US4447315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocracking process
Assignee: Honeywell UOP LLC
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Filing: 1983-04-22
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Granted: 1984-05-08
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Expires: 2003-04-22
Abstract
Abstract A method is disclosed for hydrocracking a hydrocarbon feedstock having a propensity to form polynuclear aromatic compounds without excessively fouling the processing unit. The hydrocracking method includes contacting the hydrocarbon feedstock with a crystalline zeolite hydrocracking catalyst, contacting at least a portion of the resulting unconverted hydrocarbon oil containing polynuclear aromatic compounds with an adsorbent which selectively retains polynuclear aromatic compounds and recycling unconverted hydrocarbon oil having a reduced concentration of polynuclear aromatic compounds to the hydrocracking zone.
Inventors
- 👤 Paul R. Lamb
- 👤 Steve T. Bakas
- 👤 Brian M. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:53
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; C10G47/16; C10G25/00; C10G67/00; C10G67/02; C10G67/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A catalytic hydrocracking process which comprises: (a) contacting a hydrocarbon feedstock having a propensity to form polynuclear aromatic (PNA) compounds in a hydrocracking zone with added hydrogen and a metal promoted crystalline zeolite hydrocracking catalyst at elevated temperature and pressure sufficient to give a substantial conversion to lower boiling products; (b) condensing the hydrocarbon effluent from said hydrocracking zone and separating the same into a low boiling hydrocarbon product and unconverted hydrocarbon oil boiling above about 650° F. and containing trace quantities of polynuclear aromatic compounds: (c) contacting at least a portion of said unconverted hydrocarbon oil containing polynuclear aromatic compounds with an adsorbent which selectively retains said polynuclear aromatic compounds; and (d) recycling unconverted hydrocarbon oil having a reduced concentration of polynuclear aromatic compounds resulting from step (c) to said hydrocracking zone.
Claim 2
Dependent Claim
133 words
A catalytic hydrocracking process which comprises: (a) contacting a hydrocarbon feedstock having a propensity to form polynuclear aromatic (PNA) compounds in a hydrocracking zone with added hydrogen and a metal promoted crystalline zeolite hydrocracking catalyst at elevated temperature and pressure sufficient to give a substantial conversion to lower boiling products; (b) condensing the hydrocarbon effluent from said hydrocracking zone and separating the same into a low boiling hydrocarbon product and unconverted hydrocarbon oil boiling above about 650° F. and containing trace quantities of polynuclear aromatic compounds: (c) contacting at least a portion of said unconverted hydrocarbon oil containing polynuclear aromatic compounds with an adsorbent which selectively retains said polynuclear aromatic compounds; and (d) recycling unconverted hydrocarbon oil having a reduced concentration of polynuclear aromatic compounds resulting from step (c) to said hydrocracking zone.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said hydrocarbon feedstock comprises vacuum gas oil.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said hydrocracking zone is maintained at a pressure from about 1000 psig to about 3000 psig.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein said hydrocracking zone is maintained at a temperature from about 500° F. to about 775° F.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein said metal promoted crystalline zeolite hydrocracking catalyst comprises synthetic faujasite.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein said metal promoted crystalline zeolite hydrocracking catalyst comprises nickel and tungsten.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein said adsorbent is silica gel, activated carbon, activated alumina, silica-alumina gel, clay, molecular sieves or admixtures thereof.
Claim 9
Dependent Claim
55 words
The process of claim 1 wherein said unconverted hydrocarbon oil containing polynuclear aromatic compounds is contacted with said adsorbent at conditions which include a pressure from about 25 psig to about 500 psig, a temperature from about 100° F. to about 500° F. and a liquid hourly space velocity from about 0.5 to about 400.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |