US4331520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of hydrogen-reduced metals, ions and the like at porous hydrophobic catalytic barriers
Assignee: WALTER JUDA AND/OR WALTER JUDA ASSOCIATES
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Filing: 1979-10-26
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Granted: 1982-05-25
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Expires: 1999-10-26
Abstract
Abstract This disclosure concerns primarily the recovery of hydrogen-reduced metals from aqueous solutions of salts thereof, by hydrogen reduction at a porous hydrophobic catalytic barrier, at ordinary temperatures, in an apparatus provided with means to supply hydrogen to one face and aqueous solution to the other face of said barrier.
Inventors
- 👤 Walter Juda
- 👤 Robert J. Allen
- 👤 Robert Lindstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:36
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C22B15/0093; C22B3/00; C22B3/20; C22B3/44; C22B43/00; C22B47/00; C22B5/00; C22B5/02; C22B5/12; C25; C25C; C25C1/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S204/00; Y10S204/03
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
54 words
A process for recovering hydrogen-reduced metals or ions from an aqueous solution of an ionized salt thereof, that comprises, providing a porous hydrophobic catalytic barrier, contacting one surface of the barrier with said solution, and applying hydrogen gas to the other surface, thereby to produce the hydrogen-reduced mtals or ions at said one surface.
Claim 2
Dependent Claim
54 words
A process for recovering hydrogen-reduced metals or ions from an aqueous solution of an ionized salt thereof, that comprises, providing a porous hydrophobic catalytic barrier, contacting one surface of the barrier with said solution, and applying hydrogen gas to the other surface, thereby to produce the hydrogen-reduced mtals or ions at said one surface.
Claim 3
Dependent Claim
33 words
A process as claimed in claim 1 and in which the solution is an ionized salt of said metal and the hydrogen-reduced metal is deposited on the said one surface of the barrier.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 2 and in which the said metal is selected from the group consisting of copper, silver, gold and the platinum metals.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 2 and in which said metal is copper and said solution contains copper ions in amount less than about 5 grams/liter of the solution.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 2 and in which the deposited metal is removed from the barrier by mechanical stripping.
Claim 7
Dependent Claim
36 words
A process as claimed in claim 2 and in which the deposited metal is removed from the barrier by dissolving the deposited metal to produce a concentrated solution of the metal and electrowinning the metal therefrom.
Claim 8
Dependent Claim
42 words
A process as claimed in claim 2 and in which the barrier is an electrode and the deposited metal is removed from said barrier by redissolving the deposited metal into an electrorefining electrolyte and electroplated therefrom using the barrier as an anode.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 2 and in which the deposited metal is removed from said barrier by incinerating the same.
Claim 10
Dependent Claim
37 words
A process as claimed in claim 2 and in which the deposited metal is removed from said barrier by contacting the deposited metal with an electrolyte solution and the said other barrier surface with air or oxygen.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein said solution comprises a partially hydrogen-reducible ion.
Claim 12
Dependent Claim
22 words
The process of claim 10 wherein said partially hydrogen-reducible ion is selected from the group consisting of ferric, mercuric and permanganate ions.
Claim 13
Dependent Claim
36 words
The process of claim 1 wherein said catalytic barrier is formed by uniformly depositing on and adhering to a porous substrate a substantially uniform mixture of particles of a wet-proofing agent and catalytic noble metal particles.
Claim 14
Dependent Claim
20 words
The process of claim 12 wherein said noble metal is platinum and said wet-proofing agent is a fluorinated hydrocarbon polymer.
Claim 15
Dependent Claim
21 words
The process of claim 12 wherein said platinum is present in amount between 0.04 and 1.0 gram/sq. ft. of said barrier.
Claim 16
Dependent Claim
12 words
The process of claim 12 wherein said porous substrate is electrically conducting.
Claim 17
Dependent Claim
12 words
The process of claim 15 and in which the barrier is circuitry-free.
Claim 18
Dependent Claim
23 words
The process of claim 15 wherein said substrate is selected from the group of porous carbon, carbon cloth, porous metal and metal screen.
Claim 19
Dependent Claim
12 words
The process of claim 12 wherein said substrate is of insulating material.
Claim 20
Dependent Claim
16 words
The process of claim 1 wherein said aqueous solution contacts said barrier under turbulent flow conditions.
Claim 21
Dependent Claim
14 words
The process of claim 1 wherein said hydrogen reduction is effected at ordinary temperature.
Claim 22
Dependent Claim
88 words
The process of claim 1 wherein said metal is copper, said copper having been deposited from a first solution containing a concentration of copper ions of less than 5 grams/liter of solution, and wherein the said other surface of the barrier is contacted by air or oxygen and the deposited copper on said one surface of the barrier is contacted by an electrolyte acid solution in amount to yield a second redissolved copper ion solution containing at least five times the copper ion concentration of said first solution.
Claim 23
Dependent Claim
19 words
The process of claim 21 and including the additional step of subjecting said second copper ion solution to electrowinning.
Claim 24
Dependent Claim
56 words
A process for recovering hydrogen-reduced metals or ions from an aqueous solution of an ionized salt thereof that comprises, providing in contact with the solution a porous hydrophobic catalytic barrier, and flowing hydrogen gas upon the catalytic barrier to reduce metals or ions from said solution at surface portions of the catalytic barrier contacting the solution.
Claim 25
Dependent Claim
56 words
A process for recovering hydrogen-reduced metals or ions from an aqueous solution of an ionized salt thereof that comprises, providing in contact with the solution a porous hydrophobic catalytic barrier, and flowing hydrogen gas upon the catalytic barrier to reduce metals or ions from said solution at surface portions of the catalytic barrier contacting the solution.
Claim 26
Dependent Claim
22 words
A process as claimed in claim 1 or 23, further comprising agitating the solution to cause turbulent flow thereof onto the barrier.
Claim 27
Dependent Claim
21 words
A process as claimed in claim 1 or 23, further comprising directing the solution onto the barrier under rapid flow conditions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |