US4626411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for deoxygenation
Assignee: Grace Dearborn Inc
•
Filing: 1985-04-17
•
Granted: 1986-12-02
•
Expires: 2005-04-17
Abstract
Abstract A composition containing a hydroxylamine compound; a quinone, a dihydroxybenzene, a diaminobenzene, or an aminohydroxybenzene compound; and a neutralizing amine is an excellent oxygen scavenger and corrosion inhibitor in boiler water and other aqueous systems.
Inventors
- 👤 John J. Nemes
- 👤 Harvey W. Thompson
- 👤 John E. Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:55
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C02; C02F; C02F1/00; C02F1/20; C23F11/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
171 words
A composition which is useful for inhibiting corrosion due to the presence of oxygen in aqueous systems comprising: (a) at least one hydroxylamine compound having the general formula ##STR3## in which R 1 , R 2 and R 3 are either the same or different and are selected from the group consisting of hydrogen, lower alkyl and aryl, or a water soluble salt of said hydroxylamine compound; (b) at least one compound having the general formula: ##STR4## in which R and R 1 are independently selected from the group consisting of --OH, --NH 2 ; R 2 is lower alkyl containing 1 to 8 carbon atoms; and M is selected from the group consisting of H, Na, K and combinations thereof; and (c) at least one neutralizing amine; the weight ratio of the hydroxylamine compound component to the neutralizing amine component being between about 10:1 to about 1:10, and the weight ratio of the quinone or benzene compound component to the neutralizing amine component being between about 10:1 to about 1:100.
Claim 2
Dependent Claim
171 words
A composition which is useful for inhibiting corrosion due to the presence of oxygen in aqueous systems comprising: (a) at least one hydroxylamine compound having the general formula ##STR3## in which R 1 , R 2 and R 3 are either the same or different and are selected from the group consisting of hydrogen, lower alkyl and aryl, or a water soluble salt of said hydroxylamine compound; (b) at least one compound having the general formula: ##STR4## in which R and R 1 are independently selected from the group consisting of --OH, --NH 2 ; R 2 is lower alkyl containing 1 to 8 carbon atoms; and M is selected from the group consisting of H, Na, K and combinations thereof; and (c) at least one neutralizing amine; the weight ratio of the hydroxylamine compound component to the neutralizing amine component being between about 10:1 to about 1:10, and the weight ratio of the quinone or benzene compound component to the neutralizing amine component being between about 10:1 to about 1:100.
Claim 3
Dependent Claim
13 words
The composition of claim 1 in which component (a) is N,N diethylhydroxyl amine.
Claim 4
Dependent Claim
11 words
The composition of claim 2 in which component (b) is hydroquinone.
Claim 5
Dependent Claim
11 words
The composition of claim 1 in which component (b) is hydroquinone.
Claim 6
Dependent Claim
40 words
The composition of claim 1 in which the weight ratio of component (a) to component (c) is from about 5:1 to about 1:1 and the weight ratio of component (b) to component (c) is from about 1:1 to about 1:10.
Claim 7
Dependent Claim
20 words
The composition of claim 1 in which component (a) is N,N-diethylhydroxylamine, component (b) is hydroquinone, and component (c) is diethylaminoethanol.
Claim 8
Dependent Claim
40 words
The composition of claim 6 in which the weight ratio of component (a) to component (c) is from about 5:1 to about 1:1 and the weight ratio of component (b) to component (c) is from about 1:1 to about 1:10.
