Patent US5006839A successfully refreshed from Google Patents.
Patent US3657121A successfully refreshed from Google Patents.
US3657121A
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US
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Purge for preventing pipeline contamination
Assignee: Chevron USA Inc
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Filing: 1970-04-01
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Granted: 1972-04-18
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Expires: 1990-04-01
Abstract
Abstract Surface active contaminants adsorbed on the interior surface of a pipeline can be desorbed therefrom and effectively removed by introducing into the line an effective quantity of wet aliphatic alcohol (C2-C4 alcohol) containing a small amount of either a dimer acid of a C16-C20 ethenoid fatty acid or a C4-C20 alkyl amine salt of a partially esterified phosphoric acid.
Inventors
- 👤 John J Gannon
- 👤 Enver Mehmedbasich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:46
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/032
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
17 words
The process of claim 1, wherein said water is present in from 2 to 15 volume percent.
Claim 2
Dependent Claim
10 words
The process of claim 1, wherein said alcohol is isopropanol.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said dimer acid is a dimer acid of linolenic acid.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein said dimer acid is the dimer acid of linoleic acid.
Claim 5
Dependent Claim
61 words
The process of claim 1, wherein the phosphate salt of the C4-C20 alkyl amine is of the general formula wherein R is an alkyl hydrocarbon radical of from six to 18 carbon atoms, R'' is an alkyl hydrocarbon radical of from six to 18 carbon atoms, and R'''' is an alkyl hydrocarbon of from six to 18 carbon atoms or hydrogen.
Claim 6
Dependent Claim
22 words
The process of claim 6, wherein R is a C12 alkyl hydrocarbon radical and R'' and R'''' are C13 alkyl hydrocarbon radicals.
Claim 7
Dependent Claim
84 words
A process for removing adsorbed surface active material on the internal surface of a pipeline used for the transportation of liquid petroleum fuels which comprises introducing into said pipeline in bulk, immediately after a tender of fuel containing a surface active material, from about 1 to 25 barrels of isopropanol containing from 1 to 20 volume percent of at least one of a dimer of a linoleic acid, or dodecyl amine salt of mono-or di-tridecyl phosphate and from 2 to 10 volume percent water.
Claim 8
Dependent Claim
53 words
A process according to claim 8 wherein said surface active material is aliphatic hydrocarbon substituted polyethylene polyamine of from two to 5 amine nitrogen atoms and said aliphatic hydrocarbon group is from 50 to 200 carbon atoms and wherein said surface active material was present in said fuel from 100 to 1,000 ppm.
References Cited (Backward Citations)
US2863904A
Cited
US2891909A
Cited
GB839112A
Cited
US3077929A
Cited
US3100784A
Cited
US3384466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |