US4515708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitors
Assignee: Nalco Energy Services LP
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Filing: 1983-11-16
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Granted: 1985-05-07
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Expires: 2003-11-16
Abstract
Abstract Corrosion inhibition of metals is obtained treating a system with a corrosion-inhibiting amount, preferably 1 to 10000 ppm, of an optionally-substituted beta -pyridyl-ethylamine or a salt thereof, which may be prepared by reacting an amine with a vinylpyridine, preferably in the presence of an acidic catalyst such as acetic acid. The beta -pyridyl-ethylamine is a compound of the general formula: <IMAGE> wherein R is an alkyl, aryl, aralkyl, alkaryl, halo or amino group of a group -COX where X is hydrogen, alkyl, aryl, hydroxy, alkoxy, aryloxy, amino or halo group, n is zero or an integer from 1 to 4, and R1 and R2, which may be the same or different, each represent a hydrogen atom, an optionally substituted hydrocarbyl radical, an alkylamino radical, a heterocyclic radical or a group <IMAGE> or R1 and R2 with the intervening nitrogen atom together represent a saturated or unsaturated heterocyclic ring optionally containing one or more additional heteroatoms.
Inventors
- 👤 John A. Haslegrave
- 👤 Daniel S. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:36
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
A method of inhibiting corrosion of metals, which method comprises treating a metal containing system where metals are susceptible to corrosion with a corrosion-inhibiting amount ranges from 1 to 10,000 ppm (by weight) of the fluid within the system of a substituted β-pyridylethylamine or a salt thereof of the general formula: ##STR11## wherein R is an alkyl, aryl, aralkyl, alkaryl, halo or amino group or a group --COX where X is hydrogen, alkyl, aryl, hydroxy, alkoxy, aryloxy, amino or halo group, n is zero or an integer from 1 to 4, and R 1 and R 2 , which may be the same or different, each represent a hydrogen atom, an optionally substituted hydrocarbyl radical, an alkylamino radical, a heterocyclic radical or a group ##STR12## or R1 and R2 with the intervening nitrogen atom together represent a saturated or unsaturated heterocyclic ring optionally containing one or more additional heteroatoms.
Claim 2
Independent Claim
149 words
A method of inhibiting corrosion of metals, which method comprises treating a metal containing system where metals are susceptible to corrosion with a corrosion-inhibiting amount ranges from 1 to 10,000 ppm (by weight) of the fluid within the system of a substituted β-pyridylethylamine or a salt thereof of the general formula: ##STR11## wherein R is an alkyl, aryl, aralkyl, alkaryl, halo or amino group or a group --COX where X is hydrogen, alkyl, aryl, hydroxy, alkoxy, aryloxy, amino or halo group, n is zero or an integer from 1 to 4, and R 1 and R 2 , which may be the same or different, each represent a hydrogen atom, an optionally substituted hydrocarbyl radical, an alkylamino radical, a heterocyclic radical or a group ##STR12## or R1 and R2 with the intervening nitrogen atom together represent a saturated or unsaturated heterocyclic ring optionally containing one or more additional heteroatoms.
Claim 3
Dependent Claim
102 words
The method of claim 1, in which the β-pyridyl-ethylamine is a compound of the general formula: ##STR13## (wherein R 4 and R 5 , which may be the same or different, each represent a hydrogen atom (provided that both R 4 and R 5 do not represent hydrogen) a straight or branched chain alkyl group containing from 1 to 22 carbon atoms, a benzyl group or an alkylamino group --(A--NH) m --R 3 , or R 4 , R 5 and the intervening nitrogen atom to which they are bonded together for a piperidine, morpholine, pyridine or pyrrole radical) and salts thereof.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein said compound is a 2- or 4-substituted pyridine.
Claim 5
Dependent Claim
34 words
The method of claim 4 wherein R 4 represents hydrogen or a group ##STR14## and R 5 represents a benzyl group or a straight chain alkyl group having from 12 to 18 carbon atoms.
Claim 6
Dependent Claim
33 words
The method of claim 3 wherein R 4 represents hydrogen, R 5 represents a group --A--NH--R 3 and R 3 represents a straight chain alkyl group having from 12 to 18 carbon atoms.
Claim 7
Dependent Claim
24 words
The method of claim 3 in which R 4 represents hydrogen and R 5 represents (ANH) m H and m is 2 or 3.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein said β-pyridyl-ethylamine is employed in the form of a salt with hydrochloric acid, acetic acid, propionic acid or a long chain fatty acid.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein said β-pyridyl-ethylamine is introduced into the system with a suitable vehicle.
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) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |