Patent US3718577A successfully refreshed from Google Patents.
US3718577A
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Control of hydrocracking process for constant conversion
Assignee: Mobil Oil AS
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Filing: 1971-07-16
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Granted: 1973-02-27
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Expires: 1991-07-16
Abstract
Abstract The level of conversion of a hydrocracking operation is controlled as a function of the amount of carbon determined in the recycle gas stream separated from the effluent of the hydrocracking operation.
Inventors
- 👤 Y Nai
- 👤 Y Tsoung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:47
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/36; Y; Y10; Y10S; Y10S208/00; Y10S208/01; Y10T; Y10T436/00; Y10T436/12; Y10T436/23
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
28 words
The method of claim 1 wherein the preheat temperature of the reactant streams is adjusted in response to said generated signal to maintain a predetermined level of conversion.
Claim 2
Dependent Claim
15 words
The method of claim 1 wherein the signal is generated with a hydrogen flame detector.
Claim 3
Dependent Claim
50 words
The method of claim 1 wherein gaseous material comprising C1 to C4 hydrocarbons comprising the effluent of the hydrocracking operation are determined for carbon content and the carbon content thus determined is used to control the level of conversion of the hydrocracking operation with the parameters defined by FIG. 2.
Claim 4
Dependent Claim
45 words
The method of claim 1 wherein the level of conversion of the hydrocracking operation is controlled as a function of the dry gas yield so as to provide a product boiling in the range of 180* to 290*F. in excess of 35 wt. percent yield.
Claim 5
Dependent Claim
51 words
The method of claim 1 wherein the conversion level of the hydrocracking operation is controlled as a function of the amount of carbon in the gaseous effluent boiling below C4 hydrocarbons so as to maintain a level of conversion per pass selected from within the range of 50 to 100 percent.
Claim 6
Dependent Claim
61 words
The method of claim 1 wherein the amount of carbon in the dry gas effluent of a hydrocracking operation is used to generate a signal indicative of the level of conversion of said hydrocracking operation and changes in the level of conversion of said hydrocracking operation are made in response to said generated signal to achieve a desired level of conversion.
References Cited (Backward Citations)
US3463613A
Cited
US3592606A
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 |