US4438080A
Expired / Lapsed
US
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Process for oxidizing thallium (I) to thallium (III)
Assignee: FMC Corp
•
Filing: 1982-12-06
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Granted: 1984-03-20
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Expires: 2002-12-06
Abstract
Abstract A process was developed to optimize the thallium (III) produced by the reaction of hydrogen peroxide and thallium (I). In the optimized process, thallium (III) is removed from the reaction mixture during the oxidation reaction.
Inventors
- 👤 Bruce K. McEuen
- 👤 Robert D. Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:14
CPC Classifications
C; C01; C01G; C01G15/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
44 words
In the process for oxidizing ions of thallium (I) contained in a reaction solution to thallium (III) using hydrogen peroxide as the oxidizing agent wherein the improvement comprises removing at least part of the thallium (III) from the reaction solution during the oxidation process.
Claim 2
Dependent Claim
44 words
In the process for oxidizing ions of thallium (I) contained in a reaction solution to thallium (III) using hydrogen peroxide as the oxidizing agent wherein the improvement comprises removing at least part of the thallium (III) from the reaction solution during the oxidation process.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein thallium (III) is removed by reacting the thallium (III) with a compound capable of reducing the thallium (III) to thallium (I).
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein the compound capable of reducing the thallium (III) is an olefin, an acetylene, a ketone, or an aldehyde.
Claim 5
Dependent Claim
39 words
The process of claim 1 wherein the pH of the reaction solution is greater than 7 and the thallium (III) is removed by separating thallium (III) from the reaction solution by filtering or centrifuging it as thallium (III) oxide.
Claim 6
Dependent Claim
32 words
The process of claim 1 wherein the pH of the reaction solution is 7 or less and the thallium (III) ion is removed from the reaction solution by extracting with a solvent.
Claim 7
Dependent Claim
34 words
The process of claim 1 wherein the pH of the reaction solution is 7 or less and the thallium (III) ion is removed from the reaction solution by use of an ion exchange resin.
Claim 8
Dependent Claim
42 words
The process of claim 1 wherein the pH of the reaction solution is 7 or less and the thallium (III) ion is removed from the reaction solution by reacting the thallium (III) with an aromatic compound to form a thallium (III) compound.
Claim 9
Dependent Claim
24 words
The process of claim 7 wherein the reaction solution contains trifluoroacetic acid as a solvent and the arylthallium (III) compound is arylthallium (III) ditrifluoroacetate.
Claim 10
Dependent Claim
42 words
The process of claim 1 wherein the pH of the reaction solution is 7 or less and the thallium (III) ion is removed from the reaction solution by reacting the thallium (III) with an olefin, an acetylene, a ketone, or an aldehyde.
References Cited (Backward Citations)
US4169809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |