US4003975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of copper values using dihydroxy azoarenes
Assignee: Union Carbide Corp
•
Filing: 1975-12-08
•
Granted: 1977-01-18
•
Expires: 1995-12-08
Abstract
Abstract Copper values are extracted from aqueous solution by dihydroxy azoarenes dissolved in a water immiscible organic solvent.
Inventors
- 👤 John Frank Tancredi
- 👤 Patrick Bernard Sullivan
- 👤 Glenn Franklin Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:21
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/284; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
In a process for the recovery of copper values from an aqueous solution of copper and iron values, wherein said aqueous solution is contacted with an immiscible solution of an extracting agent in an organic solvent and the resultant mixture is separated into a barren aqueous phase and a pregnant organic phase and copper values are subsequently recovered from the organic phase by treatment with an aqueous acid solution, the improvement which comprises utilizing as the extracting agent 2,2'-dihydroxy azoarenes having the formula: Ar - N = N - Ar' wherein Ar and Ar' are each selected from the group consisting of ##STR9##wherein each of R, R' and R" is a monovalent radical selected from the group consisting of hydrogen and alkyl groups having 1-20 carbon atoms.
Claim 2
Dependent Claim
127 words
In a process for the recovery of copper values from an aqueous solution of copper and iron values, wherein said aqueous solution is contacted with an immiscible solution of an extracting agent in an organic solvent and the resultant mixture is separated into a barren aqueous phase and a pregnant organic phase and copper values are subsequently recovered from the organic phase by treatment with an aqueous acid solution, the improvement which comprises utilizing as the extracting agent 2,2'-dihydroxy azoarenes having the formula: Ar - N = N - Ar' wherein Ar and Ar' are each selected from the group consisting of ##STR9##wherein each of R, R' and R" is a monovalent radical selected from the group consisting of hydrogen and alkyl groups having 1-20 carbon atoms.
Claim 3
Dependent Claim
12 words
Process claimed in claim 1 wherein both Ar and Ar' are ##STR10##
Claim 4
Dependent Claim
14 words
Process claimed in claim 2 wherein R is hydrogen in both Ar and Ar'.
Claim 5
Dependent Claim
15 words
Process claimed in claim 2 wherein R is methyl in Ar and hydrogen in Ar'.
Claim 6
Dependent Claim
14 words
Process claimed in claim 4 wherein R is in the 5 position of Ar.
Claim 7
Dependent Claim
15 words
Process claimed in claim 2 wherein R is ethyl in Ar and hydrogen in Ar'.
Claim 8
Dependent Claim
15 words
Process claimed in claim 2 wherein R is isopropyl in Ar and hydrogen in Ar'.
Claim 9
Dependent Claim
14 words
Process claimed in claim 2 wherein R is isobutyl in both Ar and Ar'.
Claim 10
Dependent Claim
19 words
Process claimed in claim 2 wherein R is in the 5 and 5' positions of Ar and Ar', respectively.
Claim 11
Dependent Claim
14 words
Process claimed in claim 1 wherein R is isopropyl in both Ar and Ar'.
Claim 12
Dependent Claim
18 words
Process claimed in claim 1 wherein the pH of the aqueous solution is about 2 to about 3.
Claim 13
Dependent Claim
12 words
Process claimed in claim 1 wherein Ar and Ar' are both ##STR11##
Claim 14
Dependent Claim
12 words
Process claimed in claim 1 wherein Ar and Ar' are both ##STR12##
References Cited (Backward Citations)
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US2549922A
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US2891047A
Cited
US3558288A
Cited
US3546202A
Cited
US3655347A
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |