Multi-catalyst injection system

1. A multi-catalyst injection system comprising:

a vessel configured to deliver catalyst to a fluid catalytic cracking unit;

a separator disposed in the vessel and defining at least two compartments within the vessel;

a plenum defined in the vessel and fluidly coupled to each compartments, wherein the plenum is pressurizable; and

a plurality of dispense mechanisms, a respective one of each dispense mechanisms coupled to a respective compartment.

2. The system of claim 1 , wherein the separator extends from a bottom of the vessel to an elevation short of a top of the vessel.

3. The system of claim 2 , wherein the separator is substantially planar.

4. The system of claim 2 , wherein the separator comprises:

two or more flanges extending radially outward from a common joint, the two or more flanges forming an angle therebetween that is less than approximately 180 degrees.

5. The system of claim 4 , wherein at least one of the two or more flanges is rotatable around the common joint.

6. The system of claim 1 , wherein the at least two of the compartments have different volumes.

7. The system of claim 1 , wherein the at least two compartments are substantially equal in volume.

8. The system of claim 1 , wherein at least one of the compartments has an adjustable volume.

9. The system of claim 1 further comprising:

aplurality of catalyst fill ports disposed through a top of the vessel, wherein the plenum is positioned proximate the fill ports.

10. The system of claim 1 , wherein the vessel is closed.

11. The system of claim 1 , wherein the vessel further comprises:

a pressure vessel.

12. A fluid catalytic cracking system comprising:

a fluid catalytic cracking unit;

a catalyst injection vessel coupled to the fluid catalytic cracking unit, the vessel having a plurality of catalyst storage compartments; and

a separator coupled to a bottom of the vessel and extending to an elevation short of a top of the vessel.

13. The system of claim 12 , wherein the separator comprises:

two or more flanges extending radially outward from a common joint, at least two of the flanges forming a dog-leg orientation.

14. The system of claim 12 , wherein the separator comprises:

two or more flanges extending radially outward from a common joint, at least two of the flanges rotatable around the common joint.

15. The system of claim 12 , wherein at least two of the catalyst storage compartments have different volumes.

16. The system of claim 12 , wherein at least two of the catalyst storage compartments are substantially equal in volume.

17. The system of claim 12 further comprising:

a plurality of catalyst fill ports disposed through a top of the vessel; and

a plenum is positioned within the vessel proximate the fill ports and fluidly coupled to the catalyst storage compartments.

18. The system of claim 12 further comprising:

a pressurizing system coupled to the vessel adapted to control the pressure within the vessel in a range of about 5 to about 80 pounds per square inch (about 0.35 to about 5.6 kg/cm2).

19. The system of claim 12 further comprising:

a respective metering device coupled to each catalyst storage compartment.

20. The system of claim 12 , wherein at least one of the catalyst storage compartments has an adjustable volume.

21. The system of claim 12 , wherein the catalyst injection vessel is closed.

22. The system of claim 12 , wherein the catalyst injection vessel further comprises:

a pressure vessel.

23. The system of claim 12 , wherein the compartments of the catalyst injection vessel are pressurizable.

24. A fluid catalytic cracking system comprising:

a fluid catalytic cracking unit;

a catalyst injection vessel coupled to the fluid catalytic cracking unit, the vessel having a plurality of catalyst storage compartment;

a separator coupled between a bottom and a top of the vessel; and

at least one hole extending through the separator proximate the top of the vessel.

25. A method for injecting catalyst into a fluid catalytic cracking unit, comprising:

storing catalyst in a first compartment of a vessel;

storing catalyst in a second compartment of the vessel, wherein the catalyst stored in the first and second compartments are chemically different; and

dispensing catalyst from the first compartment into a fluid catalytic cracking.

26. The method of claim 25 further comprising:

adjusting a volume of at least one of the compartments.

27. The method of claim 25 further comprising:

dispensing catalyst from the second compartment into the fluid catalytic cracking unit.

28. The method of claim 27 , wherein the step of dispensing catalyst from the first and second compartments occurs sequentially.

a pressure vessel.

29. The method of claim 27 , wherein the step of dispensing catalyst from the first and second compartments occurs simultaneously.

30. The method of claim 25 , wherein dispensing further comprising:

pressurizing a plenum above and fluidly communicating with the first and second compartments.