially non-paraffinic feeds.

Cette invention concerne un procédé de craquage catalytique fluide qui se déroule dans une unité de craquage catalytique fluide (UCCF) comprenant une ou plusieurs colonnes montantes. Chaque colonne montante comprend plusieurs buses d'injection et au moins une zone de réaction. Ce procédé consiste à injecter de manière non uniforme et tridimensionnelle plusieurs charges d'alimentation, à savoir au moins une charge (.alpha.) et au moins une autre charge (.beta.). Les deux charges (.alpha.) et (.beta.) se distinguent l'une de l'autre en ce que: (a) soit leurs résidus Conradson diffèrent d'au moins 2 points de % en poids environ; (b) soit leurs teneurs en hydrogène diffèrent d'au moins 0,2 % en poids environ; (c) soit leurs gravités API diffèrent d'au moins 2 points environ; (d) soit leurs teneurs en azote diffèrent d'au moins 50 mg/l environ; (e) soit les rapports carbone-hydrogène diffèrent d'au moins 0,3 environ; ou (f), soit leurs points d'ébullition moyens diffèrent d'au moins 200 ·F environ. L'injection non uniforme tridimensionnelle se fait de la manière suivante: (i) on injecte simultanément, dans une seule zone de réaction d'une seule et même colonne montante, la charge (.alpha.) par au moins une buse d'injection ainsi que la charge (.beta.) par les autres buses de cette colonne; (ii) on injecte la charge (.alpha.) dans au moins une des zones de réaction de la colonne montante de l'UCCF et l'on injecte simultanément la charge (.beta.) dans une autre zone de réaction de ladite colonne montante; ou (iii) on injecte la charge (.alpha.) dans au moins une colonne montante de l'UCCF tandis que l'on injecte simultanément la charge (.beta.) dans une seconde colonne montante de l'UCCF. Lorsque l'injection non uniforme tridimensionnelle se fait selon le procédé décrit en (iii), les charges d'alimentation consistent essentiellement en des charges non paraffiniques.

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