US4028219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of deashed coal liquifaction products
Assignee: Kerr McGee Corp
•
Filing: 1975-10-23
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Granted: 1977-06-07
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Expires: 1995-10-23
Abstract
Abstract This invention relates to an improved process for the production of deashed coal which includes contacting coal with coal dissolving solvent at elevated temperature and pressure in a hydrogen atmosphere and thereafter passing the resulting mixture to a vacuum tower to remove coal dissolving solvent for recirculation and leave vacuum tower still bottoms, which are substantially free of coal dissolving solvent. Said still bottoms then are contacted with a solubilizing solvent to dissolve a substantial quantity of said still bottoms after which said dissolved still bottoms are separated from undissolved still bottoms. The separation procedure may be effected by settling, countercurrent decantation, or filtration using pressure precoated rotary and plate filters and the like.
Inventors
- 👤 Roger Allen Baldwin
- 👤 Robert Elliott Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:16
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065; C10G1/006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
In a process which comrises preparing coal liquefaction products by contracting coal with coal dissolving solvent at elevated temperature and pressure in a hydrogen atmosphere, passing the resulting mixture to a vaccum tower to remove coal dissolving solvent for recirculation and leave still bottoms substantially free of such coal dissolving solvent, the improvements which comprise contacting said vacuum tower still bottoms, which are substantially free of coal dissolving solvent, with a solubilizing solvent to dissolve a substantial quantity of said still bottoms and separating said dissolved still bottoms from undissolved still bottoms.
Claim 2
Dependent Claim
92 words
In a process which comrises preparing coal liquefaction products by contracting coal with coal dissolving solvent at elevated temperature and pressure in a hydrogen atmosphere, passing the resulting mixture to a vaccum tower to remove coal dissolving solvent for recirculation and leave still bottoms substantially free of such coal dissolving solvent, the improvements which comprise contacting said vacuum tower still bottoms, which are substantially free of coal dissolving solvent, with a solubilizing solvent to dissolve a substantial quantity of said still bottoms and separating said dissolved still bottoms from undissolved still bottoms.
Claim 3
Dependent Claim
20 words
A process as set forth in claim 1 in which the solubilizing solvent is separated from the undissolved still bottoms.
Claim 4
Dependent Claim
31 words
A process as set forth in claim 1 in which the solubilizing solvent is separated from the undissolved still bottoms and is recycled for contact with fresh vacuum tower still bottoms.
Claim 5
Dependent Claim
23 words
A process as set forth in claim 1 in which the dissolved still bottoms are separated from the undissolved still bottoms by settling.
Claim 6
Dependent Claim
24 words
A process as set forth in claim 1 in which the dissolved still bottoms are separated from the undissolved still bottoms by countercurrent decantation.
Claim 7
Dependent Claim
23 words
A process as set forth in claim 1 in which the dissolved still bottoms are separated from the undissolved still bottoms by filtration.
Claim 8
Dependent Claim
36 words
A process as set forth in claim 1 in which the still bottoms and solubilizing solvent are contacted for up to about 2 hours at a temperature of from about 190° F to about 400° F.
Claim 9
Dependent Claim
19 words
A process as set forth in claim 1 in which solubilizing solvent is recovered from the dissolved still bottoms.
Claim 10
Dependent Claim
29 words
A process as set forth in claim 1 in which solubilizing solvent is recovered from the dissolved still bottoms and recycled for contact with fresh vacuum tower still bottoms.
Claim 11
Dependent Claim
24 words
A process as set forth in claim 1 in which the undissolved still bottoms are treated to recover the carbon and hydrogen values therefrom.
References Cited (Backward Citations)
US2871181A
Cited
US2989458A
Cited
US3075912A
Cited
US3010893A
Cited
US3598718A
Cited
US3852183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |