US4309390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of cobalt and manganese from trimellitic acid process residue by extraction, pH adjustment, and magnet
Assignee: BP Corp North America Inc
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Filing: 1980-12-19
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Granted: 1982-01-05
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Expires: 2000-12-19
Abstract
Abstract Recovery of cobalt and manganese metal oxidation catalysts from residue of trimellitic acid manufacture and separation of recovered cobalt from recovered manganese can be accomplished by a novel method involving dissolving the residue in water, displacing dissolved cobalt as cobalt metal by manganese metal added to the solution whose pH has been adjusted to pH of 6 and then using magnetic means for separating metallic cobalt from the cobalt-free solution.
Inventors
- 👤 Jon J. Harper
- 👤 Stephen J. Pietsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:29
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B3/00; C22B3/20; C22B3/22; C22B47/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A method of recovery of cobalt and manganese from residue of trimellitic acid manufacture and separation of recovered cobalt from recovered manganese which comprises combining water with said residue while hot at a weight ratio of water to residue of from 0.5:1 up to 6:1 at a final temperature of from 75° C. up to 125° C., at least adjusting the pH of the resulting mixture to pH6, adding powdered manganese to the pH-adjusted solution in an amount of at least 1.0 chemical equivalent of the dissolved cobalt for its precipitation as metallic cobalt, and subjecting the resulting suspension to a magnetic separator for the recovery of metallic cobalt and the separation of a cobalt-free solution of increased manganese ion concentration.
Claim 2
Independent Claim
121 words
A method of recovery of cobalt and manganese from residue of trimellitic acid manufacture and separation of recovered cobalt from recovered manganese which comprises combining water with said residue while hot at a weight ratio of water to residue of from 0.5:1 up to 6:1 at a final temperature of from 75° C. up to 125° C., at least adjusting the pH of the resulting mixture to pH6, adding powdered manganese to the pH-adjusted solution in an amount of at least 1.0 chemical equivalent of the dissolved cobalt for its precipitation as metallic cobalt, and subjecting the resulting suspension to a magnetic separator for the recovery of metallic cobalt and the separation of a cobalt-free solution of increased manganese ion concentration.
Claim 3
Dependent Claim
53 words
The method of claim 1 wherein the weight ratio of water to residue is from 1:1 up to 3:1, the pH adjustment is made by addition of ammonium hydroxide to the solution of residue in water, powdered manganese is added in an amount of from 1.3 to 1.5 chemical equivalents of dissolved cobalt.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein the magnetically separated cobalt is dissolved by hydrobromic acid.
References Cited (Backward Citations)
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Cited
US3673154A
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US3880920A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |