US4028221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefaction of sub-bituminous and lignitic coal
Assignee: Lummus Technology LLC
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Filing: 1975-06-06
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Granted: 1977-06-07
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Expires: 1995-06-06
Abstract
Abstract In the liquefaction of a sub-bituminous and/or lignitic coal, prior to the liquefaction, the coal is soaked at a temperature of from 550° to 750° F and a pressure of from 30 to 300 psig for a time sufficient to remove at least 10% of the organic oxygen present in the coal to thereby reduce the hydrogen requirements of the liquefaction. The liquefaction is effected with a pasting solvent derived from the sub-bituminous and/or lignitic coal having a 5 volume percent distillation temperature of at least 550° F and containing at least 25 weight percent of material boiling above 800° F. The use of such a pasting solvent provides for improved dispersion of the coal particles during the liquefaction.
Inventors
- 👤 Morgan C. Sze
- 👤 George J. Snell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:26
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
55 words
In a process for the hydroliquefaction of a coal selected from the group consisting of sub-bituminous and lignitic coals, the improvement comprising: employing as a pasting solvent for said hydroliquefaction, a liquid fraction produced by the hydroliquefaction of said coal, said liquid fraction containing at least 25 weight percent of components boiling above 800° F.
Claim 2
Dependent Claim
55 words
In a process for the hydroliquefaction of a coal selected from the group consisting of sub-bituminous and lignitic coals, the improvement comprising: employing as a pasting solvent for said hydroliquefaction, a liquid fraction produced by the hydroliquefaction of said coal, said liquid fraction containing at least 25 weight percent of components boiling above 800° F.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the pasting solvent has a 5 volume percent distillation temperature of at least about 550° F.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein the pasting solvent has from about 35% to about 70%, by weight, of components boiling above 800° F.
Claim 5
Dependent Claim
34 words
The process of claim 3 wherein the hydroliquefaction is effected at a temperature of from about 600° F to about 900° F and at a pressure of from about 500 to about 4000 psig.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said coal is a brown coal.
Claim 7
Dependent Claim
56 words
The process of claim 1 wherein said coal is heat soaked at a temperature of at least about 500° F and a pressure of no greater than about 300 psig for a time sufficient to remove at least 10% of the organic oxygen present in the coal, said heat soaking being effected prior to said hydroliquefaction.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein said coal is heat soaked in said pasting solvent.
Claim 9
Dependent Claim
22 words
The process of claim 7 wherein the heat soaking is effected at a temperature of from about 550° F to 750° F.
Claim 10
Dependent Claim
27 words
The process of claim 8 wherein the heat soaking is effected to remove from about 15% to about 60% of the organic oxygen present in the coal.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein said coal is a brown coal.
Claim 12
Dependent Claim
39 words
The process of claim 7 wherein the pasting solvent has a 5 volume percent distillation temperature of at least about 550° F and from about 35% to about 70%, by weight, of the components thereof boiling above 800° F.
Claim 13
Dependent Claim
34 words
The process of claim 11 wherein the hydroliquefaction is effected at a temperature of from about 600° F to about 900° F and at a pressure of from about 500 to about 4000 psig.
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) | 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 |