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US 8,864,979 B2Granted
Process and apparatus for fluid catalytic cracking
AssigneeUop LLC
InventorPaolo Palmas
Life of this patent
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Abstract
One exemplary embodiment can be a process for fluid catalytic cracking. The process can include sending a first catalyst from a first riser reactor and a second catalyst from a second riser reactor to a regeneration vessel having a first stage and a second stage. The first catalyst may be sent to the first stage and the second catalyst may be sent to the second stage of the regeneration vessel. Generally, the first stage is positioned above the second stage.
Claims8
A process for fluid catalytic cracking, comprising:
- A) sending a first catalyst from a first riser reactor to a regeneration vessel having a first stage and a second stage, wherein the first stage is positioned above the second stage;
- B) sending a second catalyst from a second riser reactor to the regeneration vessel, wherein the first catalyst is sent to the first stage and the second catalyst is sent to the second stage of the regeneration vessel;
- C) wherein a first line communicates the first catalyst from the first riser reactor to the regeneration vessel, a second line communicates the first catalyst to the first riser reactor from the regeneration vessel, a third line communicates the second catalyst from the second riser reactor to the regeneration vessel, and a fourth line communicates the second catalyst to the second riser reactor from the regeneration vessel;
- D) wherein the first line contains a first valve, the second line contains a second valve, the third line contains a third valve, and the fourth line contains a fourth valve;
- and
- E) wherein a standard deviation of the pressure differentials across all four valves is no more than about 20 kPa.
3 more elements
A process for fluid catalytic cracking, comprising:
- A) sending a spent first catalyst through a first line from a first riser reactor to a regeneration vessel and a regenerated first catalyst through a second line from the regeneration vessel to the first riser reactor;
- B) sending a spent second catalyst through a third line from a second riser reactor to the regeneration vessel, and a regenerated second catalyst through a fourth line from the regeneration vessel to the second riser reactor, wherein the regeneration vessel has a first stage above a second stage with the spent first catalyst being provided to the first stage and the spent second catalyst being provided to the second stage;
- C) wherein each of the first, second, third, and fourth lines contains a respective first, second, third, and fourth valve;
- and
- D) wherein a standard deviation of the pressure differentials across all four valves is less than about 20 kPa.
2 more elements
Dependencies are inferred from the claim text.