Claim 9
Independent Claim
218 words
A method for inhibiting corrosion of metal surfaces in water in an aqueous system comprising adding to the system water: (a) at least one hydroxylamine compound having the general formula ##STR5## in which R 1 , R 2 and R 3 are either the same or different and are selected from the group consisting of hydrogen, lower alkyl and aryl, or a water soluble salt of said hydroxylamine compound; (b) at least one quinone or benzene compound having the general formula ##STR6## in which R and R 1 are independently selected from the group consisting of --OH, --NH 2 ; R 2 is lower alkyl containing 1 to 8 carbon atoms; and M is selected from the group consisting of H, Na, K and combinations thereof; and (c) at least one neutralizing amine; the weight ratio of the added hydroxylamine compound component to the added neutralizing amine component being between about 100:1 to about 1:1,500, and the weight ratio of the added quinone or benzene compound component to the added neutralizing amine component being between about 10:1 to about 1:100; and the total dosage of the hydroxylamine compound component, the quinone or benzene compound component, and the neutralizing amine component to the system water together being a corrosion-inhibiting amount between about 0.1 to about 1,500 parts per million.
Claim 10
Independent Claim
218 words
A method for inhibiting corrosion of metal surfaces in water in an aqueous system comprising adding to the system water: (a) at least one hydroxylamine compound having the general formula ##STR5## in which R 1 , R 2 and R 3 are either the same or different and are selected from the group consisting of hydrogen, lower alkyl and aryl, or a water soluble salt of said hydroxylamine compound; (b) at least one quinone or benzene compound having the general formula ##STR6## in which R and R 1 are independently selected from the group consisting of --OH, --NH 2 ; R 2 is lower alkyl containing 1 to 8 carbon atoms; and M is selected from the group consisting of H, Na, K and combinations thereof; and (c) at least one neutralizing amine; the weight ratio of the added hydroxylamine compound component to the added neutralizing amine component being between about 100:1 to about 1:1,500, and the weight ratio of the added quinone or benzene compound component to the added neutralizing amine component being between about 10:1 to about 1:100; and the total dosage of the hydroxylamine compound component, the quinone or benzene compound component, and the neutralizing amine component to the system water together being a corrosion-inhibiting amount between about 0.1 to about 1,500 parts per million.
Claim 11
Dependent Claim
12 words
The method of claim 8 in which component (a) is N,N diethylhydroxylamine.
Claim 12
Dependent Claim
11 words
The method of claim 9 in which component (b) is hydroquinone.
Claim 13
Dependent Claim
25 words
The method of claim 8 in which from about 0.1 to about 100 parts per million of the oxygen scavenger are added to the system.
Claim 14
Dependent Claim
40 words
The method of claim 8 in which the weight ratio of component (a) to component (c) is from about 10:1 to about 1:10 and the weight ratio of component (b) to component (c) is from about 5:1 to about 1:50.
Claim 15
Dependent Claim
40 words
The method of claim 8 in which the weight ratio of component (a) to component (c) is from about 5:1 to about 1:1 and the weight ratio of component (b) to component (c) is from about 1:1 to about 1:10.
Claim 16
Dependent Claim
20 words
The method of claim 8 in which component (a) is N,N-diethylhydroxylamine, component (b) is hydroquinone, and component (c) is diethylaminoethanol.
Claim 17
Dependent Claim
17 words
The method of claim 8 in which the water in the aqueous system has an alkaline pH.
Claim 18
Dependent Claim
21 words
The method of claim 8 in which the water in the aqueous system has a pH of greater than about 8.5
Claim 19
Dependent Claim
15 words
The method of claim 8 in which the aqueous system is a boiler water system.
Claim 20
Dependent Claim
14 words
The method of claim 8 in which the water comprises feedwater for a boiler.
Claim 21
Dependent Claim
17 words
The method of claim 8 in which the water comprises condensed steam in a boiler condensate system.
Claim 22
Dependent Claim
11 words
The method of claim 8 in which component (b) is hydroquinone.
References Cited (Backward Citations)
US3843547A
Cited
US4124500A
Cited
US4067690A
Cited
US4278635A
Cited
US4278635B1
Cited
US4282111A
Cited
US4279767A
Cited
US4289645A
Cited
US4350606A
Cited
JPS57204288A
Cited
US4549968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |