Operating method for fluid catalytic cracking

Details Operating method for fluid catalytic cracking Operating method for fluid catalytic cracking

C - Chemistry, Metallurgy

10

G

C10G 11/18 (2006.01)

Patent

CA 2328978

The present invention is directed to a Fluid Catalytic Cracking process conducted under fluid catalytic cracking conditions by injecting into at least one reaction zone of a fluid catalytic cracking unit (FCCU) having one or more risers, 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 feeds (.alpha.) and (.beta.) are alternately injected and wherein said alternate injection maintains said risers in a cyclic steady state, while the rest of the FCC unit is in a steady state.

La présente invention concerne un procédé de craquage catalytique fluide, conduit dans des conditions de craquage catalytique fluidique, par injection, dans au moins une zone de réaction d'une unité de craquage catalytique fluide pourvue d'un ou plusieurs élévateurs de catalyseur, d'une pluralité de charges, ladite pluralité de charges comprenant au moins une charge (.alpha.) et au moins une autre charge (.beta.). Ces charges (.alpha.) et (.beta.) (a) diffèrent en résidu Conradson d'au moins 2 % en poids environ; ou (b) diffèrent en teneur en hydrogène d'au moins 0,2 % en poids environ ; ou (c) diffèrent en densité API d'au moins 2 points environ, ou (d) diffèrent en teneur en azote d'au moins 50 ppm ; ou (e) diffèrent en rapport carbone/hydrogène d'au moins 0,3 environ ; ou (f) diffèrent en point d'ébullition moyen d'au moins 200 ·F environ ; et lesquelles charges (.alpha.) et (.beta.) sont injectées en alternance, injection alternée qui permet de maintenir les élévateurs dans un état cyclique stable, lorsque le reste de l'unité de craquage catalytique fluide est dans un état stable.

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