EP0057797A2
Expired / Lapsed
EP
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Process for the extraction of metal values and novel metal extractants
Assignee: Syngenta Ltd
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Filing: 1981-12-23
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Granted: —
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Expires: 2001-12-23
Abstract
Abstract Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent -(COX) A where X is the group-OR, or -NR 2 R 3 and n is 1,2 or 3. R, is a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 are hydrogen or a hydrocarbyl group wherein R 2 and R 3 together contain from 5 to 36 carbon atoms. The process is especially useful for the recovery of metals from leach solutions derived from sulphur-containing ores such as chalcopyrite.
Inventors
- 👤 Raymond Frederick Dalton
- 👤 Raymond Price
- 👤 Peter Michael Quan
- 👤 David Stewart
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 03:37
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/80; C07D213/81; C07D213/82; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/36; C22B3/362; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A process for extracting metal values from aqueous solutions of metal salts containing halide or pseudo halide anion which comprises contacting the aqueous solution with a solution in a water-immiscible organic solvent of a substituted pyridine of formula: wherein X is the group -OR1 or -NR 2 R 3 , R 1 being a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 being hydrogen or a hydrocarbyl group, R 2 and R 3 together containing from 5 to 36 carbon atoms, and n is 1, 2 or 3.
Claim 2
Dependent Claim
95 words
A process for extracting metal values from aqueous solutions of metal salts containing halide or pseudo halide anion which comprises contacting the aqueous solution with a solution in a water-immiscible organic solvent of a substituted pyridine of formula: wherein X is the group -OR1 or -NR 2 R 3 , R 1 being a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 being hydrogen or a hydrocarbyl group, R 2 and R 3 together containing from 5 to 36 carbon atoms, and n is 1, 2 or 3.
Claim 3
Dependent Claim
89 words
A process for extracting metal values from aqueous solutions of metal salts containing halide or pseudo halide anion which comprises contacting the aqueous solution with a solution in a water-immiscible organic solvent of a 3-or 4-substituted pyridine of formula: wherein X is the group -OR1 or -NR 2 R 3 , R 1 being a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 being hydrogen or a hydrocarbyl group, R 2 and R 3 together containing from 5 to 20 carbon atoms.
Claim 4
Dependent Claim
89 words
A process for extracting metal values from aqueous solutions of metal salts containing halide or pseudo halide anion which comprises contacting the aqueous solution with a solution in a water-immiscible organic solvent of a 3-or 4-substituted pyridine of formula: wherein X is the group -OR1 or -NR 2 R 3 , R 1 being a hydrocarbyl group containing from 5 to 36 carbon atoms and R 2 and R 3 being hydrogen or a hydrocarbyl group, R 2 and R 3 together containing from 5 to 20 carbon atoms.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein n is 1 and R 1 is a branched chain alkyl group containing from 9 to 24 carbon atoms.
Claim 6
Dependent Claim
39 words
A process according to claim 1 wherein n is 1, 2 or 3 and R 1 is the group wherein R 4 and R 5 are alkyl groups, and R4 contains two fewer carbon atoms than R 5 .
Claim 7
Dependent Claim
26 words
A process according to claim 1 wherein n is 1, and R 1 is selected from the group consisting of tridecyl, 2-hexyl decyl, isohexadecyl and 2-octyldecyl.
Claim 8
Dependent Claim
27 words
A process according to claim 1 wherein n is 2 and the two groups R 1 together contain a total of from 16 to 36 carbon atoms.
Claim 9
Dependent Claim
22 words
A process according to claim 6 wherein the two respective groups R 1 are the same and contain a mixture of isomers.
Claim 10
Dependent Claim
47 words
A process according to claim 1 wherein n is 1 and R 2 and R 3 are alkyl groups which taken together contain a total of from 15 to 36 carbon atoms, provided that when R 2 is hydrogen, R 3 is a branched chain alkyl group.
Claim 11
Dependent Claim
35 words
A process according to claim 1 wherein n is 2 and the respective groups R 2 and R 3 are alkyl groups and the total number of alkyl carbon atoms is from 20 to 70.
Claim 12
Dependent Claim
44 words
A process according to claim 1 wherein n is 2, and the two respective groups R 1 are the same and are selected from the group consisting of mixed isomer isodecyl, single isomer nonyl, mixed isomer nonyl, 2-ethylhexyl, mixed isomer octyl, di-isobutylcarbinyl and tridecyl.
Claim 13
Dependent Claim
105 words
A process according to any of the preceding claims wherein (a) the aqueous solution is separated from the solution in the water-immiscible solvent of the substituted pyridine into which the metal has been extracted in the form of a halide (or pseudo halide) containing complex of the metal with the substituted pyridine, and (b) the resultant organic phase is contacted with an aqueous strip solution which is water, or which contains a reduced concentration of halide (or pseudo halide) ion whereby the halide (or pseudo halide) containing complex of copper with the substituted pyridine is unstable and the metal transfers into the aqueous strip solution.
Claim 14
Dependent Claim
92 words
A 3- or 4-substituted pyridine of formula: wherein X is the group -OR or -NR 2 R 3 , R 1 being an alkyl group containing from 9 to 24 carbon atoms and having the formula: wherein R 4 and R 5 are alkyl groups, and R 4 contains two fewer carbon atoms than R 5 , and R 2 and R 3 together being alkyl groups containing a total of from 15 to 36 carbon atoms, proviced that when R 2 is hydrogen, R 3 is a branched chain alkyl group.
Claim 15
Dependent Claim
92 words
A 3- or 4-substituted pyridine of formula: wherein X is the group -OR or -NR 2 R 3 , R 1 being an alkyl group containing from 9 to 24 carbon atoms and having the formula: wherein R 4 and R 5 are alkyl groups, and R 4 contains two fewer carbon atoms than R 5 , and R 2 and R 3 together being alkyl groups containing a total of from 15 to 36 carbon atoms, proviced that when R 2 is hydrogen, R 3 is a branched chain alkyl group.
Claim 16
Dependent Claim
78 words
A substituted pyridine of formula: wherein X is the group -OR 1 or -NR 2 R 3 , and n is 2 or 3, the respective groups R 1 being alkyl groups containing a total of from 16 to 36 carbon atoms, and the respective groups R 2 and R 3 being alkyl groups wherein the total number of alkyl carbon atoms contained in all the respective groups R 2 and R 3 is from 20 to 70.
Claim 17
Dependent Claim
78 words
A substituted pyridine of formula: wherein X is the group -OR 1 or -NR 2 R 3 , and n is 2 or 3, the respective groups R 1 being alkyl groups containing a total of from 16 to 36 carbon atoms, and the respective groups R 2 and R 3 being alkyl groups wherein the total number of alkyl carbon atoms contained in all the respective groups R 2 and R 3 is from 20 to 70.
Claim 18
Dependent Claim
47 words
A substituted pyridine according to claim 13 wherein n is 2 and the two respective groups R 1 are the same and are selected from the group consisting of mixed isomer isodecyl, single isomer nonyl, mixed isomer nonyl, 2-ethylhexyl, mixed isomer octyl, di-isobutylcarbinyl and mixed isomer tridecyl.
References Cited (Backward Citations)
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