US4540494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the removal of oxygen dissolved in water
Assignee: VEB LEUNA-WERKE WALTER ULBRICHT" 422 LEUNA 3 GERMANY
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Filing: 1983-03-10
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Granted: 1985-09-10
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Expires: 2003-03-10
Abstract
Abstract A method for removal of oxygen dissolved in water, especially from reservoir drinking water, and for preservation purposes based on hydrazine, having no organic activators and assuring a high reaction velocity with respect to dissolved oxygen within a broad pH-range at low temperature and without a time-dependent reduction of its effectiveness. Cationic and anionic complexes of trivalent cobalt with inorganic ligands, or mixtures thereof, are used as activators. Preferred activators are (Co(NH 3 ) 5 Cl)Cl 2 and Na 3 Co(NO 2 ) 6 . Hydrazine solutions with these activators are suitable for the removal of oxygen from gases.
Inventors
- 👤 Wilfried Fuchs
- 👤 Horst Richter
- 👤 Vendelin Kaufmann
- 👤 Wolfgang Renker
- 👤 Roland Kober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A process for the removal of oxygen dissolved in water by improving the activity of hydrazine as an oxygen removal agent which comprises adding an effective amount of hydrazine and a trivalent cobalt complex selected from the group consisting of sodium hexanitritocobalt (III), cobalt (III) hexaminochloride, chloropentamine cobalt (III) chloride, carbonatopentamino cobalt (III) nitrate, and mixtures thereof, to oxygen-containing water, about 0.01 to 0.3% by weight of cobalt complex being added to an aqueous solution comprising about 10 to 25% by volume of hydrazine, said cobalt complex and hydrazine being added to said oxygen-containing water at a pH of about 8 to 11.
Claim 2
Dependent Claim
103 words
A process for the removal of oxygen dissolved in water by improving the activity of hydrazine as an oxygen removal agent which comprises adding an effective amount of hydrazine and a trivalent cobalt complex selected from the group consisting of sodium hexanitritocobalt (III), cobalt (III) hexaminochloride, chloropentamine cobalt (III) chloride, carbonatopentamino cobalt (III) nitrate, and mixtures thereof, to oxygen-containing water, about 0.01 to 0.3% by weight of cobalt complex being added to an aqueous solution comprising about 10 to 25% by volume of hydrazine, said cobalt complex and hydrazine being added to said oxygen-containing water at a pH of about 8 to 11.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said oxygen-containing water is at a temperature of 283° K. to 303° K.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein 0.05 to 0.1% by weight of cobalt complex is added to an aqueous solution comprising 20 to 25% by volume of hydrazine.
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) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |