US4385982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of bitumen from tar sands
Assignee: ConocoPhillips Co
•
Filing: 1981-05-14
•
Granted: 1983-05-31
•
Expires: 2001-05-14
Abstract
Abstract Bitumen contained in tar sands is extracted in a primary extraction step which produces a bitumen-containing froth. A hydrogen donor diluent solvent is added to the froth, and the froth-solvent mix is subjected to a desalting operation. A bitumen-solvent product from the desalting step is subjected to a coking operation. In one embodiment, a delayed coker is used, and a gas oil fraction from the coker overhead vapors in hydrogenated and used as the donor solvent in the desalting step.
Inventors
- 👤 Ardis L. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:51
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/04; C10B57/045; C10G; C10G1/00; C10G1/002; C10G1/04; C10G1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A process for recovering bitumen from tar sands comprising: (a) subjecting tar sands to a primary extraction step; (b) recovering a bitumen-containing froth from said primary extraction step; (c) adding a hydrogen donor diluent solvent to said froth; (d) subjecting said froth and added hydrogen donor diluent solvent to a desalting step; (e) passing bitumen and hydrogen donor diluent solvent from said desalting step to a delayed coking operation; (f) recovering overhead vapors from said delayed coking operation and fractionating said vapors; (g) recovering a gas oil fraction from said fractionating step; (h) hydrotreating said gas oil fraction to produce a hydrogen donor diluent solvent; and (i) utilizing said hydrogen donor diluent solvent as the solvent added to said froth in step (c).
Claim 2
Dependent Claim
123 words
A process for recovering bitumen from tar sands comprising: (a) subjecting tar sands to a primary extraction step; (b) recovering a bitumen-containing froth from said primary extraction step; (c) adding a hydrogen donor diluent solvent to said froth; (d) subjecting said froth and added hydrogen donor diluent solvent to a desalting step; (e) passing bitumen and hydrogen donor diluent solvent from said desalting step to a delayed coking operation; (f) recovering overhead vapors from said delayed coking operation and fractionating said vapors; (g) recovering a gas oil fraction from said fractionating step; (h) hydrotreating said gas oil fraction to produce a hydrogen donor diluent solvent; and (i) utilizing said hydrogen donor diluent solvent as the solvent added to said froth in step (c).
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) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |