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US3896044A
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US
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Nitro-substituted aromatic acid corrosion inhibitors for alkanolamine gas treating system
Assignee: Union Carbide Corp
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Filing: 1973-11-02
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Granted: 1975-07-22
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Expires: 1993-11-02
Abstract
Abstract Corrosion of metallic surfaces by aqueous alkanolamine solutions employed in acid gas removal service can be inhibited by combinations of antimony and vanadium compounds, stannous salts, organo-tin compounds, nitro aromatic acids and their salts or benzotriazole.
Inventors
- 👤 Blake F Mago
- 👤 Charles W West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:52
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/14; C10K1/143; C23; C23F; C23F11/00; C23F11/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
38 words
A CORROSION INHIBITED COMPOSITION CONSISTING ESENTIALLY OF AN AQUEOUS ALKANOLAMINE SOLUTION EMPLOYED IN ACID GAS REMOVAL SERVICE AND AN INHIBITING AMOUNT OF A CORROSION NHIBITOR SELECTED FROM THE CLASS CONSISTING OF: NITRO-SUBSTITUTED AROMATIC ACIDS AND NITRO-SUBSTITUTED ACI SALTS.
Claim 2
Dependent Claim
38 words
A CORROSION INHIBITED COMPOSITION CONSISTING ESENTIALLY OF AN AQUEOUS ALKANOLAMINE SOLUTION EMPLOYED IN ACID GAS REMOVAL SERVICE AND AN INHIBITING AMOUNT OF A CORROSION NHIBITOR SELECTED FROM THE CLASS CONSISTING OF: NITRO-SUBSTITUTED AROMATIC ACIDS AND NITRO-SUBSTITUTED ACI SALTS.
Claim 3
Dependent Claim
12 words
Composition claimed in claim 1 wherein the corrosion inhibitor is sodium m-nitro-benzoate.
Claim 4
Dependent Claim
12 words
Composition claimed in claim 1 wherein the corrosion inhibitor is sodium 4-nitro-phthalate.
Claim 5
Dependent Claim
12 words
Composition claimed in claim 1 wherein the corrosion inhibitor is nitro-terephthalic acid.
Claim 6
Dependent Claim
46 words
Method for inhibiting corrosion of metallic surfaces by an aqueous alkanolamine solution employed in acid gas removal service comprising adding to said aqueous alkanolamine solution an inhibiting amount of a corrosion inhibitor selected from the group consisting of: nitro-substituted aromatic acids and nitro-substituted aromatic acid salts.
Claim 7
Dependent Claim
46 words
Method for inhibiting corrosion of metallic surfaces by an aqueous alkanolamine solution employed in acid gas removal service comprising adding to said aqueous alkanolamine solution an inhibiting amount of a corrosion inhibitor selected from the group consisting of: nitro-substituted aromatic acids and nitro-substituted aromatic acid salts.
Claim 8
Dependent Claim
15 words
Method claimed in claim 5 wherein said aqueous alknaolamine solution is an aqueous monoethanolamine system.
Claim 9
Dependent Claim
33 words
Method claimed in claim 5 wherein said corrosion inhibitor is present in an amount of from about 0.01 to about 2.0 percent by weight based upon the weight of said aqueous alkanolamine solution.
Claim 10
Dependent Claim
12 words
Method claimed in claim 5 wherein the corrosion inhibitor is nitro-terephthalic acid.
Claim 11
Dependent Claim
12 words
Method claimed in claim 5 wherein the corrosion inhibitor is sodium m-nitro-benzoate.
Claim 12
Dependent Claim
12 words
Method claimed in claim 5 wherein the corrosion inhibitor is sodium 4-nitro-phthalate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |