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US4532068A
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Method for improving the initial activity of activated hydrazine
Assignee: VEB LEUNA-WERKE WALTER ULBIRCHT
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Filing: 1983-03-10
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Granted: 1985-07-30
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Expires: 2003-03-10
Abstract
Abstract The method for improving the initial activity of activated hydrazine is used as corrosion protection for reservoir drinking water and for the wet preservation of installation parts no longer in use. It is the object of the invention to increase the initial activity of hydrazine solutions, activated with complexes of trivalent cobalt, with respect to oxygen dissolved in water, and to develop a suitable method for the activator-rich hydrazine solution. The object is accomplished in that trivalent phenols, preferably pyrogallol, are added in small amounts to the activator-rich hydrazine solution.
Inventors
- 👤 Wilfried Fuchs
- 👤 Horst Richter
- 👤 Vendelin Kaufmann
- 👤 Christina Muller
- 👤 Roland Kober
- 👤 Wolfgang Renker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:37
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; B; B01; B01D; B01D19/00; B01D19/0005; B01D19/02; B01D19/04; B01D19/0404; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A composition for improving the initial activity of activated hydrazine, with respect to hydrogen dissolved in water, comprising a trivalent cobalt complex with inorganic ligands as complex constituents, together with an added coactivator component selected from the group of trivalent phenols consisting of pyrogallol, oxyhydroquinone, and phloroglucine.
Claim 2
Dependent Claim
47 words
A composition for improving the initial activity of activated hydrazine, with respect to hydrogen dissolved in water, comprising a trivalent cobalt complex with inorganic ligands as complex constituents, together with an added coactivator component selected from the group of trivalent phenols consisting of pyrogallol, oxyhydroquinone, and phloroglucine.
Claim 3
Dependent Claim
24 words
An aqueous solution comprising 15 to 25% by volume of hydrazine and 0.05 to 0.5% by weight of a composition according to claim 1.
Claim 4
Dependent Claim
23 words
The composition of claim 1 which comprises 5 to 50% by weight of said component with respect to the amount of cobalt complex.
Claim 5
Dependent Claim
22 words
The composition of claim 3 which comprises about 10% by weight of said component with respect to the amount of cobalt complex.
Claim 6
Dependent Claim
21 words
The composition of claim 1 wherein the cobalt complex is selected from at least one of pentaminocobalt(III) chloride and sodium hexanitritocobalt(III).
Claim 7
Dependent Claim
51 words
A process for improving the initial activity of activated hydrazine, with respect to oxygen dissolved in water, which comprises adding to hydrazine a trivalent cobalt complex with inorganic ligands as complex constituents, together with an added coactivator component selected from the group of trivalent phenols consisting of pyrogallol, oxyhydroquinone, and phloroglucine.
Claim 8
Dependent Claim
51 words
A process for improving the initial activity of activated hydrazine, with respect to oxygen dissolved in water, which comprises adding to hydrazine a trivalent cobalt complex with inorganic ligands as complex constituents, together with an added coactivator component selected from the group of trivalent phenols consisting of pyrogallol, oxyhydroquinone, and phloroglucine.
Claim 9
Dependent Claim
28 words
The process of claim 6 wherein 0.05 to 0.5% by weight of said component is added to an aqueous solution comprising 15 to 25% by volume of hydrazine.
Claim 10
Dependent Claim
24 words
The process of claim 6 wherein 5 to 50% by weight of said component, with respect to the amount of cobalt complex, is added.
Claim 11
Dependent Claim
24 words
The process of claim 8 in which about 10% by weight of said component, with respect to the amount of cobalt complex, is added.
Claim 12
Dependent Claim
21 words
The process of claim 6 wherein the cobalt complex is selected from at least one of pentaminocobalt(III) chloride and sodium hexanitritocobalt(III).
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |