IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0021274
(2004-12-23)
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등록번호 |
US-7682501
(2010-04-21)
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발명자
/ 주소 |
- Soni, Dalip S
- Castagnos, Leonce F
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
19 |
초록
▼
An apparatus and method for processing different feeds in a fluid catalytic cracking unit are disclosed which result in improved yields of C3, C4 and gasoline range hydrocarbons as compared to conventional systems. The process comprises injecting a main hydrocarbon feed into a catalyst-containing ri
An apparatus and method for processing different feeds in a fluid catalytic cracking unit are disclosed which result in improved yields of C3, C4 and gasoline range hydrocarbons as compared to conventional systems. The process comprises injecting a main hydrocarbon feed into a catalyst-containing riser reactor through a plurality of main feed injectors, and injecting a light hydrocarbon feed into the riser reactor at a location upstream from the main feed injectors and downstream from a control valve such as a regenerated catalyst slide valve, the light feed being injected in a region having a high density of catalyst particles. The light feed is injected in a dispersed way such the amount of feed injected corresponds to the density of catalyst particles at that particular point, with greater amounts of feed being injected at locations having a large number of catalyst particles. Also, a heavy hydrocarbon feed or a heavy recycle stream from the same FCC unit can be injected at the same elevation as the main feed injectors but through separate injectors.
대표청구항
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What is claimed is: 1. A fluid catalytic cracking process for increasing yields of C3 and C4 hydrocarbons, comprising: (a) injecting a main feed comprising hydrocarbons with boiling points in the range of 400° F. to 1150° F. into a riser reactor of a fluid catalytic cracking apparatus thr
What is claimed is: 1. A fluid catalytic cracking process for increasing yields of C3 and C4 hydrocarbons, comprising: (a) injecting a main feed comprising hydrocarbons with boiling points in the range of 400° F. to 1150° F. into a riser reactor of a fluid catalytic cracking apparatus through a set of main feed injectors, the riser reactor including a downwardly slanted portion and a vertical portion disposed downstream from the downwardly slanted portion, and (b) injecting a light feed comprising hydrocarbons with boiling points of no more than about 440° F. into said fluid catalytic cracking apparatus through a first light feed injector disposed at the lower end of the riser reactor and through a second light feed injector disposed on the downwardly slanted portion of the riser reactor upstream from the first light feed injector, the first and second light feed injectors being positioned at locations at which catalyst flow changes direction and is not uniform. 2. A process according to claim 1, wherein said light feed is injected into a conduit portion of said riser reactor. 3. A process according to claim 2, wherein said conduit portion has a lower catalyst density region and a higher catalyst density region. 4. A process according to claim 3, wherein said light feed is injected into said higher catalyst density region. 5. A process according to claim 3, wherein a larger portion of said light feed is injected into said higher catalyst density region than into said lower catalyst density region. 6. A process according to claim 1, further comprising the step of: (c) injecting a heavy feed comprising hydrocarbons with boiling points in the range of 570° F. to 1275° F. through a set of heavy feed injectors. 7. A process according to claim 6, wherein said set of heavy feed injectors is positioned at the same elevation on said riser reactor as said set of main feed injectors. 8. A process according to claim 5, further comprising the step of: (c) injecting a heavy feed comprising hydrocarbons with boiling points of in the range of 570° F. to 1275° F. through a set of heavy feed injectors. 9. A process according to claim 8, wherein said set of heavy feed injectors is positioned at the same elevation on said riser reactor as said set of main feed injectors. 10. A process according to claim 7, wherein about 1 to 10 wt % of said main feed is recycled and injected in step (c). 11. A process according to claim 7, wherein the mass flow rate of said heavy feed through said heavy feed injectors is about 1 to 10 wt % of the mass flow rate of said main feed through said main feed injectors. 12. A process according to claim 2, wherein said light feed is injected downstream from a control valve positioned between said catalyst regenerator and said conduit portion of said riser reactor. 13. A process according to claim 12, wherein said control valve is a regenerated catalyst slide valve. 14. A process according to claim 1, wherein the yield of C3 and C4 hydrocarbons from said fluid catalytic cracking process is improved by at least 2% over a process in which said light feed is injected at one location upstream from said main feed. 15. A process according to claim 1, wherein the yield of propylene is at least 2% higher than the yield of propylene in a process in which said light feed is injected at one location upstream from said main feed. 16. A process according to claim 1, wherein said catalyst is a zeolite. 17. A fluid catalytic cracking process for increasing yields of C3, C4 and gasoline range hydrocarbons, comprising: (a) injecting a main feed comprising hydrocarbons with boiling points in the range of 400° F. to 1150° F. into a riser reactor of a fluid catalytic cracking apparatus through a set of main feed injectors, the riser reactor including a downwardly slanted portion and a vertical portion disposed downstream from the downwardly slanted portion, (b) injecting a heavy feed comprising hydrocarbons with boiling points in the range of 570° F. to 1275° F. through a set of heavy feed injectors positioned at the same elevation on said riser reactor as said set of main feed injectors, and (c) injecting a light feed comprising hydrocarbons with boiling points of no more than about 440° F. into said fluid catalytic cracking apparatus through first and second light feed injectors positioned upstream from said main feed injectors at locations at which catalyst flow changes direction and is not uniform, the second light feed injector being positioned on the downwardly slanted portion of the riser reactor. 18. A process according to claim 17, wherein said light feed is injected into a conduit portion of said riser reactor. 19. A process according to claim 18, wherein said conduit portion has a lower catalyst density region and a higher catalyst density region, and a larger portion of said light feed is injected into said higher catalyst density region than into said lower catalyst density region. 20. A process according to claim 1, further comprising injecting a light feed comprising hydrocarbons with boiling points of no more than about 440° F. into said fluid catalytic cracking apparatus through a third light feed injector disposed adjacent to the first light feed injector. 21. A process according to claim 20, further comprising injecting a light feed comprising hydrocarbons with boiling points of no more than about 440° F. into said fluid catalytic cracking apparatus through a fourth light feed injector disposed adjacent to the second light feed injector. 22. A process according to claim 21, wherein the fourth light feed injector injects light feed into the downwardly slanted portion. 23. A process according to claim 17, wherein the second light feed injector is disposed upstream from the first light feed injector. 24. A process according to claim 23, wherein light feed is injected through a third light feed injector disposed adjacent to the first light feed injector and a fourth light feed injector disposed adjacent to the second light feed injector.
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