US4387042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitor comprising the ethynylation reaction product of a dialkylamine, a substituted benzaldehyde and acetylene
Assignee: GAF Chemicals Corp
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Filing: 1981-10-15
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Granted: 1983-06-07
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Expires: 2001-10-15
Abstract
Abstract A corrosion inhibitor for aqueous solutions of mineral acids consisting essentially of the reaction product obtained by the catalytic ethynylation of a dialkylamine, a substituted benzaldehyde and acetylene, said reaction product being a complex material which contains predominately a 3-dialkylamino-3-(substituted phenyl) prop-l-yne.
Inventors
- 👤 Eugene V. Hort
- 👤 Lowell R. Anderson
- 👤 Dru W. Alwani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:30
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/068; C23F; C23F11/00; C23F11/04; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
77 words
A corrosion inhibitor for aqueous solutions of mineral acids consisting essentially of the reaction product obtained by the catalytic ethynylation of a dialkylamine, R 1 R 2 NH, where R 1 and R 2 are independently alkyl C 1 -C 8 , and a substituted benzaldehyde having the formula: ##STR5## where R 3 is independently halo, alkyl C 1 -C 8 , or alkoxy C 1 -C 8 , and n is 1 or 2, with acetylene.
Claim 2
Dependent Claim
77 words
A corrosion inhibitor for aqueous solutions of mineral acids consisting essentially of the reaction product obtained by the catalytic ethynylation of a dialkylamine, R 1 R 2 NH, where R 1 and R 2 are independently alkyl C 1 -C 8 , and a substituted benzaldehyde having the formula: ##STR5## where R 3 is independently halo, alkyl C 1 -C 8 , or alkoxy C 1 -C 8 , and n is 1 or 2, with acetylene.
Claim 3
Dependent Claim
17 words
A reaction product according to claim 1 in which said ethynylation is carried out in a solvent.
Claim 4
Dependent Claim
16 words
A reaction product according to claim 2 in which said solvent is removed after said reaction.
Claim 5
Dependent Claim
24 words
A reaction product according to claim 1 which contains a predominate amount of a 3-dialkylamino-3-(substituted phenyl)prop-1-yne and which is free of solvent and catalyst.
Claim 6
Dependent Claim
12 words
A reaction product according to claim 1 wherein R 3 is halo.
Claim 7
Dependent Claim
12 words
A reaction product according to claim 1 wherein R 3 is chlorine.
Claim 8
Dependent Claim
17 words
A reaction product according to claim 1 wherein R 3 is alkyl C 1 -C 8 .
Claim 9
Dependent Claim
17 words
A reaction product according to claim 1 wherein R 3 is alkoxy C 1 -C 8 .
Claim 10
Dependent Claim
20 words
A reaction product according to claim 1 wherein in said compound both R 1 and R 2 are the same.
Claim 11
Dependent Claim
11 words
A reaction product according to claim 1 wherein n is 1.
Claim 12
Dependent Claim
11 words
A reaction product according to claim 1 wherein n is 2.
Claim 13
Dependent Claim
12 words
A reaction product according to claim 1 which contains predominately a 3-dialkylamino-3-(2,4-dichlorophenyl)prop-1-yne.
Claim 14
Dependent Claim
11 words
A reaction product according to claim 1 which contains predominately 3-dialkylamino-3-(2-chlorophenyl)prop-1-yne.
Claim 15
Dependent Claim
11 words
A reaction product according to claim 1 which contains predominately 3-dialkylamino-3-(4-alkylphenyl)prop-1-yne.
Claim 16
Dependent Claim
11 words
A reaction product according to claim 1 which contains predominately 3-dialkylamino-3-(4-methoxyphenyl)prop-1-yne.
Claim 17
Dependent Claim
11 words
A reaction product according to claim 1 which contains predominately 3-dibutylamino-3-(2-chlorophenyl)prop-1-yne.
Claim 18
Dependent Claim
110 words
A reaction product according to claim 1 in which said ethynylation is carried out using a catalyst comprising a complex cuprous acetylide prepared from a precursor containing about 5 to 35% by weight of copper, and 2-3% by weight of bismuth, as the oxides, on a magnesium silicate carrier, at a pressure of about 0.1 to 20 atmospheres, at about 70° to 115° C., in an organic solvent selected from alcohols, ketones and amides, in molar ratio of about 1:1 of dialkylamine to substituted benzaldehyde, for from about 0.2 to 36 hours, and is substantially free of solvent and catalyst, said product containing a predominate amount of a 3-dialkylamino-3-(substituted phenyl)prop-1-yne.
Claim 19
Dependent Claim
24 words
An aqueous acidic solution inhibited to corrosion of metal consisting essentially of an effective amount of the reaction product as defined in claim 1.
Claim 20
Dependent Claim
35 words
A method of inhibiting the corrosive action of an aqueous solution of a non-oxidizing acid on a metal, comprising maintaining an effective amount of the corrosion inhibitor as defined in claim 1 in said solution.
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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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |