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US4541932A
Expired / Lapsed
US
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Hydroquinone catalyzed oxygen scavenger and methods of use thereof
Assignee: Veolia WTS USA Inc
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Filing: 1984-11-09
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Granted: 1985-09-17
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Expires: 2004-11-09
Abstract
Abstract Compositions and methods for chemically scavenging oxygen from an aqueous medium are disclosed. Furfural catalyzed by hydroquinone can be used as an oxygen scavenger in any aqueous medium, but is especially well adapted for use in boiler water systems.
Inventors
- 👤 John A. Muccitelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:35
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/20; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/122
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
34 words
A method for reducing the amount of oxygen in an aqueous medium comprising adding to said medium an effective amount for the purpose of a treatment comprising furfural and a catalytic amount of hydroquinone.
Claim 2
Independent Claim
34 words
A method for reducing the amount of oxygen in an aqueous medium comprising adding to said medium an effective amount for the purpose of a treatment comprising furfural and a catalytic amount of hydroquinone.
Claim 3
Dependent Claim
14 words
A method as recited in claim 1 wherein said treatment comprises an aqueous solution.
Claim 4
Dependent Claim
45 words
A method as recited in claim 1 wherein said treatment is added in an amount sufficient to provide in said aqueous medium from about 3.5 to 350 parts of furfural and from about 0.0014 to 0.140 parts hydroquinone, per million parts of said aqueous medium.
Claim 5
Dependent Claim
40 words
A method as recited in claim 3 further comprising adding a neutralizing amine to said aqueous medium in an amount of from about 0.1 to 50 parts of said neutralizing amine based upon one million parts of said aqueous medium.
Claim 6
Dependent Claim
28 words
A method as recited in claim 4 wherein said neutralizing amine comprises a member or members selected from the group consisting of methoxypropylamine, diethylaminoethanol, dimethyl(iso)propanolamine, 2-amino-2-methyl-1-propanol and ammonia.
Claim 7
Dependent Claim
13 words
A method as recited in claim 5 wherein said neutralizing amine comprises methoxypropylamine.
Claim 8
Dependent Claim
16 words
A method as recited in claim 1 wherein said aqueous medium comprises feedwater to a boiler.
Claim 9
Dependent Claim
19 words
A method as recited in claim 1 wherein said aqueous medium comprises condensed steam in a boiler condensate system.
Claim 10
Dependent Claim
15 words
A method as recited in claim 1 wherein said aqueous medium has an alkaline pH.
Claim 11
Dependent Claim
15 words
A method as recited in claim 9 wherein said pH is about 8 or greater.
Claim 12
Dependent Claim
21 words
A method as recited in claim 4 wherein said treatment comprises an aqueous solution and wherein said neutralizing amine comprises methoxypropylamine.
References Cited (Backward Citations)
US4278635A
Cited
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Cited
US4282111A
Cited
US4279767A
Cited
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Cited
US4487708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |