US3607721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating a bituminous froth
Assignee: Petro Canada Exploration Inc
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Filing: 1969-06-30
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Granted: 1971-09-21
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Expires: 1989-06-30
Abstract
Abstract A method for the removal of solids and emulsified water from a bituminous froth resulting from the hot water treatment of Athabasca tar sands. The froth is diluted with a light hydrocarbon diluent such as coker naphtha and fed to a settling vessel where the solids and water droplets settle out in the form of a sludge constituting a concentrated stable emulsion containing most of the impurities. The substantially purified bituminous froth is withdrawn as overflow. The settled sludge is removed from the bottom of the vessel at rates of between 4 and 5 percent by volume of the diluted bituminous froth feed rate and centrifuged to recover its oil content.
Inventors
- 👤 Elmer Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
The method of claim 1 wherein said sludge is withdrawn from the settling zone at a rate of between 4% and 5% by volume of said diluted bituminous froth feed.
Claim 2
Dependent Claim
38 words
The method of claim 1 wherein said step of maintaining said diluted bituminous froth in the settling zone for a sufficient residence time comprises maintaining said diluted froth in the settling zone for a minimum of 1 hour.
Claim 3
Dependent Claim
30 words
The method of claim 3 wherein said sludge is withdrawn from the settling zone at a rate of between 4% and 5% by volume of said diluted bituminous froth feed.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said diluent is coker distillate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |