US4083696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for desulfurizing pipelined coal
Assignee: Texaco Inc
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Filing: 1976-07-12
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Granted: 1978-04-11
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Expires: 1996-07-12
Abstract
Abstract Disclosed is a process for reducing the pyritic content of coal while a coal-water slurry is transported in a pipeline by injecting a pyrite oxidant into the pipeline upstream of the dewatering plant associated therewith.
Inventors
- 👤 Edward L. Cole
- 👤 Matthew A. McMahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:48
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
A process for reducing the pyritic sulfur content of coal as it is being transported through a pipeline as a coal-water slurry under conditions of turbulent flow at a Reynolds number of less than 2000 from a slurry preparation plant to a dewatering plant which comprises injecting into said slurry in at least one point upstream of said dewatering plant a pyrite oxidant and thereafter increasing the Reynolds number to above 3000.
Claim 2
Dependent Claim
72 words
A process for reducing the pyritic sulfur content of coal as it is being transported through a pipeline as a coal-water slurry under conditions of turbulent flow at a Reynolds number of less than 2000 from a slurry preparation plant to a dewatering plant which comprises injecting into said slurry in at least one point upstream of said dewatering plant a pyrite oxidant and thereafter increasing the Reynolds number to above 3000.
Claim 3
Dependent Claim
28 words
The process of claim 1 in which the pyrite oxidant is added in an amount between 1 and 1.5 the stoichiometric amount of pyritic sulfur in said coal.
Claim 4
Dependent Claim
34 words
The process of claim 1 in which the pyrite oxidant is selected from the group consisting of hydrogen peroxide, ferric chloride, nitric acid, ferric sulfate, an oxygen-containing gas, sodium hypochlorite and an organic peracid.
Claim 5
Dependent Claim
16 words
The process of claim 1 in which the temperature is between about 70° and 100° F.
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) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |