Patent US5005370A successfully refreshed from Google Patents.
Patent US4210422A successfully refreshed from Google Patents.
US4210422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of sulfur compounds from coal during pipeline transport
Assignee: Shell USA Inc
•
Filing: 1978-12-26
•
Granted: 1980-07-01
•
Expires: 1998-12-26
Abstract
Abstract Sulfur compounds are removed from coal during preparation of the coal for pipeline transport and during pipeline transport of the coal by preparing the coal in particles sufficiently fine for transport as an aqueous slurry, mixing the coal particles with oxygenated water and a basic chemical substance, transporting the coal as a slurry in a pipeline, separating the coal from water containing soluble sulfur compounds and from sludge-containing insoluble sulfur compounds.
Inventors
- 👤 Paul E. Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:33
CPC Classifications
C; C10; C10L; C10L9/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A process for removal of sulfur compounds from coal during preparation of the coal for pipeline transport and pipeline transport of the coal, comprising: storing the coal in contact with oxygenated water for 1 to 7 days; preparing the coal in particles sufficiently fine for transport as an aqueous slurry; mixing the coal particles with oxygenated water and a basic chemical substance selected from the group consisting of calcium carbonates, sodium hydroxide, ammonium hydroxide, ammonia, and sodium carbonate; transporting the coal as a slurry in a pipeline; and separating the coal from water containing soluble sulfur compounds and from sludge-containing insoluble sulfur compounds.
Claim 2
Dependent Claim
103 words
A process for removal of sulfur compounds from coal during preparation of the coal for pipeline transport and pipeline transport of the coal, comprising: storing the coal in contact with oxygenated water for 1 to 7 days; preparing the coal in particles sufficiently fine for transport as an aqueous slurry; mixing the coal particles with oxygenated water and a basic chemical substance selected from the group consisting of calcium carbonates, sodium hydroxide, ammonium hydroxide, ammonia, and sodium carbonate; transporting the coal as a slurry in a pipeline; and separating the coal from water containing soluble sulfur compounds and from sludge-containing insoluble sulfur compounds.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the coal is prepared for slurry pipeline transport by wet grinding .
Claim 4
Dependent Claim
16 words
The process of claim 2, wherein more oxygenated water is added after wet grinding the coal.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein said basic chemical substance is added along with said last added oxygenated water.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the particle size range of coal particles in the slurry is from 0.004 mm to 5 mm.
References Cited (Backward Citations)
US2346151A
Cited
US3824084A
Cited
US4055400A
Cited
US4054420A
Cited
US3993456A
Cited
US4080176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |