US3959170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitors for alkanolamine gas treating system
Assignee: Union Carbide Corp
•
Filing: 1973-11-02
•
Granted: 1976-05-25
•
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
2026-11-03 18:16
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/06; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/14; C10K1/143
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
47 words
A corrosion inhibited composition consisting essentially of an aqueous alkanolamine solution employed in acid gas removal service and an inhibiting amount of a stannous salt or mixtures thereof, said inhibiting amount being about 0.01 to about 2.0 percent based upon the weight of said aqueous alkanolamine solution.
Claim 2
Dependent Claim
47 words
A corrosion inhibited composition consisting essentially of an aqueous alkanolamine solution employed in acid gas removal service and an inhibiting amount of a stannous salt or mixtures thereof, said inhibiting amount being about 0.01 to about 2.0 percent based upon the weight of said aqueous alkanolamine solution.
Claim 3
Dependent Claim
12 words
Composition claimed in claim 1 wherein the stannous salt is stannous tartrate.
Claim 4
Dependent Claim
12 words
Composition claimed in claim 1 wherein the stannous salt is stannous gluconate.
Claim 5
Dependent Claim
12 words
Composition claimed in claim 1 wherein the stannous salt is stannous chloride.
Claim 6
Dependent Claim
12 words
Composition claimed in claim 1 wherein the stannous salt is stannous acetate.
Claim 7
Dependent Claim
12 words
Composition claimed in claim 1 wherein the stannous salt is stannous fluoborate.
Claim 8
Dependent Claim
54 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 stannous salt or mixtures thereof, said inhibiting amount being about 0.01 to about 2.0 percent based upon the weight of said aqueous alkanolamine solution.
Claim 9
Dependent Claim
54 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 stannous salt or mixtures thereof, said inhibiting amount being about 0.01 to about 2.0 percent based upon the weight of said aqueous alkanolamine solution.
Claim 10
Dependent Claim
15 words
Method claimed in claim 7 wherein said aqueous alkanolamine solution is an aqueous monoethanolamine system.
Claim 11
Dependent Claim
12 words
Method claimed in claim 7 wherein the stannous salt is stannous tartrate.
Claim 12
Dependent Claim
12 words
Method claimed in claim 7 wherein the stannous salt is stannous gluconate.
Claim 13
Dependent Claim
12 words
Method claimed in claim 7 wherein the stannous salt is stannous chloride.
Claim 14
Dependent Claim
12 words
Method claimed in claim 7 wherein the stannous salt is stannous acetate.
Claim 15
Dependent Claim
12 words
Method claimed in claim 7 wherein the stannous salt is stannous fluoborate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |