US4022588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidative chemical removal of pyritic sulfur from coal by manganese, vanadium, and cerium oxidants
Assignee: Mobil Oil AS
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Filing: 1976-03-05
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Granted: 1977-05-10
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Expires: 1996-03-05
Abstract
Abstract A process is disclosed in which pyritic sulfur in coals is removed by treatment with aqueous solutions containing manganese, vanadium and cerium metal oxidants.
Inventors
- 👤 Ralph M. Dessau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:30
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
In an oxidative solubilization process for reducing the pyritic sulfur content of coal wherein coal is reacted with an aqueous solution of metal oxidant and a coal product having a reduced content of pyritic sulfur is thereafter recovered, the improvement which comprises using a metal oxidant selected from the group consisting of manganese, vanadium and cerium oxidants.
Claim 2
Dependent Claim
57 words
In an oxidative solubilization process for reducing the pyritic sulfur content of coal wherein coal is reacted with an aqueous solution of metal oxidant and a coal product having a reduced content of pyritic sulfur is thereafter recovered, the improvement which comprises using a metal oxidant selected from the group consisting of manganese, vanadium and cerium oxidants.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein the aqueous solution is acidified and has a pH in the range of 1 to about 5.
Claim 4
Dependent Claim
19 words
The process of claim 2, wherein the metal oxidant is a higher valent compound of manganese, vanadium or cerium.
Claim 5
Dependent Claim
13 words
The process of claim 2, wherein the metal oxidant is soluble manganese dioxide.
Claim 6
Dependent Claim
12 words
The process of claim 2, wherein the metal oxidant is ammonium vanadate.
Claim 7
Dependent Claim
13 words
The process of claim 2, wherein the metal oxidant is ceric ammonium nitrate.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |