US4089789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitors
Assignee: Richardson Co
•
Filing: 1974-10-11
•
Granted: 1978-05-16
•
Expires: 1994-10-11
Abstract
Abstract As improved corrosion inhibitors, reaction products of alkylene oxides and blocked phenols wherein two substituents of the phenol are non-oxyalkylatable, saturated tertiary-amino alkylene groups, and acid-stable salts of these products.
Inventors
- 👤 Thaddeus M. Muzyczko
- 👤 Samuel Shore
- 👤 Jerome A. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:38
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/04; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
143 words
A method for inhibiting corrosion of ferrous metal in an acid system which comprises utilizing in such system a minor but effective amount of an inhibitor comprising an oxyalkylated phenolic composition or the acid stable salt thereof, said composition being the reaction product of an alkylene oxide having from 2 to 14 carbon atoms and a phenolic compound having two non-oxyalkylatable, saturated teriary-amino alkylene groups with the formula ##STR5## wherein R is alkyl having 1 to about 18 carbon atoms or alkaryl with about 7 to about 12 carbon atoms, R 1 and R 2 are each alkyl having from 1 to about 9 carbon atoms and R 3 is alkylene having 1 to about 3 carbon atoms, said reaction product having been formed by reacting from about 1 to about 25 moles of said alkylene oxide per mole of the phenolic compound.
Claim 2
Independent Claim
143 words
A method for inhibiting corrosion of ferrous metal in an acid system which comprises utilizing in such system a minor but effective amount of an inhibitor comprising an oxyalkylated phenolic composition or the acid stable salt thereof, said composition being the reaction product of an alkylene oxide having from 2 to 14 carbon atoms and a phenolic compound having two non-oxyalkylatable, saturated teriary-amino alkylene groups with the formula ##STR5## wherein R is alkyl having 1 to about 18 carbon atoms or alkaryl with about 7 to about 12 carbon atoms, R 1 and R 2 are each alkyl having from 1 to about 9 carbon atoms and R 3 is alkylene having 1 to about 3 carbon atoms, said reaction product having been formed by reacting from about 1 to about 25 moles of said alkylene oxide per mole of the phenolic compound.
Claim 3
Dependent Claim
89 words
The method of claim 1 wherein said oxyalkylated phenolic composition includes up to 50 weight percent of the reaction product of an alkylene oxide having 2-14 carbon atoms and a monoamino phenolic compound of the formula ##STR6## wherein R, R 1 , R 2 and R 3 are defined in claim 21 and Y is alkyl of 1 to 12 carbon atoms, said oxyalkylated monoamino phenolic composition having been formed by reacting from about 1 to about 25 moles of said alkylene oxide per mole of the phenolic compounds.
Claim 4
Dependent Claim
38 words
A method for corrosion inhibition in the treatment of oil wells comprising incorporating the inhibitor of claim 1 in a liquid hydrocarbon medium in a minor but effective amount and thereafter injecting said medium into an oil well.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said inhibitor includes mixtures of said salts and the composition.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein R 1 and R 2 are each alkyl with about 1-3 carbon atoms and R 3 is alkylene with 1 carbon atom.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein R 1 and R 2 are methyl.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein R is alkyl with about 1-12 carbon atoms.
Claim 9
Dependent Claim
46 words
The method of claim 1 wherein said salt is derived from the reaction of ZA and the oxyalkylated phenolic composition which is formed from the reaction of the ethylene oxide and the phenol, wherein Z is hydrogen or alkyl and A is an anion forming group.
Claim 10
Dependent Claim
9 words
The method of claim 8 wherein ZA is HCl.
Claim 11
Dependent Claim
9 words
The method of claim 8 wherein ZA is methylchloride.
Claim 12
Dependent Claim
9 words
The method of claim 8 wherein ZA is butylchloride.
Claim 13
Dependent Claim
13 words
The method of claim 8 wherein ZA is H 2 SO 4 .
Claim 14
Dependent Claim
11 words
The method of claim 8 wherein ZA is CH 3 COOH.
Claim 15
Dependent Claim
10 words
The method of claim 8 wherein ZA is citric acid.
Claim 16
Dependent Claim
13 words
The method of claim 8 wherein ZA is H 3 PO 4 .
Claim 17
Dependent Claim
10 words
The method of claim 8 wherein ZA is methyl bromide.
Claim 18
Dependent Claim
14 words
The method of claim 8 including mixtures of said salts and the reaction products.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |