US4339349A
Expired / Lapsed
US
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Corrosion inhibitors for limited oxygen systems
Assignee: Baker Hughes Holdings LLC
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Filing: 1980-02-11
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Granted: 1982-07-13
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Expires: 2000-02-11
Abstract
Abstract This invention relates to compositions useful in a limited oxygen system characterized by containing at least one of the following: (1) sulfur-oxygen phosphates (2) quaternaries (3) polyphosphate esters (4) cyclic amidines (5) trithiones. Where the limited oxygen system is aqueous and sour the above compositions (1), (2) and (3) are preferred. Where the limited oxygen system is sour and hydrocarbon/aqueous the above compositions (1), (2) and (4) are preferred. Where the limited oxygen system is sweet and aqueous the above compositions (1) and (3) are preferred. Where the limited oxygen system is sweet and hydrocarbon/aqueous the above compositions (3), (4) and (5) are preferred.
Inventors
- 👤 Richard L. Martin
- 👤 Evelyn W. Purdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C23; C23F; C23F11/00; C23F11/08; C23F11/10; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
34 words
Compositions useful as a corrosion inhibitor in limited oxygen aqueous system characterized by containing at least two of the following: (1) sulfur-oxygen phosphates (2) fatty quaternaries (3) polyphosphate esters (4) cyclic amidines (5) trithiones.
Claim 2
Dependent Claim
34 words
Compositions useful as a corrosion inhibitor in limited oxygen aqueous system characterized by containing at least two of the following: (1) sulfur-oxygen phosphates (2) fatty quaternaries (3) polyphosphate esters (4) cyclic amidines (5) trithiones.
Claim 3
Dependent Claim
27 words
A composition of claim 1, useful as a corrosion inhibitor in sour limited oxygen aqueous systems, which comprises: (1) sulfur-oxygen phosphates (2) fatty quaternaries (3) polyphosphate esters.
Claim 4
Dependent Claim
24 words
A composition of claim 1, useful in a sour limited oxygen hydrocarbon/aqueous system, which comprises: (1) sulfur-oxygen phosphates (2) fatty quaternaries (3) cyclic amidines.
Claim 5
Dependent Claim
25 words
A composition of claim 1, useful as a corrosion inhibitor in a sweet limited oxygen aqueous system, which comprises: (1) sulfur-oxygen phosphates (2) polyphosphate esters.
Claim 6
Dependent Claim
27 words
A composition of claim 1, useful as a corrosion inhibitor in a sweet limited oxygen hydrocarbon/aqueous system, which comprises: (1) trithiones (2) cyclic amidines (3) polyphosphate esters.
Claim 7
Dependent Claim
46 words
The composition of claim 2 where (1) the sulfur-oxygen phosphate is the reaction product of an oxyalkylated fatty alcohol and P 2 S 5 (2) the fatty quaternary is dimethyl benzyl fatty ammonium halide (3) the polyphosphate ester is an ester of an oxyalkylated fatty alcohol.
Claim 8
Dependent Claim
47 words
The composition of claim 3 where (1) the sulfur-oxygen phosphate is the reaction product of P 2 S 5 and an oxyalkylated fatty alcohol (2) the fatty quaternary is dimethyl benzyl fatty ammonium halide (3) the cyclic amidine is a fatty carboxylic acid salt of an imidazoline.
Claim 9
Dependent Claim
36 words
The composition of claim 4 where (1) the sulfur-oxygen phosphate is the reaction product of P 2 S 5 and an oxyalkylated fatty alcohol (2) the polyphosphate ester is an ester of an oxyalkylated fatty alcohol.
Claim 10
Dependent Claim
46 words
The composition of claim 5 where (1) the trithione is a quaternary of 4-neopentyl-5-t-butyl-1,2-dithiole-3-thione (2) the cyclic amidine is a salt of a phosphate ester of an oxyalkylated fatty alcohol and an imidazoline (3) the polyphosphate ester is a polyphosphate ester of an oxyalkylated fatty alcohol.
Claim 11
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 1.
Claim 12
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 2.
Claim 13
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 3.
Claim 14
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 4.
Claim 15
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 5.
Claim 16
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 6.
Claim 17
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 7.
Claim 18
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 8.
Claim 19
Dependent Claim
19 words
A process of inhibiting corrosion which comprises treating a limited oxygen aqueous system with the composition of claim 9.
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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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |