US4522785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialkylaminomethyl aromatic triazoles as corrosion inhibitors
Assignee: PMC Inc
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Filing: 1982-11-04
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Granted: 1985-06-11
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Expires: 2002-11-04
Abstract
Abstract This invention involves a process for minimizing corrosion of metals in contact with aqueous acid solutions wherein said process comprises adding to the aqueous acid solution a corrosion inhibiting amount of a dialkylaminomethyl aromatic triazole having the structure: ##STR1## wherein R 1 is from 1 to 4 substituents and is hydrogen, aliphatic of 1 to about 12 carbons, alkoxy of 2 to about 10 carbons, aroxy of 2 to about 10 carbons, or --COOR 4 wherein R 4 is aliphatic of 1 to about 12 carbons; and R 2 and R 3 are the same or different and are alkyl of 1 to about 4 carbons.
Inventors
- 👤 Michael J. D'Errico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:17
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
A process for reducing the corrosion of ferrous metals in contact with aqueous acidic solutions wherein said process comprises adding to the aqueous acidic solution a corrosion inhibiting amount of a dialkylaminomethyl aromatic triazole having the structure: ##STR4## wherein R 1 is from 1 to 4 substituents and is hydrogen, aliphatic of 1 to about 12 carbons, alkoxy of 2 to about 10 carbons, aroxy of 2 to about 10 carbons, or --COOR 4 wherein R 4 is aliphatic of 1 to about 12 carbons; and R 2 and R 3 are the same or different and are alkyl of 1 to about 4 carbons.
Claim 2
Dependent Claim
105 words
A process for reducing the corrosion of ferrous metals in contact with aqueous acidic solutions wherein said process comprises adding to the aqueous acidic solution a corrosion inhibiting amount of a dialkylaminomethyl aromatic triazole having the structure: ##STR4## wherein R 1 is from 1 to 4 substituents and is hydrogen, aliphatic of 1 to about 12 carbons, alkoxy of 2 to about 10 carbons, aroxy of 2 to about 10 carbons, or --COOR 4 wherein R 4 is aliphatic of 1 to about 12 carbons; and R 2 and R 3 are the same or different and are alkyl of 1 to about 4 carbons.
Claim 3
Dependent Claim
14 words
The process of claim 1 further characterized in that the aromatic triazole is 1-dimethylaminomethylbenzotriazole.
Claim 4
Dependent Claim
14 words
The process of claim 1 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-4-methyl-benzotriazole.
Claim 5
Dependent Claim
14 words
The process of claim 1 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-5-methyl-benzotriazole.
Claim 6
Dependent Claim
14 words
The process of claim 1 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-4-dodecyl-benzotriazole.
Claim 7
Dependent Claim
14 words
The process of claim 1 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-5-dodecyl-benzotriazole.
Claim 8
Dependent Claim
14 words
The process of claim 1 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-5-carboxymethyl-benzotriazole.
Claim 9
Dependent Claim
32 words
The process of claim 1 further characterized in that the aromatic triazole is added at a level of at least about 1 part triazole per 1 million parts by weight aqueous solution.
Claim 10
Dependent Claim
33 words
The process of claim 1 further characterized in that the aromatic triazole is present at a level of between about 1 to 50,000 parts by weight triazole per 1 million parts aqueous solution.
Claim 11
Dependent Claim
116 words
A process for minimizing the corrosion of steel in contact with an aqueous acid solution which process comprises adding to the aqueous acid solution about 1 to about 50,000 parts by weight per 1 million parts of the aqueous acid solution, a dialkylaminomethyl aromatic triazole having the structure: ##STR5## wherein R 1 is from 1 to 4 substituents and is hydrogen, aliphatic of 1 to about 12 carbons, alkoxy of 2 to about 10 carbons, aroxy of 2 to about 10 carbons, or --COOR 4 wherein R 4 is aliphatic of 1 to about 12 carbons; and R 2 and R 3 are the same or different and are alkyl of 1 to about 4 carbons.
Claim 12
Dependent Claim
116 words
A process for minimizing the corrosion of steel in contact with an aqueous acid solution which process comprises adding to the aqueous acid solution about 1 to about 50,000 parts by weight per 1 million parts of the aqueous acid solution, a dialkylaminomethyl aromatic triazole having the structure: ##STR5## wherein R 1 is from 1 to 4 substituents and is hydrogen, aliphatic of 1 to about 12 carbons, alkoxy of 2 to about 10 carbons, aroxy of 2 to about 10 carbons, or --COOR 4 wherein R 4 is aliphatic of 1 to about 12 carbons; and R 2 and R 3 are the same or different and are alkyl of 1 to about 4 carbons.
Claim 13
Dependent Claim
14 words
The process of claim 10 further characterized in that the aromatic triazole is 1-(dimethylaminomethylbenzotriazole.
Claim 14
Dependent Claim
14 words
The process of claim 10 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-4-methylbenzotriazole.
Claim 15
Dependent Claim
14 words
The process of claim 10 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-5-methylbenzotriazole.
Claim 16
Dependent Claim
14 words
The process of claim 10 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-4-dodecylbenzotriazole.
Claim 17
Dependent Claim
14 words
The process of claim 10 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-5-dodecylbenzotriazole.
Claim 18
Dependent Claim
14 words
The process of claim 10 further characterized in that the aromatic triazole is 1-(dimethylaminomethyl)-5-carboxymethylbenzotriazole.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |