US4279767A
Expired / Lapsed
US
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Use of improved hydroquinone oxygen scavenger in aqueous mediums
Assignee: Veolia WTS USA Inc
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Filing: 1980-07-14
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Granted: 1981-07-21
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Expires: 2000-07-14
Abstract
Abstract An improved oxygen scavenger for aqueous mediums is disclosed which comprises hydrazine-free solution of hydroquinone and mu-amine.
Inventors
- 👤 John A. Muccitelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:45
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/20; C23; C23F; C23F11/00; C23F11/08; C23F11/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
A method for reducing the amount of oxygen in oxygen-containing feedwater to a boiler which method comprises adding to said feedwater an effective amount for the purpose of a hydrazine-free treatment comprising a stable solution of hydroquinone and mu-amine.
Claim 2
Independent Claim
39 words
A method for reducing the amount of oxygen in oxygen-containing feedwater to a boiler which method comprises adding to said feedwater an effective amount for the purpose of a hydrazine-free treatment comprising a stable solution of hydroquinone and mu-amine.
Claim 3
Dependent Claim
13 words
A method according to claim 1, wherein said solution is an aqueous solution.
Claim 4
Dependent Claim
27 words
A method according to claim 2, wherein said treatment is added in an amount of from about 0.1 to about 100 parts per million parts of feedwater.
Claim 5
Dependent Claim
32 words
A method according to claim 3, wherein the ratio of hydroquinone to mu-amine is about 7:1 to 1:99 and the total concentration of hydroquinone in said solution is about 45% or less.
Claim 6
Dependent Claim
13 words
A method according to claim 4, wherein said feedwater has an alkaline pH.
Claim 7
Dependent Claim
13 words
A method according to claim 5, wherein said pH is 9 or greater.
Claim 8
Dependent Claim
11 words
A method according to claim 4, wherein said mu-amine is methoxypropylamine.
Claim 9
Dependent Claim
11 words
A method according to claim 4, wherein said mu-amine is aminomethylpropanol.
Claim 10
Dependent Claim
21 words
A method according to claim 2 or 4, wherein the total amount of hydroquinone in solution is about 5% to 30%.
Claim 11
Dependent Claim
19 words
A method according to claim 9, wherein the total amount of hydroquinone in solution is about 10% to 20%.
Claim 12
Independent Claim
84 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium, which method comprises adding to the aqueous medium an effective amount for the purpose of a hydrazine-free treatment comprising a stable solution of hydroquinone and mu-amine, said treatment being added in an amount of from about 0.01 to about 10,000 parts per million parts of aqueous medium, wherein the ratio of hydroquinone to mu-amine is about 1:1.3 or less, and wherein said aqueous medium is that of a water heating system.
Claim 13
Independent Claim
84 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium, which method comprises adding to the aqueous medium an effective amount for the purpose of a hydrazine-free treatment comprising a stable solution of hydroquinone and mu-amine, said treatment being added in an amount of from about 0.01 to about 10,000 parts per million parts of aqueous medium, wherein the ratio of hydroquinone to mu-amine is about 1:1.3 or less, and wherein said aqueous medium is that of a water heating system.
Claim 14
Independent Claim
85 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium, which method comprises adding to the aqueous medium an effective amount for the purpose of a hydrazine-free treatment comprising a stable solution of hydroquinone and mu-amine, said treatment being added in an amount of from about 0.01 to about 10,000 parts per million parts of aqueous medium, wherein the ratio of hydroquinone to mu-amine is about 1:1.3 or less, and wherein said aqueous medium is condensed steam in a boiler condensate system.
Claim 15
Independent Claim
85 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium, which method comprises adding to the aqueous medium an effective amount for the purpose of a hydrazine-free treatment comprising a stable solution of hydroquinone and mu-amine, said treatment being added in an amount of from about 0.01 to about 10,000 parts per million parts of aqueous medium, wherein the ratio of hydroquinone to mu-amine is about 1:1.3 or less, and wherein said aqueous medium is condensed steam in a boiler condensate system.
Claim 16
Dependent Claim
16 words
A method according to claim 11 or 12, wherein said aqueous medium has an alkaline pH.
Claim 17
Dependent Claim
13 words
A method according to claim 13 wherein said pH is 9 or greater.
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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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |