US4272288A
Expired / Lapsed
US
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Concentration, separation and recovery of precious metals
Assignee: Mobil Oil AS
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Filing: 1979-10-01
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Granted: 1981-06-09
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Expires: 1999-10-01
Abstract
Abstract A process is provided for the concentration, separation and/or recovery of precious metals such as platinum and palladium via their soluble amine complexes from solutions by sorbing said complexes in one or more members of a novel class of zeolites. Said novel class of zeolites is characterized by a silica to alumina mole ratio of at least 12 and a constraint index in the approximate range of greater than about 2 to about 12.
Inventors
- 👤 Ralph M. Dessau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:03
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
106 words
A process for the separation and recovery of precious metals selected from platinum and palladium, which process comprises the steps of: (a) forming a solution of an ammine complex of a precious metal selected from platinum and palladium; (b) contacting said solution with one or more members of a novel class of zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index within the approximate range of greater than about 2 to about 12, to selectively sorb said ammine complex; (c) desorbing said precious metal from said zeolite by ion-exchange with a cation; and (d) recovering said precious metal.
Claim 2
Dependent Claim
106 words
A process for the separation and recovery of precious metals selected from platinum and palladium, which process comprises the steps of: (a) forming a solution of an ammine complex of a precious metal selected from platinum and palladium; (b) contacting said solution with one or more members of a novel class of zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index within the approximate range of greater than about 2 to about 12, to selectively sorb said ammine complex; (c) desorbing said precious metal from said zeolite by ion-exchange with a cation; and (d) recovering said precious metal.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein said member of the novel class of zeolites is selected from the group consisting of ZSM-5, ZSM-11, ZSM-23 and ZSM-35.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein said member of the novel class of zeolites is ZSM-5.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein said zeolite is Na-ZSM-5.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said zeolite is in the sodium form.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said ammine complex is Pt(NH 3 ) 4 +2 .
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said ammine complex is Pd(NH 3 ) 4 +2 .
Claim 9
Dependent Claim
31 words
The process of claim 1 wherein forming a solution of said ammine complex comprises dissolving said precious metal in an acid and then adding an amine until the solution becomes basic.
Claim 10
Dependent Claim
11 words
The process of claim 8 wherein the added amine is ammonia.
Claim 11
Dependent Claim
11 words
The process of claim 8 wherein said acid is aqua regia.
Claim 12
Dependent Claim
16 words
The process of claim 1 wherein said solution of an ammine complex is an aqueous solution.
Claim 13
Dependent Claim
25 words
The process of claim 1 wherein forming a solution of said ammine complex comprises contacting a salt of said precious metal with an amine solution.
Claim 14
Dependent Claim
13 words
The process of claim 12 wherein said amine solution is ammonium hydroxide solution.
Claim 15
Dependent Claim
18 words
The process of claim 1 wherein said cation used in desorbing the precious metal is an ammonium ion.
Claim 16
Dependent Claim
18 words
The process of claim 1 wherein said cation used in desorbing the precious metal is a alkylammonium ion.
Claim 17
Dependent Claim
11 words
The process of claim 1 wherein said cation is tetramethylammonium ion.
Claim 18
Dependent Claim
17 words
The process of claim 1 wherein recovering said precious metal is achieved by treatment with reducing agents.
Claim 19
Dependent Claim
15 words
The process of claim 1 wherein recovering said precious metal is achieved by thermal decomposition.
Claim 20
Dependent Claim
15 words
The process of claim 1 wherein said zeolite is regenerated after said desorbing by calcination.
Claim 21
Dependent Claim
20 words
The process of claim 19 wherein said zeolite is further regenerated after said desorbing by base exchange following said calcination.
Claim 22
Dependent Claim
24 words
The process of claim 1 wherein said precious metals are separated from other metals selected from the group consisting of rhodium, iridium and cobalt.
Claim 23
Dependent Claim
14 words
The process of claim 1 wherein said precious metals are recovered from catalytic mufflers.
Claim 24
Dependent Claim
14 words
The process of claim 1 wherein said precious metals are recovered from spent catalysts.
Claim 25
Dependent Claim
69 words
A process for the selective concentration and/or separation of precious metals selected from platinum and palladium, which process comprises contacting a solution of an ammine complex of said precious metal with one or more members of a novel class of zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index within the approximate range of greater than about 2 to about 12.
Claim 26
Dependent Claim
69 words
A process for the selective concentration and/or separation of precious metals selected from platinum and palladium, which process comprises contacting a solution of an ammine complex of said precious metal with one or more members of a novel class of zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index within the approximate range of greater than about 2 to about 12.
Claim 27
Dependent Claim
26 words
The process of claim 24 wherein said member of the novel class of zeolites is selected from the group consisting of ZSM-5, ZSM-11, ZSM-23 and ZSM-35.
Claim 28
Dependent Claim
16 words
The process of claim 25 wherein said member of the novel class of zeolites is ZSM-5.
Claim 29
Dependent Claim
13 words
The process of claim 26 wherein said zeolite is in the sodium form.
Claim 30
Dependent Claim
10 words
The process of claim 26 wherein said zeolite is Na-ZSM-5.
Claim 31
Dependent Claim
16 words
The process of claim 24 wherein said ammine complex is Pt(NH 3 ) 4 +2 .
Claim 32
Dependent Claim
16 words
The process of claim 24 wherein said ammine complex is Pd(NH 3 ) 4 +2 .
Claim 33
Dependent Claim
32 words
The process of claim 24 wherein said ammine complex is formed by treating a precious metal containing material in an acid and then adding an amine solution until the solution becomes basic.
Claim 34
Dependent Claim
13 words
The process of claim 31 wherein said amine solution is ammonium hydroxide solution.
Claim 35
Dependent Claim
11 words
The process of claim 31 wherein said acid is aqua regia.
Claim 36
Dependent Claim
16 words
The process of claim 24 wherein said solution of an ammine complex is an aqueous solution.
Claim 37
Dependent Claim
23 words
The process of claim 24 wherein said ammine complex is formed by contacting a salt of said precious metal with an amine solution.
Claim 38
Dependent Claim
13 words
The process of claim 35 wherein said amine solution is ammonium hydroxide solution.
Claim 39
Dependent Claim
24 words
The process of claim 24 wherein said precious metals are separated from other metals selected from the group consisting of rhodium, iridium and cobalt.
References Cited (Backward Citations)
US2397575A
Cited
US2653089A
Cited
US3473921A
Cited
US3702886A
Cited
US3709979A
Cited
US3920449A
Cited
US4016245A
Cited
US4069040A
Cited
US3999983A
Cited
US4076842A
Cited
US4130506A
Cited
US4002575A
Cited
US4072508A
Cited
US4077800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |