Patent US3718575A successfully refreshed from Google Patents.
US3718575A
Expired / Lapsed
US
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Hydrocracking for lpg production
Assignee: Universal Oil Products Co
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Filing: 1971-07-12
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Granted: 1973-02-27
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Expires: 1991-07-12
Abstract
Abstract Liquefied petroleum gas, herein referred to as ''''LPG,'''' is produced from heavy hydrocarbon distillates through the utilization of a two-stage hydrocracking process. The product effluent from the first stage is separated to provide a vaporous gasoline boiling range fraction which is utilized as the charge stock to the second stage.
Inventors
- 👤 C Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:11
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/10; C10G2400/00; C10G2400/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
The process of claim 1 further characterized in that at least a portion of said first liquid phase is recycled to said first reaction zone.
Claim 2
Dependent Claim
25 words
The process of claim 1 further characterized in that at least a portion of said third liquid phase is recycled to said second reaction zone.
Claim 3
Dependent Claim
25 words
The process of claim 1 further characterized in that at least a portion of said third liquid phase is recycled to said first separation zone.
Claim 4
Dependent Claim
43 words
The process of claim 1 further characterized in that said first and second reaction zones are catalytic, and contain a catalytic composite of a porous carrier material and at least one metallic component selected from Groups VI-B and VIII of the Periodic Table.
Claim 5
Dependent Claim
35 words
The process of claim 5 further characterized in that the catalyst disposed in said first reaction zone is a composite of an amorphous carrier material, a Group VI-B metal component and an iron-group metal component.
Claim 6
Dependent Claim
31 words
The process of claim 5 further characterized in that the catalyst disposed in said second reaction zone is a composite of a zeolitic carrier material and a Group VIII metal component.
References Cited (Backward Citations)
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Cited
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Cited
US3256178A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |