Patent US3617464A successfully refreshed from Google Patents.
US3617464A
Expired / Lapsed
US
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Coal extraction method and apparatus
Assignee: Total Energy Corp
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Filing: 1970-05-20
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Granted: 1971-11-02
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Expires: 1990-05-20
Abstract
Abstract Method for extracting coil liquids from a continuously moving bed of coal solids comprising the steps of moving the coal solids through extractor and stripper zones in a stream of sand which serves as a conveyor for the coal solids. The sand also serves as a cleaning means for filter screens used in the process. Further, the sand stream permits the coal liquids to swell freely.
Inventors
- 👤 Cecil J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:52
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/0242; C; C10; C10G; C10G1/00; C10G1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A method of continuously extracting coal liquids from solid coal as defined in claim 1 wherein the solvent introduced to the top of the secondary extractor zone is heated to a temperature of between 700*-900* F.
Claim 2
Dependent Claim
35 words
A method of continuously extracting coal liquids from solid coal as defined in claim 2 wherein the solvent introduced to the top of the primary extractor is cooled to a temperature of between 500*-650* F.
Claim 3
Independent Claim
69 words
A method of continuously extracting coal liquids from solid coal comprising the steps of entraining a stream of coal solids in a stream of fluid media to the top of an extractor tower, continuously moving said intermixed stream through an extractor zone and a stripper zone, introducing a solvent first to said stripper zone and then to said extractor zone for stripping and extracting coal liquids from said solids.
Claim 4
Dependent Claim
26 words
The method of claim 4 and including the further step of passing said stream through a hot wash zone for further removal of adhered coal liquids.
Claim 5
Dependent Claim
44 words
A method of continuously extracting coal liquids from solid coal as defined in claim 5 and including the step of introducing said wash-water to separator for separating the emulsified coal liquids and water and recycling the separated water for reuse in the wash zone.
Claim 6
Dependent Claim
39 words
A method of continuously extracting coal liquids from solid coal as defined in claim 4 wherein coal liquids are filtered from the solid stream between zones and said fluid media is used as a filter cleaner for preventing clogging.
Claim 7
Dependent Claim
38 words
A method of continuously extracting coal liquids from solid coal as defined in claim 4 and wherein said fluid media is sand and said sand conveys the coal solids through said zones and removes contaminants from said tower.
Claim 8
Independent Claim
48 words
A method of continuously extracting liquids from solid carbonaceous materials comprising the steps of entraining a stream of carbonaceous solids in a stream of fluid media, continuously moving said stream through a liquid extraction zone and introducing a means to said zone for extracting liquids from said solids.
Claim 9
Dependent Claim
21 words
A method of continuously extracting liquids from solid carbonaceous materials as defined in claim 9 wherein said fluid media is sand.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |