US4549968A
Expired / Lapsed
US
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Method of utilizing improved stability oxygen scavenger compositions
Assignee: Veolia WTS USA Inc
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Filing: 1984-05-18
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Granted: 1985-10-29
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Expires: 2004-05-18
Abstract
Abstract Stable oxygen scavenger compositions adapted for storage without resulting in substantial sludge formation and oxygen scavenging methods of using the compositions are disclosed. The compositions comprise hydroquinone, a compatible amine termed a mu-amine, and a member selected from the group consisting of isoascorbic acid and ascorbic acid and water soluble salt forms thereof. Methods comprise adding from about 0.05-200 ppm hydroquinone, 0.001-400 ppm mu-amine, and about 0.00025-500 ppm of isoascorbic or ascorbic acid to the desired aqueous medium.
Inventors
- 👤 John A. Muccitelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:40
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 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 a stable solution of (a) hydroquinone, (b) mu-amine and (c) a member selected from the group consisting of isoascorbic acid, ascorbic acid and water soluble salt forms thereof, the weight ratio of (a):(b):(c) being within the range of 1:0.02-2.0:0.05-2.5, said stable solution being adapted for storage without resulting in substantial sludge formation therein.
Claim 2
Independent Claim
80 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 a stable solution of (a) hydroquinone, (b) mu-amine and (c) a member selected from the group consisting of isoascorbic acid, ascorbic acid and water soluble salt forms thereof, the weight ratio of (a):(b):(c) being within the range of 1:0.02-2.0:0.05-2.5, said stable solution being adapted for storage without resulting in substantial sludge formation therein.
Claim 3
Dependent Claim
14 words
A method as recited in claim 1 wherein said solution is an aqueous solution.
Claim 4
Dependent Claim
34 words
A method as recited in claim 2 wherein said treatment is added in an amount sufficient to provide from about 0.001-400 parts of said mu-amine (b) to one million parts of said aqueous medium.
Claim 5
Dependent Claim
34 words
A method as recited in claim 2 wherein said treatment is added in an amount sufficient to provide from about 0.00025-500 parts of said member (c) to one million parts of said aqueous medium.
Claim 6
Dependent Claim
34 words
A method as recited in claim 1 wherein said treatment is added in an amount sufficient to provide from abut 0.05-200 parts of hydroquinone (a) based upon one million parts of said aqueous medium.
Claim 7
Dependent Claim
32 words
A method as recited in claim 1 wherein said mu-amine (b) comprises a member selected from the group consisting of aminomethylpropanol, triethylenetetraamine, diisopropanolamine, sec-butylamine, monoisopropanolamine, ethylenediamine, dimethylaminopropylamine, monoethanolamine, dimethyl(iso)propanolamine, methoxypropylamine, and diethylaminoethanol.
Claim 8
Dependent Claim
20 words
A method as recited in claim 1 wherein said member (c) comprises isoascorbic acid or water soluble salt form thereof.
Claim 9
Dependent Claim
11 words
A method as recited in claim 7 wherein mu-amine comprises methoxypropylamine.
Claim 10
Dependent Claim
16 words
A method as recited in claim 1 wherein said aqueous medium comprises feedwater to a boiler.
Claim 11
Dependent Claim
32 words
A method as recited in claim 9 wherein said solution is an aqueous solution, said mu-amine (b) being methoxypropylamine and said member (c) being isoascorbic acid or water soluble salt form thereof.
Claim 12
Dependent Claim
19 words
A method as recited in claim 1 wherein said aqueous medium comprises condensed steam in a boiler condensate system.
Claim 13
Dependent Claim
32 words
A method as recited in claim 11 wherein said solution is an aqueous solution, said mu-amine (b) being methoxypropylamine and said member (c) being isoascorbic acid or water soluble salt form thereof.
Claim 14
Dependent Claim
15 words
A method as recited in claim 1 wherein said aqueous medium has an alkaline pH.
Claim 15
Dependent Claim
15 words
A method as recited in claim 13 wherein said pH is about 8 or greater.
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Cited
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |