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US3950505A
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Preparation of manganous hydroxide
Assignee: Diamond Shamrock Corp
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Filing: 1975-04-28
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Granted: 1976-04-13
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Expires: 1995-04-28
Abstract
Abstract Manganous oxide is converted directly to manganous hydroxide by hydration in the presence of a catalyst. The product has high purity and reactivity.
Inventors
- 👤 Irving Sochol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:49
CPC Classifications
C; C01; C01G; C01G45/00; C01G45/03; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A method for preparing manganous hydroxide comprising the steps of adding at least one manganese solubilizing agent selected from the group consisting of acetic acid, propionic acid, butyric acid, nitric acid, and the ammonium and manganese salts thereof to an aqueous slurry of manganous oxide in an amount sufficient to form a 0.05 to 1.0 molar solution and maintaining the slurry at a temperature between about 40°C. and the boiling point of the solution until the manganous oxide is substantially converted to manganous hydroxide.
Claim 2
Independent Claim
84 words
A method for preparing manganous hydroxide comprising the steps of adding at least one manganese solubilizing agent selected from the group consisting of acetic acid, propionic acid, butyric acid, nitric acid, and the ammonium and manganese salts thereof to an aqueous slurry of manganous oxide in an amount sufficient to form a 0.05 to 1.0 molar solution and maintaining the slurry at a temperature between about 40°C. and the boiling point of the solution until the manganous oxide is substantially converted to manganous hydroxide.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the manganese solubilizing agent is acetic acid.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the manganese solubilizing agent is propionic acid.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the manganese solubilizing agent is nitric acid.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the amount of manganese solubilizing agent added results in the formation of a 0.2 to 0.4 molar solution.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the slurry temperature is maintained between about 90°C. and about 100°C.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein the slurry is maintained at a temperature above about 40°C. for at least 30 minutes after addition of the manganese solubilizing agent.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein 0.01 to 0.1% of a reducing agent is also added to the aqueous slurry.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein 0.05 to 0.1% of hydrazine is also added to the aqueous slurry.
Claim 11
Dependent Claim
20 words
The method of claim 1 wherein the manganous oxide contains up to 0.6% available oxygen expressed as MnO 2 .
Claim 12
Independent Claim
67 words
A method for preparing manganous hydroxide comprising the steps of adding solid manganous oxide to a 0.2-0.4 molar aqueous solution of at least one manganese solubilizing agent selected from acetic acid, propionic acid, and nitric acid, adding 0.05-0.1% hydrazine, agitating the mixture, maintaining the mixture at a temperature of 90°-100°C. for at least 30 minutes, filtering the mixture to remove unreacted manganous oxide, and recovering manganous hydroxide.
Claim 13
Independent Claim
67 words
A method for preparing manganous hydroxide comprising the steps of adding solid manganous oxide to a 0.2-0.4 molar aqueous solution of at least one manganese solubilizing agent selected from acetic acid, propionic acid, and nitric acid, adding 0.05-0.1% hydrazine, agitating the mixture, maintaining the mixture at a temperature of 90°-100°C. for at least 30 minutes, filtering the mixture to remove unreacted manganous oxide, and recovering manganous hydroxide.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |