Patent US3779935A successfully refreshed from Google Patents.
US3779935A
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US
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Inhibition of corrosion
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-07-12
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Granted: 1973-12-18
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Expires: 1991-07-12
Abstract
Abstract Corrosion of ferrous metals by corrosive acids at elevated temperatures is inhibited by adding to the corrosive acid a composition comprising effective amounts of at least one acetylenic alcohol, a quaternary ammonium compound and/or an amine, a surfactant, an organic solvent, and a formic acid compound selected from the group consisting of formate esters of the structure:
Inventors
- 👤 J Looney
- 👤 L Mcdougall
- 👤 T Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:19
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2093; C11D1/00; C11D1/38; C11D1/62; C11D3/0005; C11D3/0073; C11D3/164; C11D3/26; C11D3/28; C11D3/30; C11D3/34; C11D3/349; C11D3/43; C23; C23F; C23F11/00; C23F11/04; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
16 words
A composition in accordance with claim 1 in which the ammonium compound is a quaternary compound.
Claim 2
Dependent Claim
15 words
A composition in accordance with claim 1 in which the ammonium compound is an amine.
Claim 3
Dependent Claim
18 words
A composition in accordance with claim 1 in which the acetylenic alcohol has 3 to 10 carbon atoms.
Claim 4
Dependent Claim
21 words
A composition in accordance with claim 1 containing a solvent effective amount up to 40 weight percent of a liquid alkanol.
Claim 5
Dependent Claim
14 words
A composition in accordance with claim 5 in which the alkanol is isopropyl alcohol.
Claim 6
Dependent Claim
21 words
A composition in accordance with claim 1 containing a non-ionic surfactant in an amount from about 0.25 to 2.0 weight percent.
Claim 7
Dependent Claim
22 words
A composition in accordance with claim 7 in which the surfactant is an 8 to 12 mole polyoxyethylene adduct of nonyl phenol.
Claim 8
Dependent Claim
34 words
A composition in accordance with claim 7 in which the surfactant is an 8 to 12 mole ethylene oxide adduct of an alkyl phenol having 8 to 20 carbon atoms in the alkyl group.
Claim 9
Dependent Claim
18 words
A composition in accordance with claim 9 in which the acetylenic alcohol has 3 to 10 carbon atoms.
Claim 10
Dependent Claim
22 words
A composition in accordance with claim 1 in which the acetylenic alcohol is a mixture of ethyl octynol, propargyl alcohol and hexynol.
Claim 11
Independent Claim
62 words
A method for inhibiting the corrosivity of a corrosive acid in contact with a ferrous metal at elevated temperatures which comprises adding to said corrosive acid an inhibiting amount of a ferrous metal corrosion inhibiting composition consisting essentially of corrosion inhibiting effective amounts of: a. about 3 to about 25 weight percent of at least 1 acetylenic alcohol having the structural formula:
Claim 12
Dependent Claim
15 words
A method in accordance with claim 12 in which the corrosive acid is hydrochloric acid.
Claim 13
Dependent Claim
31 words
A method in accordance with claim 12 in which the inhibiting amount is within the range from about 0.25 percent to about 10.0 percent by volume based on the corrosive acid.
Claim 14
Dependent Claim
14 words
A method in accordance with claim 12 in which the ferrous metal is steel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |