US3905893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural stage residue hydrodesulfurization process
Assignee: Gulf Research and Development Co
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Filing: 1973-08-22
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Granted: 1975-09-16
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Expires: 1993-08-22
Abstract
Abstract A multiple stage process is described for the catalytic hydrodesulfurization and hydrodemetallization of a residual petroleum oil boiling above the gasoline range. The product of the process comprises essentially material boiling above the gasoline range and comprises little material boiling below the initial boiling point of the residual oil feed. The hydrodesulfurization-demetallization process comprises an initial stage involving relatively high hydrogen pressure in the presence of a catalyst comprising a relatively low proportion of catalytically active hydrogenation metals. The process employs a final stage in series having a relatively lower hydrogen pressure and a catalyst comprising a relatively higher proportion of hydrogenation metals. The stream entering the final stage contains an amount up to 10, 20 or even 25 weight percent of the asphaltene content of the charge to the first stage while the effluent from the final stage is essentially free of asphaltenes.
Inventors
- 👤 Robert D Christman
- 👤 Alfred M Henke
- 👤 John A Paraskos
- 👤 Geoffrey R Wilson
- 👤 Stephen J Yanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:26
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
252 words
A PROCESS FOR HYDRODESULFURIZING A FEED RESIUAL PETROLEUM OIL CONTAINING ASPHALTENES, METAL AND SULFUR TO A SUBSTANTIALLY ASPHALTENE-FREE OIL WITHOUT A DISTLLATION OR SOLVENT EXTRACTION STEP FOR REMOVAL OF ASPHALTENES COMPISING PASSING SAID FEED OIL AND HYDROGEN THROUGH A PLURALITY OF HYDRODESULFURIZATION STAGES IN SERIES INCLUDING AN INITIAL STAGE AND A FINAL STAGE EACH OPERATING AT A TEMPERATURE BETWEEN ABOUT 650* AND 800*F., EACH STAGE EMPLOYING A CATALYST COMPRISING GROUP VI AND GROUP VIII METALS ON ALUMINA, INCREASING THE TEMPERATURE IN EACH STAGE WITH INCREASING CATALYST AGE-TO COMPENSATE FOR CATALYSTACTIVITY AGING LOSS, MAINTAINING A LOWER HYDROGEN PRESSURE IN SAID FINAL STAGE IN SAID INITIAL STAGE, REMOVING ASPHALTENES, METAL AND SULFUR FROM THE FEED OIL IN SAID INITIAL AND SAID FINAL STAGES WITH A GREATER AMOUNT OF METALS AND SULFUR BEING REMOVED FROM THE FEED OIL IN SAID INITIAL STAGE THAN IN SAID FINAL STAGE, OPERATING SAID FINAL STAGE AT A HYDROGEN PRESSURE BETWEEN 1,300 AND 1,900 PSI AND OPERATING SAID INITIAL STAGE AT A HYDROGEN PRESSURE UP TO 2,300 PSI WHICH IS HIGHER THAN THE PRESSURE IN SAID FINAL STAGE SO THAT THE RATIO OF PERCEN DEMETALLIZTION TO PERCENT DESULFURIZTION IS HIGHER IN THE FINAL STAGE THAN IN THE INITIAL STAGE, THE CATALYST N SAID FINAL STAGE COMPRISING A HIGHER WEIGHT PERCENT OF GROUP VI AND GROUP VII METALS THAN THE CATALYST IN SAID INITIAL STAGE SO THAT THE FINAL STAGE PRODUCED A SUBSTANTIALLY ASPHALTENE FREE HYDRODESULFURIZED EFFLUENT COMPRISING MORE THAN 80 VOLUME PERCENT YIELD BOILING THE GASOLINE RANGE BASED ON FEED.
Claim 2
Dependent Claim
252 words
A PROCESS FOR HYDRODESULFURIZING A FEED RESIUAL PETROLEUM OIL CONTAINING ASPHALTENES, METAL AND SULFUR TO A SUBSTANTIALLY ASPHALTENE-FREE OIL WITHOUT A DISTLLATION OR SOLVENT EXTRACTION STEP FOR REMOVAL OF ASPHALTENES COMPISING PASSING SAID FEED OIL AND HYDROGEN THROUGH A PLURALITY OF HYDRODESULFURIZATION STAGES IN SERIES INCLUDING AN INITIAL STAGE AND A FINAL STAGE EACH OPERATING AT A TEMPERATURE BETWEEN ABOUT 650* AND 800*F., EACH STAGE EMPLOYING A CATALYST COMPRISING GROUP VI AND GROUP VIII METALS ON ALUMINA, INCREASING THE TEMPERATURE IN EACH STAGE WITH INCREASING CATALYST AGE-TO COMPENSATE FOR CATALYSTACTIVITY AGING LOSS, MAINTAINING A LOWER HYDROGEN PRESSURE IN SAID FINAL STAGE IN SAID INITIAL STAGE, REMOVING ASPHALTENES, METAL AND SULFUR FROM THE FEED OIL IN SAID INITIAL AND SAID FINAL STAGES WITH A GREATER AMOUNT OF METALS AND SULFUR BEING REMOVED FROM THE FEED OIL IN SAID INITIAL STAGE THAN IN SAID FINAL STAGE, OPERATING SAID FINAL STAGE AT A HYDROGEN PRESSURE BETWEEN 1,300 AND 1,900 PSI AND OPERATING SAID INITIAL STAGE AT A HYDROGEN PRESSURE UP TO 2,300 PSI WHICH IS HIGHER THAN THE PRESSURE IN SAID FINAL STAGE SO THAT THE RATIO OF PERCEN DEMETALLIZTION TO PERCENT DESULFURIZTION IS HIGHER IN THE FINAL STAGE THAN IN THE INITIAL STAGE, THE CATALYST N SAID FINAL STAGE COMPRISING A HIGHER WEIGHT PERCENT OF GROUP VI AND GROUP VII METALS THAN THE CATALYST IN SAID INITIAL STAGE SO THAT THE FINAL STAGE PRODUCED A SUBSTANTIALLY ASPHALTENE FREE HYDRODESULFURIZED EFFLUENT COMPRISING MORE THAN 80 VOLUME PERCENT YIELD BOILING THE GASOLINE RANGE BASED ON FEED.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the final temperature in said initial and final stage is about the same and is reached at about the same time in process operation.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the asphaltenefree hydrodesulfurized effluent comprises more than 90 volume percent boiling above the gasoline range based on feed.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the asphaltenefree hydrodesulfurized effluent comprises more than 95 volume percent boiling above the gasoline range based on feed.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein the asphaltene-free hydrodesulfurized effluent comprises more than 98 volume percent boiling above the gasoline range based on feed.
Claim 7
Dependent Claim
15 words
The process of claim 1 including a hydrodesulfurization stage between said initial and final stages.
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |