US3948756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pentane insoluble asphaltene removal
Assignee: HRI Inc
•
Filing: 1973-09-13
•
Granted: 1976-04-06
•
Expires: 1993-09-13
Abstract
Abstract The maximum conversion and desulfurization of residual petroleum oils having a high content of asphaltenes can be attained by first converting a maximum amount of the asphaltenes contained in these feeds by pretreating the feeds with hydrogen under a selected combination of operating conditions. Conditions of temperature between 700° and 800°F, liquid space velocity between 0.1 and 2.0 V f /hr/V r and hydrogen partial pressure between 1200 and 3000 psig, result in a maximum conversion of asphaltenes when 5 to 45 volume percent of the 975°F+ fraction in the feedstock is converted to lower boiling fractions.
Inventors
- 👤 Ronald H. Wolk
- 👤 Govanon Nongbri
- 👤 Seymour B. Alpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:55
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A continuous catalytic process for the removal from residual petroleum oils of the pentene insoluble asphaltene fraction prior to hydrodesulfurization which comprises: a. feeding said residual oil with hydrogen upwardly through an ebullated bed reaction zone containing a particulate hydrogenation-type catalyst. b. maintaining said reaction zone at a temperature between about 700° and 800°F, liquid space velocity between about 0.1 and 2.0 V f /hr/V r and hydrogen partial pressure of between about 1200 and 3000 psi; c. converting between about 5 and 45 percent of the material in said residual oil boiling above 975°F to material boiling below 975°F to achieve at least a 20 weight percent conversion of said asphaltenes; d. passing the effluent to an atmospheric distillation zone; e. removing a vaporous overhead with an upper boiling point of less than about 800°F and a liquid bottom containing minimum pentane insoluble asphaltenes.
Claim 2
Dependent Claim
145 words
A continuous catalytic process for the removal from residual petroleum oils of the pentene insoluble asphaltene fraction prior to hydrodesulfurization which comprises: a. feeding said residual oil with hydrogen upwardly through an ebullated bed reaction zone containing a particulate hydrogenation-type catalyst. b. maintaining said reaction zone at a temperature between about 700° and 800°F, liquid space velocity between about 0.1 and 2.0 V f /hr/V r and hydrogen partial pressure of between about 1200 and 3000 psi; c. converting between about 5 and 45 percent of the material in said residual oil boiling above 975°F to material boiling below 975°F to achieve at least a 20 weight percent conversion of said asphaltenes; d. passing the effluent to an atmospheric distillation zone; e. removing a vaporous overhead with an upper boiling point of less than about 800°F and a liquid bottom containing minimum pentane insoluble asphaltenes.
Claim 3
Dependent Claim
47 words
The process of claim 1 wherein said residual oil is Heavy Venezuelan Atmospheric Residuum and wherein about 14 to 22 percent of the material in said oil boiling above 975°F is converted to material boiling below 975°F and more then 20 weight percent conversion of the asphaltenes.
Claim 4
Dependent Claim
48 words
The process of claim 1 wherein said residual oil is West Texas Vacuum Bottoms and wherein about 20 to 35 volume percent of the material in said oil boiling above 975°F is converted to material boiling below 975°F and more than 55 weight percent conversion of the asphaltenes.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein said liquid bottoms are desulfurized to produce a low sulfur overhead and a low sulfur bottoms.
Claim 6
Dependent Claim
46 words
The process of claim 1 wherein said reaction zone is maintained at a temperature between about 720°F and 780°F with a liquid space velocity therethrough between about 0.3 and 1.0 V f /hr/V r and under a hydrogen partial pressure between about 1500 and 2400 psi.
References Cited (Backward Citations)
US2768936A
Cited
US3068168A
Cited
US2950242A
Cited
US3183179A
Cited
US3429801A
Cited
US3622499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |