US4345992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic cracking process
Assignee: Phillips Petroleum Co
•
Filing: 1980-10-27
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Granted: 1982-08-24
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Expires: 2000-10-27
Abstract
Abstract In a cracking process wherein used catalyst is regenerated, contacted with reducing gas to counter effects of contaminating metals, and recycled to the cracking zone, the improvement comprising using a gas seal to assure that a major portion of the unconsumed reducing gas is also passed into the cracking zone.
Inventors
- 👤 Stone P. Washer
- 👤 Joe Van Pool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:31
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/24; C10G11/00; C10G11/14; C10G11/16; Y; Y10; Y10S; Y10S502/00; Y10S502/521
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
In a process for the catalytic cracking of hydrocarbons wherein said hydrocarbons are contacted with particulate cracking catalyst under cracking conditions in a cracking zone, portions of said cracking catalyst are continually transferred to a regeneration zone where carbonaceous materials thereon are consumed by combustion, the thus regenerated catalyst is continually transferred to a reduction zone wherein said catalyst is exposed to a reducing gas under conditions so that the adverse effects of contaminating metals thereon are at least reduced, and the thus reduced catalyst is continually transferred to the cracking zone, the improvement comprising using a gaseous seal upstream of the reducing zone to assure that the major portion of the unconsumed reducing gas passes into the cracking zone.
Claim 2
Dependent Claim
120 words
In a process for the catalytic cracking of hydrocarbons wherein said hydrocarbons are contacted with particulate cracking catalyst under cracking conditions in a cracking zone, portions of said cracking catalyst are continually transferred to a regeneration zone where carbonaceous materials thereon are consumed by combustion, the thus regenerated catalyst is continually transferred to a reduction zone wherein said catalyst is exposed to a reducing gas under conditions so that the adverse effects of contaminating metals thereon are at least reduced, and the thus reduced catalyst is continually transferred to the cracking zone, the improvement comprising using a gaseous seal upstream of the reducing zone to assure that the major portion of the unconsumed reducing gas passes into the cracking zone.
Claim 3
Dependent Claim
13 words
A process according to claim 1 wherein said catalytic cracking catalyst comprises silica-alumina.
Claim 4
Dependent Claim
14 words
A process according to claim 2 wherein said catalytic cracking catalyst comprises zeolitic silica-alumina.
Claim 5
Dependent Claim
12 words
A process according to claim 3 wherein said reducing gas comprises hydrogen.
Claim 6
Dependent Claim
13 words
A process according to claim 4 wherein gaseous seal is provided by steam.
Claim 7
Dependent Claim
15 words
A process according to claim 5 wherein said contaminating metals comprise nickel, vanadium, or iron.
Claim 8
Dependent Claim
68 words
A process according to claim 6 wherein said process comprises a moving bed cracking process wherein used catalyst is transferred to a regenerator, regenerated catalyst is transferred to a lift pot and then upwardly lifted in a lift leg to a disengaging vessel, and said regenerated catalyst is reduced with hydrogen that is introduced into the conduit which transfers catalyst from the disengaging vessel to the cracking zone.
Claim 9
Dependent Claim
27 words
A process according to claim 7 wherein said seal stream is introduced into the conduit which transfers the catalyst from the disengaging vessel to the cracking zone.
Claim 10
Dependent Claim
19 words
A process according to claim 8 wherein substantially all of the unconsumed hydrogen is passed to the cracking zone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |