US4350606A
Expired / Lapsed
US
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Composition and method for inhibiting corrosion
Assignee: WR Grace and Co Conn
•
Filing: 1980-10-03
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Granted: 1982-09-21
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Expires: 2000-10-03
Abstract
Abstract Corrosion in steam condensate lines is inhibited by maintaining a mix of a hydroxylamine compound and a neutralizing amine in the water.
Inventors
- 👤 Dionisio G. Cuisia
- 👤 Chih M. Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:13
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/142; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
50 words
Composition consisting essentially of a hydroxylamine compound having the general formula ##STR2## where R 1 , R 2 , and R 3 are either the same or different and selected from the group consisting of hydrogen, lower alkyl and aryl, and the water-soluble salts thereof, and a second neutralizing amine.
Claim 2
Dependent Claim
50 words
Composition consisting essentially of a hydroxylamine compound having the general formula ##STR2## where R 1 , R 2 , and R 3 are either the same or different and selected from the group consisting of hydrogen, lower alkyl and aryl, and the water-soluble salts thereof, and a second neutralizing amine.
Claim 3
Dependent Claim
12 words
Composition according to claim 1 in which the hydroxylamine compound is N,N-diethylhydroxylamine.
Claim 4
Dependent Claim
18 words
Composition according to claim 2 in which the weight ratio of N,N-diethylhydroxylamine:second amine is about 0.001 to 1:1.
Claim 5
Dependent Claim
25 words
Composition according to claim 3 in which the second amine is a member selected from the group consisting of cyclohexylamine, morpholine, diethylaminoethanol, dimethylpropanolamine, or 2-amino-2-methyl-1-propanol.
Claim 6
Dependent Claim
12 words
Composition according to claim 4 in which the second amine is morpholine.
Claim 7
Dependent Claim
12 words
Composition according to claim 4 in which the second amine is cyclohexylamine.
Claim 8
Dependent Claim
12 words
Composition according to claim 4 in which the second amine is diethylaminoethanol.
Claim 9
Dependent Claim
12 words
Composition according to claim 4 in which the second amine is dimethylpropanolamine.
Claim 10
Dependent Claim
12 words
Composition according to claim 4 in which the second amine is 2-amino-2-methyl-1-propanol.
Claim 11
Dependent Claim
30 words
Composition according to claim 4 in which the second amine is a mixture of two or more amines selected from the group consisting of cyclohexylamine, morpholine, diethylaminoethanol, dimethylpropanolamine, or 2-amino-2-methyl-1-propanol.
Claim 12
Dependent Claim
17 words
Composition according to claim 10 in which the second amine is a mixture of morpholine and cyclohexylamine.
Claim 13
Dependent Claim
20 words
Composition according to claim 10 in which the second amine is a mixture of morpholine, cyclohexylamine, diethylaminoethanol, dimethylpropanolamine, and 2-amino-2-methyl-1-propanol.
Claim 14
Dependent Claim
71 words
Method of inhibiting corrosion in steam condensate lines, comprising maintaining in solution therein, 0.001 to 100 ppm of a hydroxylamine compound having the general formula: ##STR3## wherein R 1 , R 2 , and R 3 are either the same or different and selected from the group consisting of hydrogen, lower alkyl and aryl, and the water-soluble salts thereof, and 1 to 1,500 ppm of at least one additional neutralizing amine.
Claim 15
Dependent Claim
71 words
Method of inhibiting corrosion in steam condensate lines, comprising maintaining in solution therein, 0.001 to 100 ppm of a hydroxylamine compound having the general formula: ##STR3## wherein R 1 , R 2 , and R 3 are either the same or different and selected from the group consisting of hydrogen, lower alkyl and aryl, and the water-soluble salts thereof, and 1 to 1,500 ppm of at least one additional neutralizing amine.
Claim 16
Dependent Claim
12 words
Method according to claim 13 in which the hydroxylamine compound is N,N-diethylhydroxylamine.
Claim 17
Dependent Claim
23 words
Method according to claim 14 in which the N,N-diethylhydroxylamine is maintained at about 5 ppm and the additional amine at about 100 ppm.
Claim 18
Dependent Claim
25 words
Method according to claim 14 in which the additional amine is a member selected from the group consisting of cyclohexylamine, morpholine, diethylaminoethanol, dimethylpropanolamine, or 2-amino-2-methyl-1-propanol.
Claim 19
Dependent Claim
12 words
Method according to claim 16 in which the additional amine is morpholine.
Claim 20
Dependent Claim
12 words
Method according to claim 16 in which the additional amine is cyclohexylamine.
Claim 21
Dependent Claim
12 words
Method according to claim 16 in which the additional amine is diethylaminoethanol.
Claim 22
Dependent Claim
12 words
Method according to claim 16 in which the additional amine is dimethylpropanolamine.
Claim 23
Dependent Claim
12 words
Method according to claim 16 in which the additional amine is 2-amino-2-methyl-1-propanol.
Claim 24
Dependent Claim
30 words
Method according to claim 16 in which the additional amine is a mixture of two or more amines selected from the group consisting of cyclohexylamine, morpholine, diethylaminoethanol, dimethylpropanolamine, or 2-amino-2-methyl-1-propanol.
Claim 25
Dependent Claim
17 words
Method according to claim 22 in which the additional amine is a mixture of morpholine and cyclohexylamine.
Claim 26
Dependent Claim
20 words
Method according to claim 22 in which the additional amine is a mixture of morpholine, cyclohexylamine, diethylaminoethanol, dimethylpropanolamine, and 2-amino-2-methyl-1-propanol.
References Cited (Backward Citations)
US4067690A
Cited
US4206172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |