US3859200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Residual oil hydrodesulfurization process at reduced hydrogen rate with ammonia addition
Assignee: Gulf Research and Development Co
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Filing: 1974-01-22
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Granted: 1975-01-07
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Expires: 1994-01-22
Abstract
Abstract A process for hydrodesulfurizing an asphaltic oil in the presence of a catalyst comprising Group VI and Group VIII metals on alumina together with hydrogen and added ammonia. The process is controlled at least in part by decreasing the hydrogen flow rate to compensate for catalyst aging, thereby increasing the concentration of ammonia in the reaction gaseous atmosphere.
Inventors
- 👤 Louis W Brunn
- 👤 James A Frayer
- 👤 Franklin E Massoth
- 👤 John A Paraskos
- 👤 Stephen J Yanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:06
CPC Classifications
C; C10; C10G; C10G49/00; C10G49/007; C10G65/00; C10G65/02; C10G65/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
127 words
A PROCESS FOR THE HYDRODESULFURIZATION OF AN ASPHALTENECONTAINING OIL COMPRISING PASSING SAID OIL AND HYDROGEN AT A RATE OF 3,000 TO 20,000 STANDARD CUBIC FEET OF HYDROGEN PER BARREL OF FEED OIL OVER A SULFIDED CATALYST COMPRISING GROUP VI AND GROUP VIII METALS ON ALUMINA AT A TEMPERATURE BETWEEN 600* AND 900*F., ADDING AMMONIA TO SAID CATALYST IN AN AMOUNT TO INCREASE HYDRODESULFURIZATION IN SAID PROCESS AS COMPARED TO THE ABSENCE OF SAID AMMONIA, THE AMMONIA CONCENTRATION IN THE REACTOR GASES BEING LOWER THAN THE AVERAGE HYDROGEN SULFIDE CONCENTRATION IN SAID GASES, AND COMPENSATING FOR CATALYST DEACTIVATION DUE TO CATALYST AGING, AT LEAST IN PART, BY DECREASING HYDROGEN FLOW RATE TO SAID PROCESS WITHIN SAID RANGE TO INCREASE AMMONIA AND HYDROGEN SULFIDE CONCENTRATION IN THE REACTOR GASES.
Claim 2
Dependent Claim
127 words
A PROCESS FOR THE HYDRODESULFURIZATION OF AN ASPHALTENECONTAINING OIL COMPRISING PASSING SAID OIL AND HYDROGEN AT A RATE OF 3,000 TO 20,000 STANDARD CUBIC FEET OF HYDROGEN PER BARREL OF FEED OIL OVER A SULFIDED CATALYST COMPRISING GROUP VI AND GROUP VIII METALS ON ALUMINA AT A TEMPERATURE BETWEEN 600* AND 900*F., ADDING AMMONIA TO SAID CATALYST IN AN AMOUNT TO INCREASE HYDRODESULFURIZATION IN SAID PROCESS AS COMPARED TO THE ABSENCE OF SAID AMMONIA, THE AMMONIA CONCENTRATION IN THE REACTOR GASES BEING LOWER THAN THE AVERAGE HYDROGEN SULFIDE CONCENTRATION IN SAID GASES, AND COMPENSATING FOR CATALYST DEACTIVATION DUE TO CATALYST AGING, AT LEAST IN PART, BY DECREASING HYDROGEN FLOW RATE TO SAID PROCESS WITHIN SAID RANGE TO INCREASE AMMONIA AND HYDROGEN SULFIDE CONCENTRATION IN THE REACTOR GASES.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said hydrogen flow rate is decreased incrementally to compensate for progressive decrease in catalyst activity.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said hydrogen flow rate is at least 3,500 standard cubic feet of hydrogen per barrel.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein ammonia is added to said catalyst prior to charging said oil within said temperature range.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the ratio of said ammonia to said oil is changed during said process.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said catalyst comprises cobalt and molybdenum.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein said catalyst comprises nickel, cobalt and molybdenum.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the pressure is at least 750 psi.
Claim 10
Dependent Claim
26 words
The process of claim 1 wherein less than 20 percent of said oil is converted to material boiling below the initial boiling point of said oil.
Claim 11
Dependent Claim
26 words
The process of claim 1 wherein less than 10 percent of said oil is converted to material boiling below the initial boiling point of said oil.
Claim 12
Dependent Claim
22 words
The process of claim 1 wherein between 150 and 1,500 standard cubic feet of hydrogen per barrel of feed oil are consumed.
Claim 13
Dependent Claim
20 words
The process of claim 1 wherein at least 10 barrels of said oil are charged per pound of said catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |