US4599153A
Expired / Lapsed
US
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Selective extraction of rhenium from aqueous sulfuric acid solutions
Assignee: Wyeth Holdings LLC
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Filing: 1983-01-13
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Granted: 1986-07-08
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Expires: 2003-01-13
Abstract
Abstract The present invention relates to the selective extraction of rhenium metal from aqueous sulfuric acid solutions. More particularly, it relates to the selective extraction of rhenium metal from sulfuric acid leach solutions, resulting from the leaching of spent petroleum reforming catalysts, by the use of tertiary phosphine oxide extraction compounds.
Inventors
- 👤 John H. Bright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
C; C01; C01G; C01G47/00; C01G47/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/40; C22B3/408; C22B3/22; C22B3/24; C22B3/38; C22B3/382; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A process for the selective extraction of rhenium from aqueous sulfuric acid solutions having a pH in the range of from about - 0.5 to about 3.0, said process consisting essentially of: (1) contacting said aqueous sulfuric acid solution with a tertiary phosphine oxide extractant compound having the structure: ##STR2## wherein R 1 , R 2 and R 3 are each, independently, selected from the group consisting of alkyl of 6 to 20 carbon atoms, cycloalkyl, aryl, aralkyl, alkyl-substituted aryl and alkyl-substituted arallyl; (2) separating the resulting phosphine oxide-rhenium complex from said aqueous solution; and (3) recovering the rhenium from said complex.
Claim 2
Dependent Claim
102 words
A process for the selective extraction of rhenium from aqueous sulfuric acid solutions having a pH in the range of from about - 0.5 to about 3.0, said process consisting essentially of: (1) contacting said aqueous sulfuric acid solution with a tertiary phosphine oxide extractant compound having the structure: ##STR2## wherein R 1 , R 2 and R 3 are each, independently, selected from the group consisting of alkyl of 6 to 20 carbon atoms, cycloalkyl, aryl, aralkyl, alkyl-substituted aryl and alkyl-substituted arallyl; (2) separating the resulting phosphine oxide-rhenium complex from said aqueous solution; and (3) recovering the rhenium from said complex.
Claim 3
Dependent Claim
20 words
A process in accordance with claim 1 wherein said tertiary phosphine oxide compound is dissolved in a water-immiscible hydrocarbon solvent.
Claim 4
Dependent Claim
19 words
A process in accordance with claim 2 wherein said hydrocarbon solvent is an aromatic or aliphatic petroleum distillate composition.
Claim 5
Dependent Claim
16 words
A process in accordance with claim 1 wherein said tertiary phosphine oxide compound is tri-n-octylphosphine oxide.
Claim 6
Dependent Claim
23 words
A process in accordance with claim 1 wherein said tertiary phosphine oxide compound is absorbed on or encapsulated in an inert support material.
Claim 7
Dependent Claim
16 words
A process in accordance with claim 5 wherein said inert support material is a styrene-divinylbenzene copolymer.
Claim 8
Dependent Claim
136 words
A process for the selective extraction of rhenium from aqueous sulfuric acid solutions having a pH in the range of from about -0.5 to about 3.0, said process consisting essentially of: (a) contacting said aqueous sulfuric acid solution with a tertiary phosphine oxide extractant compound having the structure: ##STR3## wherein R 1 , R 2 and R 3 are each, independently, selected from the group consisting of C 6 -C 20 alkyl, cycloalkyl, aryl, aralkyl, alkyl-substituted aryl and alkyl-substituted aralkyl; (b) separating the resulting phosphine oxide-rhenium complex from said aqueous acid solution; (c) contacting the phosphine oxide-rhenium complex with an aqueous solution of an ammonium salt, whereby the rhenium is stripped from the complex and reports to the aqueous ammonium salt solution; and (d) thereafter, recovering the rhenium from said aqueous ammonium solution by electrowinning methods.
Claim 9
Dependent Claim
136 words
A process for the selective extraction of rhenium from aqueous sulfuric acid solutions having a pH in the range of from about -0.5 to about 3.0, said process consisting essentially of: (a) contacting said aqueous sulfuric acid solution with a tertiary phosphine oxide extractant compound having the structure: ##STR3## wherein R 1 , R 2 and R 3 are each, independently, selected from the group consisting of C 6 -C 20 alkyl, cycloalkyl, aryl, aralkyl, alkyl-substituted aryl and alkyl-substituted aralkyl; (b) separating the resulting phosphine oxide-rhenium complex from said aqueous acid solution; (c) contacting the phosphine oxide-rhenium complex with an aqueous solution of an ammonium salt, whereby the rhenium is stripped from the complex and reports to the aqueous ammonium salt solution; and (d) thereafter, recovering the rhenium from said aqueous ammonium solution by electrowinning methods.
Claim 10
Dependent Claim
21 words
A process in accordance with claim 7 wherein said tertiary phosphine oxide-rhenium complex is in solution in a water-immiscible hydrocarbon solvent.
Claim 11
Dependent Claim
17 words
A process in accordance with claim 7 wherein said complex is absorbed on an inert support material.
Claim 12
Dependent Claim
15 words
A process in accordance with claim 9 wherein said support material is a styrene-divinylbenzene copolymer.
Claim 13
Dependent Claim
18 words
A process in accordance with claims 7, 8, 9 or 10 wherein said ammonium salt is ammonium sulfate.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |