Process and apparatus for fluid catalytic cracking

Patent metadata

Field	Value
Publication number	US-9816036-B2
Application number	US-201414465268-A
Country	US
Kind code	B2
Filing date	Aug 21, 2014
Priority date	Mar 21, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

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.

First claim

The invention claimed is:

1. 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; and
C) providing catalyst from said second stage of the regeneration vessel to the first riser reactor and to the second riser reactor.

2. The process according to claim 1 , wherein the first riser reactor operates at a pressure of about 170-about 450 kPa.

3. The process according to claim 1 , wherein the second riser reactor operates at a pressure of about 170-about 450 kPa.

4. The process according to claim 1 , wherein the first and second riser reactors are at about a substantially same pressure.

5. The process according to claim 1 , further comprising a first line communicating the first catalyst from the first riser reactor to the regeneration vessel, a second line communicating the first catalyst to the first riser reactor from the regeneration vessel, a third line communicating the second catalyst from the second riser reactor to the regeneration vessel, and a fourth line communicating the second catalyst to the second riser reactor from the regeneration vessel.

6. The process according to claim 5 , 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.

7. The process according to claim 6 , wherein the standard deviation of the pressure differentials across all four valves is no more than about 20 kPa.

8. The process according to claim 1 , wherein the first stage contains one or more cyclone separators.

9. The process according to claim 1 , wherein the second stage receives regenerated catalyst prior to returning to the first and second reactor risers.

10. The process according to claim 1 , wherein the first riser reactor comprises a first riser and a first reaction vessel, and the second riser reactor comprises a second riser and a second reaction vessel.

11. A fluid catalytic cracking apparatus, comprising:
A) a first riser reactor;
B) a second riser reactor;
C) a regeneration vessel comprising a first stage above a second stage, wherein the first riser reactor communicates spent catalyst to the first stage and the second riser reactor communicates spent catalyst to the second stage; and
D) the second stage of the regeneration vessel communicates catalyst to the first riser reactor and to the second riser reactor.

12. The apparatus according to claim 11 , further comprises a first line communicating spent catalyst from the first riser reactor to the regeneration vessel, a second line communicating regenerated catalyst from the regeneration vessel to the first riser reactor, a third line communicating spent catalyst from the second riser reactor to the regeneration vessel, and a fourth line communicating regenerated catalyst from the regeneration vessel to the second riser reactor.

13. The apparatus according to claim 11 , wherein the first stage of the regeneration vessel contains one or more cyclone separators.

14. The apparatus according to claim 12 , wherein each of the first, second, third, and fourth lines contains a respective valve.

15. The apparatus according to claim 12 , wherein an outlet of the third line is proximate to an inlet of the fourth line.

16. 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) passing catalyst from said first stage of the regeneration vessel to be received in the second stage of the regeneration vessel; and
D) providing catalyst from said second stage of the regeneration vessel to the first riser reactor and to the second riser reactor.

17. The process according to claim 16 , wherein each of the first, second, third, and fourth lines contains a respective first, second, third, and fourth valve.

18. The process according to claim 17 , wherein the standard deviation of the pressure differentials across all four valves is less than about 20 kPa.

Assignees

• Uop Llc

Inventors

• Palmas Paolo

Classifications

• C10G11/00

  Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils (cracking in direct contact with molten metals or salts C10G9/34) · CPC title

• B01J38/06

  using steam · CPC title

• B01J8/26

  with two or more fluidised beds, e.g. reactor and regeneration installations · CPC title

• B01J21/20

  Regeneration or reactivation · CPC title

• B01J8/08

  with moving particles (with fluidised particles B01J8/18) · CPC title