US4737159A
Expired / Lapsed
US
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Corrosion inhibitor for liquid fuels
Assignee: Octel America Inc
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Filing: 1984-06-29
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Granted: 1988-04-12
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Expires: 2004-06-29
Abstract
Abstract A corrosion inhibitor for use in liquid hydrocarbon fuels or gasoline oxygenate blends is disclosed. The corrosion inhibitor contains from 35 to 70 wt % of a monoalkenylsuccinic acid wherein the alkenyl group has 8 to 18 carbon atoms, from about 30 to 65 wt % of an aliphatic or cycloaliphatic amine containing 2 to 12 carbon atoms and up to 50 wt % of total solvents consisting of aromatic hydrocarbons and alcohols of 1 to 4 carbons per molecule. The corrosion inhibitor can also be used in inhibited alcohol compositions such as those used in gasoline oxygenate blends.
Inventors
- 👤 Tayman A. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:22
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/16; C10L1/1616; C10L1/18; C10L1/182; C10L1/1822; C10L1/1824; C10L1/188; C10L1/1881; C10L1/1883; C10L1/22; C10L1/222; C10L1/2222; C10L1/2225; C10L1/223; C10L1/224; C10L1/232; C10L1/233; C10L1/2335
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
99 words
A corrosion inhibitor composition for liquid hydrocarbon fuels containing 1.0 to 10 volume percent of one or more alcohols comprising, by weight, (a) about 35% to 70% of at least one monoalkenylsuccinic acid in which the alkenyl group has 8 to 18 carbons; and (b) about 30% to 65% of an aliphatic or cycloaliphatic amine containing 2 to 12 carbon atoms in a hydrocarbon solvent consisting of an aromatic hydrocarbon, an alcohol containing 1 to 4 carbon atoms, or mixture thereof, the ratio of the hydrocarbon solvent to the total of (a) and (b) being about 15:85 to 50:50.
Claim 2
Dependent Claim
99 words
A corrosion inhibitor composition for liquid hydrocarbon fuels containing 1.0 to 10 volume percent of one or more alcohols comprising, by weight, (a) about 35% to 70% of at least one monoalkenylsuccinic acid in which the alkenyl group has 8 to 18 carbons; and (b) about 30% to 65% of an aliphatic or cycloaliphatic amine containing 2 to 12 carbon atoms in a hydrocarbon solvent consisting of an aromatic hydrocarbon, an alcohol containing 1 to 4 carbon atoms, or mixture thereof, the ratio of the hydrocarbon solvent to the total of (a) and (b) being about 15:85 to 50:50.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein the amine is selected from the group consisting of N,N-dimethylcyclohexylamine, morpholine or triethanolamine.
Claim 4
Dependent Claim
12 words
The composition of claim 2 wherein the monoalkenylsuccinic acid is dodecenylsuccinic acid.
Claim 5
Dependent Claim
10 words
The composition of claim 3 wherein the amine is triethanolamine.
Claim 6
Dependent Claim
10 words
The composition of claim 3 wherein the amine is morpholine.
Claim 7
Dependent Claim
10 words
The composition of claim 3 wherein the amine is N,N-dimethylcyclohexylamine.
Claim 8
Dependent Claim
15 words
The composition of claim 2 wherein the solvent is a mixture of methanol and xylene.
Claim 9
Dependent Claim
88 words
A composition comprising the composition of claim 2 and (i) a composition which is generally liquid, acylated polyalkylene polyamine which is substantially free of nitrogen containing cyclic groups and is of the formula ##STR13## wherein R is selected from H and ##STR14## at least two R groups are ##STR15## R 1 is C 9-21 saturated or unsaturated aliphatic hydrocarbyl, n is 2 or 3 and x is 2-6, wherein the ratio of the composition of (i) to the composition of claim 2 is from about 0.53:1 to 1.4:1.
Claim 10
Dependent Claim
21 words
The composition of claim 8 wherein, in composition (i), n is 2, x is 4 and R' is C 17 .
Claim 11
Dependent Claim
36 words
A composition comprising the composition of claim 2 and (i) a composition of a N,N'-di(sec. alkyl)-p-phenylenediamine, wherein the ratio of the composition of (i) to the composition of claim 2 is from about 0.42:1 to 2.0:1.
Claim 12
Dependent Claim
17 words
The composition of claim 10 wherein composition (i) is of the group N,N'-di(sec. butyl)-p-phenylenediamine, N,N'-di(isopropyl)-p-phenylenediamine, or N,N'-di(1,4-dimethylpentyl)-p-phenylenediamine.
Claim 13
Dependent Claim
62 words
A composition comprising the corrosion inhibitor composition of claim 1, composition (i) of claim 8, composition (i) of claim 10 and (i) a composition of N,N'-bis(salicylidene-polyamine), wherein the ratio of the composition (i) of claim 8 to the composition (i) of claim 10 to the composition (i) of this claim to the composition of claim 1 is from about 0.53:0.42:0.08:1 to 1.4:2.0:0.25:1.
Claim 14
Dependent Claim
35 words
An inhibited alcohol composition for use in making gasoline-oxygenate blends containing an alcohol of 1 to 4 carbon atoms and about 80 to 250 mg of the composition of claim 1 per liter of alcohol.
Claim 15
Dependent Claim
12 words
The inhibited alcohol composition of claim 13 wherein the alcohol is methanol.
Claim 16
Dependent Claim
39 words
An inhibited alcohol composition comprising the composition of claim 13 and from about 35 to 100 mg of a composition of at least one polymerized unsaturated aliphatic monocarboxylic acid having 16 to 18 carbon atoms per liter of alcohol.
Claim 17
Dependent Claim
21 words
The inhibited alcohol composition of claim 15 wherein the polymerized unsaturated aliphatic monocarboxylic acid is a polymerized tall oil fatty acid.
Claim 18
Dependent Claim
20 words
A gasoline oxygenate blend containing about 4 to 12.5 mg of the composition of claim 1 per liter of gasoline.
Claim 19
Dependent Claim
20 words
A gasoline oxygenate blend containing about one part of the composition of claim 15 or 16 to 20 parts gasoline.
Claim 20
Dependent Claim
93 words
A composition comprising (a) the corrosion inhibitor of claim 1; (b) a composition which is generally liquid, acylated polyalkylene polyamine which is substantially free of nitrogen containing cyclic groups and is of the formula ##STR16## wherein R is selected from H and ##STR17## at least two R groups are ##STR18## and R 1 is C 17 saturated or unsaturated aliphatic hydrocarbyl; (c) a composition selected from the group consisting of N,N'-di(sec. butyl)-p-phenylenediamine, N,N'-di(isopropyl)-p-phenylenediamine, and N,N'-di(1,4-dimethylpentyl)-p-phenylenediamine; and (d) a composition of N,N'-bis(salicylidene-1,2,-diaminopropane wherein the ratio of b:c:d:a is from about 0.53:0.42:0.08:1 to about 1.4:2.0:0.25:1.
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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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |