US4032428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefaction of coal
Assignee: Mobil Oil AS
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Filing: 1976-01-28
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Granted: 1977-06-28
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Expires: 1996-01-28
Abstract
Abstract This invention provides an improved process for solvent-refining coal which involves heating an admixture of coal and a thermally stable organic solvent to solubilize substantially the coal to form a slurry of liquefaction phase and a residual solids phase, and thereafter passing the slurry through a filter bed of crushed raw coal to separate the liquefaction phase from the solids phase.
Inventors
- 👤 George C. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:24
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/045; C10G1/08; C10G1/083
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In a process for the liquefaction of coal, the improvement which comprises admixing comminuted coal with a thermally stable organic solvent having a boiling point in the range between about 450° and 950° F.; heating the admixture at a temperature between about 500° and 900° F. for a period of time sufficient to solubilize substantially the coal and form a slurry of a homogeneous liquefaction phase and a solids phase of ash and residual coal; thereafter passing the said slurry through a filter bed zone to separate the liquefaction phase from the solids phase, wherein said filter bed comprises crushed raw coal; and recovering the liquefaction phase as an effluent from the filter bed zone.
Claim 2
Dependent Claim
115 words
In a process for the liquefaction of coal, the improvement which comprises admixing comminuted coal with a thermally stable organic solvent having a boiling point in the range between about 450° and 950° F.; heating the admixture at a temperature between about 500° and 900° F. for a period of time sufficient to solubilize substantially the coal and form a slurry of a homogeneous liquefaction phase and a solids phase of ash and residual coal; thereafter passing the said slurry through a filter bed zone to separate the liquefaction phase from the solids phase, wherein said filter bed comprises crushed raw coal; and recovering the liquefaction phase as an effluent from the filter bed zone.
Claim 3
Dependent Claim
29 words
A process in accordance with claim 1 wherein the said admixture of coal and organic solvent is heated for a period of time between about 0.1 and 5 hours.
Claim 4
Dependent Claim
39 words
A process in accordance with claim 1 wherein the organic solvent in the admixture is present in a quantity between about 0.5 and 10 parts by weight of organic solvent per part by weight of coal in the admixture.
Claim 5
Dependent Claim
31 words
A process in accordance with claim 1 wherein the crushed raw coal in the filter bed zone has an average particle diameter in the range between about 0.05 and 0.5 inches.
Claim 6
Dependent Claim
42 words
A process in accordance with claim 1 wherein the slurry of liquefaction phase and solids phase is passed upward through a downward moving filter bed of crushed raw coal, and the liquefaction phase free of solids is recovered as an overhead stream.
Claim 7
Dependent Claim
32 words
A process in accordance with claim 1 wherein the slurry of liquefaction phase and solid phase is passed through the filter bed zone at a temperature between about 400° and 750° F.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |