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US 2009/0152167 A1Published application
FCC Process with Spent Catalyst Recycle
AssigneeUop LLC
InventorMichael S. Sandacz
Life of this patent
Estimating the term…
Abstract
Disclosed is an FCC apparatus and process in which spent catalyst is recycled to the base of the riser to contact fresh feed through a passage disposed within the riser.
Claims21
An FCC reactor comprising:
- a riser having an outer wall;
- an inner riser within said outer wall in downstream communication with a feed distributor for injecting feed into said inner riser, said inner riser having an entrance in downstream communication with a regenerated catalyst conduit and an inner riser outlet for discharging catalyst and cracked feed;
- a passage within said outer wall in downstream communication with said riser outlet, said passage having a passage outlet in upstream communication with said entrance.
An FCC reactor comprising:
- an elongated riser including an inner riser in which a hydrocarbon feed is contacted with catalyst particles to produce a gaseous product and spent catalyst particles;
- a disengaging chamber in downstream communication with an outlet of said riser;
- a cyclone in downstream communication with said outlet for further separating said catalyst particles from said gaseous product;
- and
- a passage within said riser for conveying spent catalyst particles to a base of the riser.
2 more elements
A process for fluidized catalytic cracking of a hydrocarbon feed stream to products, the process comprising:
- blending spent catalyst and regenerated catalyst;
- contacting said hydrocarbon feed stream with said blended catalyst within an outer wall of a riser to produce said products and spent catalyst;
- regenerating a first portion of said spent catalyst to provide said regenerated catalyst;
- recycling a second portion of said spent catalyst through a passage disposed within said outer wall of said riser.
1 more element
Dependencies are inferred from the claim text.