US3932296A
Expired / Lapsed
US
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Corrosion inhibitor
Assignee: Schlumberger Technology Corp
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Filing: 1973-05-29
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Granted: 1976-01-13
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Expires: 1993-05-29
Abstract
Abstract The corrosion inhibitor of the present invention comprises a mixture containing (a) the reaction product of a nitrogen containing compound containing at least one active hydrogen attached to the nitrogen atom per molecule; a ketone having at least one hydrogen atom attached to the carbon atom alpha to the carbonyl group; an aldehyde; a fatty acid, and a quaternary ammonium compound and (b) a secondary quaternary compound which is different from the quaternary compound employed to prepare the reaction product. The inhibitor is added to acidic media which comes into contact with a metal to be protected.
Inventors
- 👤 Nancy J. Byth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:50
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; C23F11/04; C09K2208/00; C09K2208/32; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A corrosion inhibitor comprising: a. the reaction product of about 1 mole of an organic ammonia derivative containing at least one active hydrogen attached to the nitrogen atom per molecule; from about 1.5 to about 10 moles of a ketone having at least one hydrogen atom attached to the carbon atom alpha to the carbonyl group, from about 2 to about 10 moles of an aldehyde; from about 0.3 to about 24 parts by weight, based on the other four reactants of a fatty acid containing from 1 to about 20 carbon atoms and from about 0.005 to about 0.10 mole of a first quaternary ammonium compound, in admixture with, b. from about 0.5 to about 10 parts by volume of a secondary quaternary ammonium which is different from the first quaternary ammonium compound.
Claim 2
Dependent Claim
134 words
A corrosion inhibitor comprising: a. the reaction product of about 1 mole of an organic ammonia derivative containing at least one active hydrogen attached to the nitrogen atom per molecule; from about 1.5 to about 10 moles of a ketone having at least one hydrogen atom attached to the carbon atom alpha to the carbonyl group, from about 2 to about 10 moles of an aldehyde; from about 0.3 to about 24 parts by weight, based on the other four reactants of a fatty acid containing from 1 to about 20 carbon atoms and from about 0.005 to about 0.10 mole of a first quaternary ammonium compound, in admixture with, b. from about 0.5 to about 10 parts by volume of a secondary quaternary ammonium which is different from the first quaternary ammonium compound.
Claim 3
Dependent Claim
66 words
The corrosion inhibitor of claim 1 wherein the reaction product comprises the reaction of about 1 mole of said nitrogen containing compound with about 1.5 to about 10 moles of said ketone, about 2 to about 10 moles of said aldehyde, about 0.3 to about 3 parts by weight of a fatty acid, and about 0.005 to about 0.10 mole of said first quaternary ammonium compound.
Claim 4
Dependent Claim
73 words
The corrosion inhibitor of claim 2 comprising from about 20 to about 90 parts by volume of said reaction product, 0 to about 50 parts by volume of an acetylenic alcohol corrosion inhibitor, 0 to about 80 parts by volume of a lower molecular weight alkyl alcohol, 0 to about 20 parts by volume of a surfactant and from about 0.5 to about 10 parts by volume of said second quaternary ammonium compound.
Claim 5
Dependent Claim
79 words
The corrosion inhibitor of claim 2 comprising from about 40 to about 55 parts by volume of said reaction product, from about 8 to about 12 parts by volume of an acetylenic alcohol, from about 30 to about 40 parts by volume of a lower molecular weight alkyl alcohol, 2 to about 8 parts by volume of a surfactant other than a quaternary ammonium compound, and 0.5 to about 5 parts by weight of a second quaternary ammonium compound.
Claim 6
Dependent Claim
23 words
An inhibited acid comprising: a. an acid and b. at least about 0.01 percent by weight of the inhibitor defined in claim 1.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |