US3920449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering noble metal
Assignee: Mitsubishi Chemical Corp
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Filing: 1974-08-14
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Granted: 1975-11-18
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Expires: 1994-08-14
Abstract
Abstract A process for recovering a Group VIII noble metal with a high yield from an organic solvent solution containing a soluble complex of the noble metal and an organophosphorus compound comprising burning the organic solvent solution in a combustion zone, introducing the combustion product immediately into the aqueous absorbing solution to catch in the aqueous solution the particles of the noble metal and phosphorus oxide formed in the combustion, and recovering the noble metal particles from the aqueous solution.
Inventors
- 👤 Takeru Onoda
- 👤 Yoshitoshi Tsunoda
- 👤 Takao Nomura
- 👤 Takehisa Nonaka
- 👤 Tetsuo Masuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:44
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C01G5/00; C01G5/003; C01G55/00; C01G55/001; C07; C07C; C07C45/00; C07C45/49; C07C45/50; C22; C22B; C22B11/00; C22B3/00; C22B3/20; C22B3/22; C22B3/24; C22B3/26; C22B3/38; C22B3/382; C22B3/383; C22B3/384; C22B3/3842; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A PROCESS FOR RECOVERING A GROUP VIII NOBLE METAL COMPRISING COMBUSTING AN ORGANIC SOLVENT SOLUTION CONTAINING A SOLUBLE COMPLEX OF THE GROUP VIII NOBEL METAL AND AT LEAST ONE ORGANAPHOSPHORUS COMPOUND IN AN OXYGEN-CONTAINING GAS, IMMEDIATELY INTRODUCING THE COMBUSTION PRODUCT INTO AN AQUEOUS ABSORBING SOLUTION TO CATCH IN SAID AQUEOUS SOLUTION OF GROUP VIII NOBLE METAL PARTICLES AND THE PHOSPHORUS OXIDE FORMED BY THE CMBUSTION, AND RECOVERING THE NOBEL METAL PARTICLES FROM SAID AQUEOUS SOLUTION,
Claim 2
Dependent Claim
75 words
A PROCESS FOR RECOVERING A GROUP VIII NOBLE METAL COMPRISING COMBUSTING AN ORGANIC SOLVENT SOLUTION CONTAINING A SOLUBLE COMPLEX OF THE GROUP VIII NOBEL METAL AND AT LEAST ONE ORGANAPHOSPHORUS COMPOUND IN AN OXYGEN-CONTAINING GAS, IMMEDIATELY INTRODUCING THE COMBUSTION PRODUCT INTO AN AQUEOUS ABSORBING SOLUTION TO CATCH IN SAID AQUEOUS SOLUTION OF GROUP VIII NOBLE METAL PARTICLES AND THE PHOSPHORUS OXIDE FORMED BY THE CMBUSTION, AND RECOVERING THE NOBEL METAL PARTICLES FROM SAID AQUEOUS SOLUTION,
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein said aqueous absorbing solution is an alkaline aqueous absorbing solution.
Claim 4
Dependent Claim
24 words
The process as claimed in claim 1, wherein said aqueous absorbing solution comprises an aqueous absorbing solution with a carbonaceous adsorbing agent suspended therein.
Claim 5
Dependent Claim
14 words
The process as claimed in claim 3, wherein said adsorbing agent is activated carbon.
Claim 6
Dependent Claim
17 words
The process as claimed in claim 1, wherein the combustion is sealed by the aqueous absorbing solution.
Claim 7
Dependent Claim
59 words
The process as claimed in claim 1, wherein said organic solvent solution containing the soluble complex of the Group VIII noble metal is a residue of a reaction mixture obtained in the hydroformylation of an olefin using a soluble complex containing rhodium and a tertiary phosphine as a catalyst from which the aldehyde formed has been removed by distillation.
Claim 8
Dependent Claim
18 words
The process as claimed in claim 1, wherein the combusting is at a temperature of about 1,000*to 1,500*C.
Claim 9
Dependent Claim
25 words
The process as claimed in claim 1, wherein the amount of oxygen is about 110 to 150% on a molar basis of the theoretical amount.
Claim 10
Dependent Claim
30 words
The process as claimed in claim 1, wherein the concentration of the noble metal in the organic solution is about 0.05 to 2% by weight, calculated as the noble metal.
Claim 11
Dependent Claim
27 words
The process as claimed in claim 1, wherein the concentration of the phosphorus in the organic solution is about 0.1 to 5% by weight, calculated as phosphorus.
References Cited (Backward Citations)
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |