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AssigneeTotal Raffinage France
InventorsMarc Bories, Patrick Leroy
Estimating the term…
Process for the fluidized-bed catalytic cracking of a weakly coking feedstock having a Conradson carbon residue equal to or less than 0.1% by weight and a hydrogen content equal to or greater than 12.7% by weight, comprising at least a step of cracking the feedstock, a step of separating/stripping the effluents from the coked catalyst particles and a step of regenerating said particles, the process being characterized in that at least one coking, carbonaceous and/or hydrocarbonaceous effluent having a content of aromatic compounds of greater than 50% by weight, comprising more than 20% by weight of polyaromatic compounds, is recycled to homogeneously distributed and weakly coked catalyst, before regeneration, in order to adjust the delta coke of the process.
Plant for implementing a process for fluidized bed catalytic cracking, comprising at least a main reactor and optionally at least a secondary reactor, at least a disengager and a stripper, and a single-stage or multistage regenerator, characterized in that the stripper contains, level with a dense catalyst bed, at least one zone equipped with at least one structured packing element positioned upstream of a device for dispersing a coking fraction with respect to circulation of a stream of catalyst particles, wherein said structured packing element(s) are formed by interlacing plates, strips or fins constituting a screen, said screen occupying less than 10% of the area of flow cross section in a vessel in which it is placed, but covering, in projection on said section, the entire area thereof.
Dependencies are inferred from the claim text.