US3723598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry cyclic process utilizing a manganous oxide absorbent for removal of dilute sulfur values from gas streams
Assignee: Kennecott Utah Copper LLC
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Filing: 1970-11-05
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Granted: 1973-03-27
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Expires: 1990-11-05
Abstract
Abstract Manganous oxide is utilized as a dry absorbent for dilute sulfur values, such as SO2 and SO3, in a gas stream of the nature of waste effluent from industrial stacks of smelters, power plants, etc. The resulting manganese sulfate is regenerated to provide dry manganous oxide for recycling to the gas stream. Regeneration is effected by dry calcination of the manganese sulfate under reducing conditions.
Inventors
- 👤 H Spedden
- 👤 K Richards
- 👤 W Schlitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:33
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
A process according to claim 1, wherein the manganous oxide reactant is formed initially from a manganese-bearing material in which the manganese values are in a form capable of conversion to manganous oxide by calcination under reducing conditions, said material being fed directly to the regeneration stage of the process.
Claim 2
Dependent Claim
14 words
A process according to claim 2, wherein the manganese-bearing material is a manganese ore.
Claim 3
Dependent Claim
17 words
A process according to claim 2, wherein the manganese-bearing material is made up of deep sea nodules.
Claim 4
Dependent Claim
53 words
A process according to claim 1, wherein make-up quantities of the manganous oxide reactant are provided from time to time by feeding directly to the regeneration stage of the process a manganese-bearing material in which the manganese values are in a form capable of conversion to manganous oxide by calcination under reducing conditions.
Claim 5
Dependent Claim
34 words
A process according to claim 1, wherein the reducing conditions during regeneration are provided by mixing a solid carbonaceous reducing agent with the spent reductant from the sulfur extracting stage prior to calcination thereof.
Claim 6
Dependent Claim
20 words
A process according to claim 1, wherein the reducing conditions are provided by maintaining a gaseous reducing atmosphere during calcination.
Claim 7
Dependent Claim
22 words
A process according to claim 1, wherein the effluent gases during the calcination stage are recovered and processed for their sulfur content.
References Cited (Backward Citations)
US2824047A
Cited
US2984545A
Cited
US3150923A
Cited
US3411865A
Cited
US3492083A
Cited
US3330096A
Cited
US3501897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |