US4192652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing sulfur-containing coal or lignite for combustion having low SO2 emissions
Assignee: Atlantic Richfield Co
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Filing: 1977-12-27
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Granted: 1980-03-11
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Expires: 1997-12-27
Abstract
Abstract A process for preparing a coal or lignite fuel that contains sulfur for combustion wherein reduced amounts of sulfur-containing air contaminants are emitted from the combustion. In the disclosed process, the coal or lignite that contains sulfur is pulverized, deeply cleaned, mixed with a finely divided inorganic material, and then formed into briquettes or pellets.
Inventors
- 👤 Robert H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:41
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A process for preparing sulfur-containing coal or lignite for combustion having low SO 2 emissions, which comprises in combination: (a) reducing the particle size of said coal or lignite; (b) deeply cleaning said coal or lignite of reduced particle size; (c) admixing said clean coal or lignite with a finely divided inorganic material selected from the group consisting of an oxide; hydroxide; or carbonate of sodium, potassium, calcium or barium; and dolomite; (d) forming said resulting admixture into large particles.
Claim 2
Dependent Claim
80 words
A process for preparing sulfur-containing coal or lignite for combustion having low SO 2 emissions, which comprises in combination: (a) reducing the particle size of said coal or lignite; (b) deeply cleaning said coal or lignite of reduced particle size; (c) admixing said clean coal or lignite with a finely divided inorganic material selected from the group consisting of an oxide; hydroxide; or carbonate of sodium, potassium, calcium or barium; and dolomite; (d) forming said resulting admixture into large particles.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said coal or lignite from step (a) is cleaned by a heavy media method.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said coal or lignite from step (a) is cleaned by a Baum jig method.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein a binder material is incorporated into said admixture from step (c) prior to step (d).
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said large particles are pellets or briquettes.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein said inorganic material is limestone.
References Cited (Backward Citations)
US700888A
Cited
US709358A
Cited
US1856495A
Cited
GB535649A
Cited
US3026189A
Cited
US3756791A
Cited
US3948617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |