US4196076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of cobalt and nickel by solvent extraction
Assignee: Daihachi Chemical Industry Co Ltd
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Filing: 1978-05-15
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Granted: 1980-04-01
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Expires: 1998-05-15
Abstract
Abstract This invention concerns the method of separation of Co from Ni in an aqueous solution containing Co from Ni salts, with an organic solvent containing 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and/or 3,5,5-trimethylhexyl phosphonic acid mono-3,5,5-trimethylhexyl ester and/or isodecyl phosphonic acid monoisodecyl ester as an effective extractant for the separation of Co from Ni, the method which requires fewer stages in the solvent extraction equipment and less organic solvent than the conventional method, and which can very effectively separate Co from Ni in high purity and in high yield. The continuous separation of Co from Ni according to this invention enables the separation of Co with purity above 99% in a yield above 99% and Ni with purity above 99% in a yield above 99%.
Inventors
- 👤 Akihiro Fujimoto
- 👤 Isami Miura
- 👤 Kazuo Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/01; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/384; C22B3/3844; C22B3/40; C22B3/408; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
A process for separating cobalt from nickel in an aqueous solution containing the above-mentioned metals, with consists essentially of (A) contacting the said solution with an organic extraction solvent comprising a mono-alkyl alkylphosphonic acid as extractant and having the general formula: ##STR2## wherein R represents 2-ethylhexyl, 3,5,5-trimethylhexyl, or isodecyl, whereby cobalt is extracted from the aqueous solution into the organic phase, and (B) subsequently separating the resultant cobalt loaded organic phase from the aqueous phase.
Claim 2
Dependent Claim
75 words
A process for separating cobalt from nickel in an aqueous solution containing the above-mentioned metals, with consists essentially of (A) contacting the said solution with an organic extraction solvent comprising a mono-alkyl alkylphosphonic acid as extractant and having the general formula: ##STR2## wherein R represents 2-ethylhexyl, 3,5,5-trimethylhexyl, or isodecyl, whereby cobalt is extracted from the aqueous solution into the organic phase, and (B) subsequently separating the resultant cobalt loaded organic phase from the aqueous phase.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the said extractant is mono-2-ethylhexyl 2-ethylhexylphosphonic acid, mono-3,5,5-trimethylhexyl, 3,5,5-trimethylhexylphosphonic acid, or monoisodecyl isodecylphosphonic acid, or mixtures thereof.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the extraction is performed within the pH range of from about 5 to 6.5.
Claim 5
Dependent Claim
26 words
The process of claims 1 or 2 wherein the organic extraction solvent comprises the said extractant in an amount of from 5 to 100% by volume.
Claim 6
Dependent Claim
26 words
The process of claims 1 or 2 wherein the organic extraction solvent comprises the said extractant in an amount of from 10 to 40% by volume.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein the said extractant further comprises an aliphatic hydrocarbon, aromatic hydrocarbon, or mixtures thereof.
Claim 8
Dependent Claim
16 words
The process of claims 1 to 3 wherein the organic extraction solvent contains an emulsion inhibitor.
Claim 9
Dependent Claim
16 words
The process of claims 1 to 3 wherein the emulsion inhibitor is tributyl phosphate or isodecanol.
Claim 10
Dependent Claim
30 words
The process of claims 1 to 3 wherein said cobalt loaded organic phase is scrubbed by contact with (a) diluted inorganic acid or (b) an aqueous solution containing cobalt salt.
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) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |