US4320102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stabilizing hydrogen peroxide solutions
Assignee: Air Products and Chemicals Inc
•
Filing: 1980-10-10
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Granted: 1982-03-16
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Expires: 2000-10-10
Abstract
Abstract A method of stabilizing aqueous hydrogen peroxide solutions against decomposition catalyzed by a combination of iron and copper consists of adding to the solution an amount of alkali metal meta- and pyrophosphates effective to prevent decomposition and adjusting the pH of the solution to 2-4.
Inventors
- 👤 Augustine I. Dalton, Jr.
- 👤 Jeffery V. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:23
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/037
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A method of stabilizing aqueous hydrogen peroxide solutions against decomposition catalyzed by a combination of iron and copper consisting of adding to the solution an amount of a combination of alkali metal meta- and pyrophosphates in ratios of 20:1 to 1:20 by weight effective to prevent decomposition and adjusting the pH of the solution to 2-4.
Claim 2
Independent Claim
56 words
A method of stabilizing aqueous hydrogen peroxide solutions against decomposition catalyzed by a combination of iron and copper consisting of adding to the solution an amount of a combination of alkali metal meta- and pyrophosphates in ratios of 20:1 to 1:20 by weight effective to prevent decomposition and adjusting the pH of the solution to 2-4.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein the alkali metal is sodium.
Claim 4
Dependent Claim
19 words
The method of claim 1, wherein the alkali metal metaphosphate is (NaPO 3 ) n and n is 3-4.
Claim 5
Dependent Claim
32 words
The method of claim 1, wherein the metaphosphate and pyrophosphate are in ratios of 10:1 to 1:10 by weight and the amount of metaphosphate and pyrophosphate in the solution is 50-500 ppm.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein the pH of the solution is adjusted to 2.5-3.5.
Claim 7
Dependent Claim
48 words
The method of claim 1, wherein sodium metaphosphate and pyrophosphate are in ratios of 1:10 to 10:1 by weight, the amount of metaphosphate and pyrophosphate in the solution is 50-500 ppm, sodium metaphosphate contains 3-4 NaPO 3 units and the pH of the solution is adjusted to 2.5-3.5.
Claim 8
Dependent Claim
64 words
An aqueous solution of hydrogen peroxide, free of added stannate, stabilized against decomposition induced by a combination of copper and iron, consisting essentially of up to 99% by volume of hydrogen peroxide and up to about 2000 ppm of a stabilizing combination of alkali metal meta- and pyrophosphates in ratios of 20:1 to 1:20 by weight, wherein the pH of the solution is 2-4.
Claim 9
Dependent Claim
64 words
An aqueous solution of hydrogen peroxide, free of added stannate, stabilized against decomposition induced by a combination of copper and iron, consisting essentially of up to 99% by volume of hydrogen peroxide and up to about 2000 ppm of a stabilizing combination of alkali metal meta- and pyrophosphates in ratios of 20:1 to 1:20 by weight, wherein the pH of the solution is 2-4.
Claim 10
Dependent Claim
50 words
The hydrogen peroxide solution of claim 7, wherein the stabilizing combination is sodium metaphosphate and pyrophosphate in ratios of 1:10 to 10:1, the amount of metaphosphate and pyrophosphate in the solution is 50-500 ppm, sodium metaphosphate contains 3-4 NaPO 3 units and the pH of the solution is at 2.5-3.5.
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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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |