Process for cracking a hydrocarbon feed

Patent metadata

Field	Value
Publication number	US-9227167-B2
Application number	US-201113189624-A
Country	US
Kind code	B2
Filing date	Jul 25, 2011
Priority date	Dec 11, 2008
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

An embodiment can be a process for catalytically cracking a hydrocarbon feed. The process can include providing the hydrocarbon feed including an effective amount of one or more C4-C6 olefins for producing at least one light olefin to a riser. Typically, at least about 99%, by mole, of the hydrocarbon feed is a gas.

First claim

The invention claimed is:

1. A fluid catalytic cracking process, comprising:
a) receiving spent catalyst at a first elevation and regenerated catalyst at a second elevation in a riser of a reaction zone, said riser having a top and a bottom, wherein the first elevation is lower than the second; and
b) providing a gaseous hydrocarbon feed through a gas distributor contained near the bottom of the riser in communication with said hydrocarbon feed comprising an effective amount of one or more C4-C6 olefins for producing propylene, said hydrocarbon feed including at least about 40% by mole C4 hydrocarbons, wherein at least a portion of said gaseous hydrocarbon feed is provided below the first elevation.

2. The process according to claim 1 , wherein the spent and regenerated catalyst comprise, independently, a mixture, in turn comprising a first catalyst having pores with openings greater than about 0.7 nm and a second catalyst having smaller openings than the first catalyst.

3. The process according to claim 2 , wherein the first catalyst comprises a Y-zeolite and the second catalyst comprises ZSM-5 zeolite.

4. The process according to claim 1 , wherein the hydrocarbon feed comprises about 15 to about 75%, by volume, of one or more C4-C6 olefins.

5. The process according to claim 4 , wherein the hydrocarbon feed comprises about 30 to about 50%, by volume, of one or more C4-C6 olefins.

6. The process according to claim 1 , wherein the reaction zone further comprises a reaction vessel and a disengagement zone; and the disengagement zone communicates with the riser for providing the spent catalyst.

7. The process according to claim 1 , wherein the hydrocarbon feed is a gas.

8. The process according to claim 6 , further comprising a separation zone.

9. The process according to claim 8 , wherein the separation zone provides at least a portion of the C4-C6 olefins to the hydrocarbon feed.

10. The process according to claim 1 , wherein the gas distributor further comprises a substantially vertically orientated pipe forming an opening.

11. The process according to claim 10 , wherein the substantially vertically orientated pipe has a diameter expanding from a bottom to a top.

12. The process according to claim 11 , wherein the gas distributor further comprises a member forming a plurality of holes coupled to the top of the substantially vertically orientated pipe.

13. The process according to claim 12 , wherein the gas distributor further comprises a plurality of tubes positioned in, respectively, at least some of the plurality of holes.

14. A process for catalytically cracking a hydrocarbon feed, comprising providing the hydrocarbon feed comprising an effective amount of one or more C4-C6 olefins for producing at least one light olefin to a riser wherein at least about 99%, by mole, of the hydrocarbon feed is a gas; adding a spent catalyst at a first point and a regenerated catalyst at a second point in the riser wherein the second point is higher than the first point; and wherein at least a portion of said hydrocarbon feed is provided below a spent catalyst inlet to the riser.

15. The process according to claim 14 , further comprising adding a fluidization gas and steam to the hydrocarbon feed before introduction into the riser.

Assignees

• Palmas Paolo
• Mehlberg Robert L
• Couch Keith A
• Nishimura Paul S
• Uop Llc

Inventors

• Palmas Paolo
• Mehlberg Robert L
• Couch Keith A
• Nishimura Paul S

Classifications

• B01J8/1827 Primary

  the fluidising gas being a reactant · CPC title

• C07C4/06

  Catalytic processes {(C07C4/025 takes precedence)} · CPC title

• C10G2400/20

  C2-C4 olefins · CPC title

• C10G11/18

  according to the "fluidised-bed" technique · CPC title

• B01J8/0065

  by impingement against stationary members · CPC title