Patent US4528167A successfully refreshed from Google Patents.
US4528167A
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Selective solvent extraction using organophosphorus and carboxylic acids and a non-chelating aldehyde oxime
Assignee: Council for Mineral Technology
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Filing: 1983-08-15
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Granted: 1985-07-09
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Expires: 2003-08-15
Abstract
Abstract A process for the extraction of metal values, in particular divalent metal ions such as copper, nickel, zinc, cobalt and manganese from aqueous solutions thereof which may be well in the acid range for example of pH 2 to 4. Extraction is effected using known organophosphorus or carboxylic acid extractants but in combination with non-chelating oximes, preferably of aldehydes wherein the alpha-carbon atom is primary or secondary. A synergistic effect between the extractant and oxime enables extraction to take place at a lower pH than heretofore thereby saving in acid and neutralizing agents in many instances.
Inventors
- 👤 John S. Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:15
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/40; C22B3/402; C22B3/404; C01G45/00; C01G45/01; C01G51/00; C01G51/01; C01G53/00; C01G53/01; C01G9/00; C01G9/003; C22B3/409; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A process for the solvent extraction of nickel, selectively from cobalt from solutions containing such metals and having a pH of less than 5 comprising contacting said solution with a solvent extractant comprising an organophosphorus acid or a carboxylic acid capable of extracting the nickel and a non-chelating oxime of an aldehyde wherein the alpha carbon atom is primary or secondary.
Claim 2
Dependent Claim
61 words
A process for the solvent extraction of nickel, selectively from cobalt from solutions containing such metals and having a pH of less than 5 comprising contacting said solution with a solvent extractant comprising an organophosphorus acid or a carboxylic acid capable of extracting the nickel and a non-chelating oxime of an aldehyde wherein the alpha carbon atom is primary or secondary.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which the extraction is carried out at a pH of less than 4.
Claim 4
Dependent Claim
33 words
The process of claim 1 in which the organophosphorus acid has the formula (RO) 2 PO--OH wherein each R is, independently of the other, a substituted or unsubstituted alkyl, aryl or alkaryl group.
Claim 5
Dependent Claim
47 words
The process of claim 1 in which the non-chelating oxime has the formula: ##STR2## wherein R is selected from the group consisting of C 7 H 15 ; C 4 H 9 CH(C 2 H 5 ); and C 2 H 5 CH(C 2 H 5 ).
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the non-chelating oxime is 2-ethylhexanal oxime.
Claim 7
Dependent Claim
12 words
The process of claim 4 wherein the non-chelating oxime is caprylaldehyde oxime.
Claim 8
Dependent Claim
89 words
A process for the solvent extraction of nickel selectively from cobalt from solutions containing such metals and having a pH of less than 4 comprising contacting said solution with a solvent extractant comprising an organophosphorus acid or a carboxylic acid capable of extracting the nickel and a non-chelating oxime of an aldehyde having the formula: ##STR3## wherein R is selected from the group consisting of C 7 H 15 ; C 4 H 9 CH(C 2 H 5 ); and C 2 H 5 CH(C 2 H 5 ).
Claim 9
Dependent Claim
89 words
A process for the solvent extraction of nickel selectively from cobalt from solutions containing such metals and having a pH of less than 4 comprising contacting said solution with a solvent extractant comprising an organophosphorus acid or a carboxylic acid capable of extracting the nickel and a non-chelating oxime of an aldehyde having the formula: ##STR3## wherein R is selected from the group consisting of C 7 H 15 ; C 4 H 9 CH(C 2 H 5 ); and C 2 H 5 CH(C 2 H 5 ).
Claim 10
Dependent Claim
11 words
The process of claim 7 wherein the oxime is 2-ethylhexanal oxime.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |