Slurry circulation process and system for fluidized particle contacting
First Claim
1. A process for the production and separation of a fluidized catalytic cracking (FCC) product stream wherein the product stream contains fine catalyst particle, the process comprising:
- a) passing an FCC feedstock and regenerated catalyst particles to a reaction zone to convert said feedstock;
b) separating catalyst particles from gaseous hydrocarbons and recovering an FCC product stream containing fine catalyst particles and passing separated particles to a relatively dense bed;
c) passing the FCC product stream to a fractionation zone and to separating the FCC product stream in the fractionation zone into at least a relatively light hydrocarbon stream and a relatively heavy hydrocarbon stream;
d) recovering a particle recycle stream containing fine catalyst particles and at least a portion of the relatively heavy hydrocarbon stream;
e) concentrating particles in the particle recycle stream to provide a concentrated particle stream having a higher concentration of particles than the particle recycle stream;
f) injecting the concentrated particle stream directly into the relatively dense bed at an injection point;
g) withdrawing a coked catalyst stream comprising at least a portion of the fine particles from the relatively dense bed at a location below the injection point and passing the coked catalyst stream to a regeneration zone; and
,h) combusting coke from catalyst particles in the regeneration zone to generate flue gas that passes out of the regeneration zone carrying entrained fine catalyst particles therewith to supply regenerated catalyst to the reaction zone.
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Accused Products
Abstract
The invention improves a system and apparatus for the recovery of fine solid particles entering the slurry system of a fluidized catalytic contacting process by returning a portion of the recovered solids from the main separator directly back to the reactor stripper. The invention recovers fine particulate material from an FCC main column and returns the particulate material to an FCC stripper to reduce the amount of fine material that continues to recycle through the FCC reactor and product separator. By returning fine particulate material from the FCC product separation zone directly to a low velocity area of the stripping section, the invention breaks the reactor--main column recycle loop that concentrates the fines. Fines entering the reactor stripper will not be carried back into the cyclones for unwanted return to the main column. By the recycling of fines to the stripper via this invention, the fines concentration in the slurry system can decrease by up to 300%.
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Citations
10 Claims
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1. A process for the production and separation of a fluidized catalytic cracking (FCC) product stream wherein the product stream contains fine catalyst particle, the process comprising:
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a) passing an FCC feedstock and regenerated catalyst particles to a reaction zone to convert said feedstock; b) separating catalyst particles from gaseous hydrocarbons and recovering an FCC product stream containing fine catalyst particles and passing separated particles to a relatively dense bed; c) passing the FCC product stream to a fractionation zone and to separating the FCC product stream in the fractionation zone into at least a relatively light hydrocarbon stream and a relatively heavy hydrocarbon stream; d) recovering a particle recycle stream containing fine catalyst particles and at least a portion of the relatively heavy hydrocarbon stream; e) concentrating particles in the particle recycle stream to provide a concentrated particle stream having a higher concentration of particles than the particle recycle stream; f) injecting the concentrated particle stream directly into the relatively dense bed at an injection point; g) withdrawing a coked catalyst stream comprising at least a portion of the fine particles from the relatively dense bed at a location below the injection point and passing the coked catalyst stream to a regeneration zone; and
,h) combusting coke from catalyst particles in the regeneration zone to generate flue gas that passes out of the regeneration zone carrying entrained fine catalyst particles therewith to supply regenerated catalyst to the reaction zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification