US4224038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing sulfur from coal
Assignee: Atlantic Richfield Co
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Filing: 1978-06-19
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Granted: 1980-09-23
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Expires: 1998-06-19
Abstract
Abstract A process for reducing the sulfur content of coal comprising: (1) contacting an aqueous slurry of coal-oil agglomerates at elevated temperature with oxygen; and (2) recovering coal-oil agglomerates wherein the coal has reduced sulfur content.
Inventors
- 👤 George P. Masologites
- 👤 Emmett H. Burk, Jr.
- 👤 Jin S. Yoo
- 👤 John A. Karch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:26
CPC Classifications
C; C10; C10L; C10L9/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
35 words
A process for reducing the sulfur content of coal comprising: (1) contacting an aqueous slurry of coal-oil agglomerates at elevated temperature with oxygen; and (2) recovering coal-oil agglomerates wherein the coal has reduced sulfur content.
Claim 2
Dependent Claim
35 words
A process for reducing the sulfur content of coal comprising: (1) contacting an aqueous slurry of coal-oil agglomerates at elevated temperature with oxygen; and (2) recovering coal-oil agglomerates wherein the coal has reduced sulfur content.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 150° F. to about 500° F.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein the oxygen is at a pressure of from about 50 to 500 psig.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the oil is derived from petroleum.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein the oil is derived from shale oil.
Claim 7
Dependent Claim
13 words
The process of claim 3 wherein the oil is derived from tar sand.
Claim 8
Dependent Claim
12 words
The process of claim 3 wherein the oil is derived from coal.
Claim 9
Dependent Claim
13 words
The process of claim 3 wherein the oil is a refined petroleum fraction.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein the coal-oil agglomerates contain from about 5% to 60%, by weight of coal, of hydrocarbon oil.
Claim 11
Dependent Claim
22 words
The process of claim 3 wherein the coal-oil agglomerates contain from about 5% to 30%, by weight of coal, of hydrocarbon oil.
Claim 12
Dependent Claim
17 words
The process of claim 10 wherein the hydrocarbon oil is hydrocarbon oil with a high aromatic content.
Claim 13
Dependent Claim
13 words
The process of claim 3 wherein oxygen gas is mixed with inert gas.
Claim 14
Dependent Claim
25 words
The process of claim 3 wherein a pH of from about 6.5 to 12.0 is maintained by adding a basic material to the aqueous slurry.
Claim 15
Dependent Claim
36 words
The process of claim 13 wherein the basic material is an alkali metal material is selected from the group consisting of potassium hydroxide, sodium hydroxide, potassium bicarbonate, sodium bicarbonate, ammonium carbonate and bicarbonate and mixtures thereof.
Claim 16
Dependent Claim
15 words
The process of claim 13 wherein the basic material is an alkaline earth metal material.
Claim 17
Dependent Claim
24 words
The process of claim 15 wherein the alkaline earth metal material is selected from the group consisting of calcium hydroxide, limestone and mixtures thereof.
Claim 18
Dependent Claim
22 words
The process of claim 3 wherein the aqueous slurry of coal-oil agglomerates contains from about 5 to 70%, by weight, coil-oil agglomerates.
Claim 19
Dependent Claim
22 words
The process of claim 15 wherein the aqueous slurry of coal-oil agglomerates contains from about 10 to 60%, by weight, coal-oil agglomerates.
Claim 20
Dependent Claim
27 words
The process of claim 1 wherein hydrocarbon oil is removed from coal-oil agglomerates wherein the coal has reduced sulfur content to recover coal reduced in sulfur content.
References Cited (Backward Citations)
US3824084A
Cited
US4018571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |