US4303496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal liquefaction process
Assignee: Mobil Oil AS
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Filing: 1980-08-14
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Granted: 1981-12-01
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Expires: 2000-08-14
Abstract
Abstract The invention is directed to undertaking the liquefaction of coal in the presence of lignin.
Inventors
- 👤 Leslie R. Rudnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:58
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/042; C10G1/06; C10G1/065; C10G1/08; C10G1/083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A process for the liquefaction of coal comprising admixing the coal to be subjected to liquefaction with lignin wherein the amount of lignin ranges from about 0.01 to about 1% based on the weight of the coal; introducing the mixture of coal and lignin to a dissolver wherein said mixture is subjected to elevated temperature and elevated pressure for a period of time ranging from 0.5 to 180 minutes wherein said elevated temperature ranges from about 600° F. to about 1000° F. and wherein said elevated pressure ranges from about 50 to about 3000 psig; and separating light hydrocarbon fractions from a mixture of ash, undissolved coal, deashed coal and high quality coal extracts.
Claim 2
Dependent Claim
114 words
A process for the liquefaction of coal comprising admixing the coal to be subjected to liquefaction with lignin wherein the amount of lignin ranges from about 0.01 to about 1% based on the weight of the coal; introducing the mixture of coal and lignin to a dissolver wherein said mixture is subjected to elevated temperature and elevated pressure for a period of time ranging from 0.5 to 180 minutes wherein said elevated temperature ranges from about 600° F. to about 1000° F. and wherein said elevated pressure ranges from about 50 to about 3000 psig; and separating light hydrocarbon fractions from a mixture of ash, undissolved coal, deashed coal and high quality coal extracts.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein said mixture is subjected to elevated temperature and elevated pressure in the presence of hydrogen.
Claim 4
Dependent Claim
19 words
The process of claim 1, wherein the mixture contains a source of phenanthrene, dihydrophenanthrene, tetralins, hydropyrenes or mixtures thereof.
Claim 5
Dependent Claim
27 words
The process of claim 1, wherein the mixture contains a high quality coal extract, obtained by recycling at least a portion of the high quality coal extracts.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the mixture consists essentially of said coal and said lignin and is free of a liquefaction catalyst.
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein a liquefaction catalyst is added to the mixture in the dissolver.
Claim 8
Dependent Claim
11 words
The process of claim 6, wherein said catalyst is cobalt molybdate.
Claim 9
Dependent Claim
15 words
The process of claim 1, wherein the light hydrocarbon fractions are recycled into the dissolver.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |