Riser separation systems

1. An apparatus for separating a gaseous mixture from a stream of particles entering from a riser reactor used for cracking a hydrocarbon feed with said stream of particles, said apparatus comprises:

a reaction vessel comprising a lower stripping bed area and an upper secondary separator area;

a riser reactor within the reaction vessel, the riser reactor defining a longitudinal axis and including a riser reactor inlet at one end for receiving the hydrocarbon feed and the stream of particles and at least one riser reactor outlet at an opposite end for evacuating a mixture of cracked gases and solid particles;

a separation vessel defined proximate to the at least one riser reactor outlet, the separation vessel comprising:

in an alternating manner, at least one separation chamber and at least one collection chamber distributed about the longitudinal axis, each separation chamber comprises two vertical lateral walls which also comprise a wall of an adjacent one of the at least one collection chamber, the at least one separation chamber including a separation chamber inlet in an upper area of the separation chamber communicating with the riser reactor, wherein a lateral separation chamber outlet is defined in at least one of the vertical lateral walls to provide fluid and particle communication from the lateral separation chamber to the adjacent one of the at least one collection chamber; and

at least one collection chamber deflector positioned in the at least one collection chamber.

2. The apparatus of claim 1 , wherein the at least one separation chamber includes two separation chambers, with one of the at least one collection chambers therebetween, and wherein the at least one collection chamber deflector extends between one of the two vertical lateral walls of a first one of the two separation chambers and one of the two vertical lateral walls of a second one of the two separation chambers.

3. The apparatus of claim 1 , wherein each collection chamber comprises a collection chamber outer wall that includes a stripping gas entrance window to allow a stripping gas from at least one stripping gas injector proximate to the lower stripping bed area to enter the collection chamber.

4. The apparatus of claim 3 , wherein each collection chamber comprises a collection chamber floor that together with the collection chamber outer wall, the vertical lateral walls and the central riser reactor define the collection chamber.

5. The apparatus of claim 4 , wherein the at least one collection chamber deflector includes a concave surface facing the collection chamber floor.

6. The apparatus of claim 1 , wherein the at least one collection chamber deflector includes a downward pointing cusp portion.

7. The apparatus of claim 6 , wherein the cusp portion is centrally located between two of the vertical lateral walls.

8. The apparatus of claim 1 , wherein the collection chamber deflector includes a divider baffle extending from a concave surface of the collection chamber deflector.

9. The apparatus of claim 8 , wherein the divider baffle extends beyond a lower edge of the deflector in a direction parallel to the longitudinal axis.

10. The apparatus of claim 1 , further comprising at least one collection chamber conduit in an upper area of the collection chamber for evacuating the cracked gases and a minor portion of the solid particles from the collection chambers to a gas outlet collector.

11. The apparatus of claim 10 , wherein the at least one collection chamber conduit extends downward through the collection chamber deflector.

12. The apparatus of claim 1 , wherein each collection chamber comprises a collection chamber outer wall that extends from the lateral separation chamber outlet into the lower stripping bed area.

13. The apparatus of claim 12 , wherein each collection chamber includes a collection chamber floor, wherein the collection chamber floor, the collection chamber outer wall, the vertical lateral walls and the central riser reactor together define the collection chamber.

14. The apparatus of claim 12 , wherein each collection chamber outer wall extends to form a single common dipleg that extends into the lower stripping bed in a continuous circumferential direction around the riser reactor.

15. The apparatus of claim 12 , wherein each collection chamber outer wall extends to form a respective dipleg that extends into the lower stripping bed.

16. The apparatus of claim 1 , wherein each collection chamber is surrounded by a common collection chamber floor, wherein the collection chamber floor, the collection chamber outer wall, the vertical lateral walls and the central riser reactor together define the collection chamber.

17. The apparatus of claim 1 , wherein at least one of the at least one separation chamber further comprises a separation chamber deflector positioned at least partially above the lateral separation chamber outlet.

18. The apparatus of claim 17 , wherein the separation chamber deflector is unitarily formed with the collection chamber deflector.

19. The apparatus of claim 1 , wherein the at least one collection chamber deflector is positioned at least partially above the lateral separation chamber outlet.

20. The apparatus of claim 1 , wherein the riser reactor includes a parabolic concave cone-shaped riser deflector at the at least one riser reactor outlet.

21. An apparatus for separating a gaseous mixture from a stream of particles entering from a riser reactor used for cracking a hydrocarbon feed with said stream of particles, said apparatus comprises:

a reaction vessel comprising a lower stripping bed area and an upper secondary separator area;

a riser reactor within the reaction vessel, the riser reactor defining a longitudinal axis and including a riser reactor inlet at one end for receiving the hydrocarbon feed and the stream of particles and at least one riser reactor outlet at an opposite end for evacuating a mixture of cracked gases and solid particles;

a separation vessel defined proximate to the at least one riser reactor outlet, the separation vessel comprising, in an alternating manner, at least one separation chamber and at least one collection chamber distributed about the longitudinal axis, each separation chamber comprises two vertical lateral walls which also comprise a wall of the adjacent collection chamber, the separation chamber including a separation chamber inlet in an upper area of the separation chamber communicating with the riser reactor; and

a lateral separation chamber outlet defined in at least one of the vertical lateral walls to provide fluid and particle communication from the separation chamber to an adjacent one of the at least one collection chamber, wherein each collection chamber comprises a collection chamber outer wall that extends from the lateral separation chamber outlet into the lower stripping bed area, and wherein each separation chamber further comprises a separation chamber outer wall that extends from the separation chamber inlet into the lower stripping bed area.

22. The apparatus of claim 21 , wherein the collection chamber outer wall is a common collection chamber outer wall that extends towards the lower stripping bed in a continuous circumferential direction around the riser reactor.

23. The apparatus of claim 21 , wherein the collection chamber outer wall includes an inclination section towards the riser reactor and a vertical wall below the inclination section.

24. The apparatus of claim 21 , wherein the collection chamber outer wall has a diameter equal to or less than a diameter of the separation chamber outer wall.

25. The apparatus of claim 21 , further comprising at least one collection chamber deflector positioned in the adjacent gas collection chamber at least partially above the lateral separation chamber outlet.

26. The apparatus of claim 25 , wherein the at least one collection chamber deflector is positioned at least partially above the lateral separation chamber outlet.

27. The apparatus of claim 25 , wherein the at least one collection chamber deflector includes a concave surface facing the lower stripping bed area.

28. The apparatus of claim 25 , wherein the at least one separation chamber is two separation chambers, and wherein the at least one collection chamber deflector extends between one of the two vertical lateral walls of a first one of the two separation chambers and one of the two vertical lateral walls of a second one of the two separation chambers.

29. The apparatus of claim 25 , wherein the at least one collection chamber deflector includes a downward pointing cusp portion.

30. The apparatus of claim 29 , wherein the cusp portion is centrally located between two of the vertical lateral walls.

31. The apparatus of claim 25 , wherein the collection chamber deflector includes a divider baffle extending from a concave surface for the collection chamber deflector.

32. The apparatus of claim 31 , wherein the divider baffle extends beyond a lower edge of the deflector in a direction parallel to the longitudinal axis.

33. The apparatus of claim 25 , further comprising at least one collection chamber conduit in an upper area of the collection chamber for evacuating the cracked gases and a minor portion of the solid particles from the collection chambers to a gas outlet collector.

34. The apparatus of claim 33 , wherein the at least one collection chamber conduit extends downward through the collection chamber deflector.

35. The apparatus of claim 25 , wherein at least one of the at least one separation chamber further comprises a separation chamber deflector positioned at least partially above the lateral separation chamber outlet.

36. The apparatus of claim 35 , wherein the separation chamber deflector is unitarily formed with the collection chamber deflector.

37. The apparatus of claim 21 , wherein the riser reactor includes a parabolic concave cone-shaped riser deflector at the at least one riser reactor outlet.