Fluid catalytic cracking process

Patent metadata

Field	Value
Publication number	US-9328293-B2
Application number	US-201213564249-A
Country	US
Kind code	B2
Filing date	Aug 1, 2012
Priority date	Dec 22, 2008
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

One exemplary embodiment can be a fluid catalytic cracking process. The process can include a reaction zone operating at conditions to facilitate olefin production and including at least one riser. The at least one riser can receive a first feed having a boiling point of about 180° to about 800° C., and a second feed having more than about 70%, by weight, of one or more C 4 + olefins.

First claim

The invention claimed is:

1. A fluid catalytic cracking process, comprising:
operating a reaction zone at conditions to facilitate olefin production and comprising at least one riser;
receiving in the at least one riser:
1) a first feed having a boiling point of about 180 to about 800° C.;
2) a second feed comprising one or more C 4 + olefins comprising more than about 10%, by weight, butenes; and
3) a third feed comprising a naphtha stream including oligomers of butenes;

wherein the third feed is injected downstream of the second feed.

2. The process according to claim 1 , wherein a residence time of the second feed is less than about 3 seconds.

3. The process according to claim 2 , wherein a second feed point for the second feed is downstream of a first feed point for the first feed.

4. The process according to claim 1 , wherein a hydrocarbon partial pressure in the at least one riser is less than about 100 kPa.

5. The process according to claim 1 , wherein the temperature in the reaction zone is greater than about 500° C. to facilitate olefin production.

6. The process according to claim 1 , wherein the second feed comprises at least about 80%, by weight, of one or more C 4 + olefins.

7. The process according to claim 1 , wherein the second feed comprises at least about 90%, by weight, of one or more C 4 + olefins.

8. The process according to claim 1 , wherein a hydrocarbon partial pressure in the reaction zone is less than about 70 kPa.

9. The process according to claim 1 , wherein the temperature in the reaction zone is greater than about 550° C.

10. The process according to claim 1 , wherein the temperature in the reaction zone is greater than about 600° C.

11. The process according to claim 1 , wherein the at least one riser comprises a single riser having multiple injection points, wherein one or more upper injection points provide at least one feed having a residence time of less than about 0.5 seconds and one or more lower injection points provide at least one other feed having a residence time of about 0.5 to about 5 seconds.

12. The fluid catalytic cracking process of claim 1 wherein the third feed stream comprises a recycle naphtha stream.

13. The fluid catalytic cracking process of claim 12 wherein the third feed comprises no less than 70% olefins by weight.

14. A fluid catalytic cracking process, comprising:
receiving in a reaction zone comprising at least one riser:
a mixture of a first catalyst having pores with openings greater than about 0.7 nm and a second catalyst having smaller openings than the first catalyst,
a naphtha stream comprising about 20 to about 70%, by weight, one or more C 5 to C 10 olefin compounds,
a C 4 hydrocarbon stream comprising more than about 10%, by weight, butenes, and
a feed stream having a boiling point of about 180 to about 800° C.;
wherein an injection point for said naphtha stream is downstream of an injection point for said C 4 hydrocarbon stream.

15. The process according to claim 14 , further comprising a separation zone wherein the C4 hydrocarbon stream is recycled from the separation zone.

16. The process according to claim 14 , wherein the C4 hydrocarbon stream comprises at least about 20%, by weight, butenes.

17. The process according to claim 14 , wherein the C4 hydrocarbon stream comprises about 50 to about 70%, by weight, butenes.

18. The process according to claim 14 , wherein the C 4 hydrocarbon stream further comprises oligomers of butene.

19. A fluid catalytic cracking process, comprising:
A) receiving in a reaction zone comprising a riser:
a mixture of Y-zeolite and ZSM-5 zeolite,
a feed stream having a boiling point of about 180 to about 800° C.,
a naphtha stream comprising about 20 to about 70%, by weight, one or more C 5 to C 10 olefin compounds and
a C 4 hydrocarbon stream comprising more than about 10%, by weight, butenes,
wherein an injection point for said naphtha stream is downstream of an injection point for said C 4 hydrocarbon stream and an injection point for said feed stream;

B) separating the mixture from one or more reaction products in a disengagement zone; and
C) recovering the one or more reaction products in a separation zone.

20. The process according to claim 19 , wherein the C 4 hydrocarbon stream further comprises oligomers of butene.

Assignees

• Mehlberg Robert L
• Couch Keith A
• Hedrick Brian W
• Fei Zhihao
• Uop Llc

Inventors

• Mehlberg Robert L
• Couch Keith A
• Hedrick Brian W
• Fei Zhihao

Classifications

• C10G2300/1088

  Olefins · CPC title

• C10G2400/20

  C2-C4 olefins · CPC title

• C10G2400/02

  Gasoline · CPC title

• C10G11/18 Primary

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

• C10G2300/1044

  Heavy gasoline or naphtha having a boiling range of about 100 - 180 °C · CPC title