US4009252A
Expired / Lapsed
US
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Process for preparing hydrogen peroxide
Assignee: Tokuyama Corp
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Filing: 1975-06-23
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Granted: 1977-02-22
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Expires: 1995-06-23
Abstract
Abstract A process for preparing hydrogen peroxide which comprises reacting hydrogen with oxygen in an aqueous medium containing a platinum-group catalyst, characterized in that the partial pressure of hydrogen and the partial pressure of oxygen in the gaseous phase of the reaction system are maintained at at least 0.5 atmosphere and at least 1.0 atmosphere respectively, and the platinum group catalyst is caused to be present in an amount, calculated as metal, of at least a minimum effective catalytic amount up to 30 mg per 100 ml. of said aqueous medium.
Inventors
- 👤 Yusuke Izumi
- 👤 Hidetaka Miyazaki
- 👤 Shin-ichi Kawahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; C; C01; C01B; C01B15/00; C01B15/01; C01B15/029
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A process for preparing hydrogen peroxide which comprises reacting hydrogen with oxygen in an aqueous medium containing a platinum-group catalyst, characterized in that the partial pressure of hydrogen and the partial pressure of oxygen in the gaseous phase of the reaction system are maintained at at least 0.5 atmosphere and at least 1.0 atmosphere respectively, and in that the ratio of the partial pressure of oxygen to that of hydrogen in the gaseous phase of the reaction system is maintained within the range of 1.5 to 20, and the platinum group catalyst is caused to be present in an amount, calculated as metal, of at least a minimum effective catalyst amount up to 30 mg per 100 ml. of said aqueous medium.
Claim 2
Dependent Claim
122 words
A process for preparing hydrogen peroxide which comprises reacting hydrogen with oxygen in an aqueous medium containing a platinum-group catalyst, characterized in that the partial pressure of hydrogen and the partial pressure of oxygen in the gaseous phase of the reaction system are maintained at at least 0.5 atmosphere and at least 1.0 atmosphere respectively, and in that the ratio of the partial pressure of oxygen to that of hydrogen in the gaseous phase of the reaction system is maintained within the range of 1.5 to 20, and the platinum group catalyst is caused to be present in an amount, calculated as metal, of at least a minimum effective catalyst amount up to 30 mg per 100 ml. of said aqueous medium.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said platinum-group catalyst is selected from the group consisting of palladium-catalysts, platinum-catalysts and ruthenium-catalysts.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said platinum-group catalyst is a palladium-catalyst.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein the amount of said platinum-group catalyst is 0.01 to 25 mg, calculated as metal, per 100 ml. of said aqueous medium.
Claim 6
Dependent Claim
27 words
The process of claim 4 wherein the amount of the platinum-group catalyst is 0.1 to 20 mg, calculated as metal, per 100 ml. of said aqueous medium.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said ratio is within the range of 2.0 to 15.
Claim 8
Dependent Claim
50 words
The process of claim 1 wherein the pH of said aqueous medium is adjusted to at least 4, then said platinum-group catalyst is added to the aqueous medium, and the pH of the aqueous medium is adjusted to less than 4 thereby to prepare an aqueous medium containing the catalyst.
Claim 9
Dependent Claim
43 words
The process of claim 1 wherein the concentration of oxygen dissolved in said aqueous medium is adjusted to not more than 1.0 ppm, and then said platinum-group catalyst is added to the aqueous medium thereby to form an aqueous medium containing the catalyst.
Claim 10
Dependent Claim
51 words
The process of claim 1 wherein hydrogen is introduced into said aqueous medium, and when the partial pressure of hydrogen in the gaseous phase of the reaction system reaches at least 0.03 atmosphere, the platinum-group catalyst is added to the aqueous medium thereby to form an aqueous medium containing the catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |