US3820979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of metals
Assignee: Yeda Research and Development Co Ltd
•
Filing: 1972-01-07
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Granted: 1974-06-28
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Expires: 1992-01-07
Abstract
Abstract A process for the production of metallic metals selected from the group consisting of copper, silver and mercury, which comprises contacting an aqueous solution of the metal compound with a solution of a reduced quinonic compound, preferably an anthraquinone compound, in an organic solvent which is substantially insoluble in and immiscible with water, resulting in the precipitation of the metallic compound which is recovered. The organic phase may be separated, the quinonic compound may be reduced and used again for treating subsequent batches of metal salts.
Inventors
- 👤 J Manassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:31
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/003; C01G13/00; C01G13/003; C01G5/00; C01G5/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B43/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The process of claim 1 wherein said 2-(lower alkyl)-anthraquinone is selected from the group consisting of 2-methyl-anthraquinone, 2-ethyl-anthraquinone, 2-propylanthraquinone and 2-tert-butyl-anthraquinone.
Claim 2
Dependent Claim
20 words
The process of claim 1 wherein said organic solvent is a mixture of an aromatic solvent and a polar solvent.
Claim 3
Dependent Claim
19 words
The process of claim 3 wherein said aromatic solvent is xylene or toluene and said polar solvent is 2-ethylhexanol.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the metal is copper and said metal salt is copper sulfate or copper acetate.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said metal is copper and wherein said aqueous solution additionally contains water soluble salts of nickel, cobalt or iron.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein the precipitation is effected by contacting the aqueous solution with a number of batches of the reduce anthraquinone solution, one after the other.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein after precipitation of the metal, the organic phase is separated, the anthraquinone compound therein is reduced and the resulting solution is used to repeat the process of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |