Patent US3666656A successfully refreshed from Google Patents.
US3666656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for inhibiting fouling in a refinery process
Assignee: Texaco Inc
•
Filing: 1970-09-30
•
Granted: 1972-05-30
•
Expires: 1990-09-30
Abstract
Abstract Method of treating petroleum hydrocarbon liquids to inhibit the fouling of refinery process equipment involving the addition of an anti-fouling amount of an oil-soluble addition type copolymer containing in combined form as its essential monomeric components copolymerizable ethylenically unsaturated compounds each containing only one polymerizable ethylenic linkage, at least one of which component is amine free and contains from 4 to about 18 carbon atoms, one of the components contains a basic aminonitrogen in the side chain and one of the components contains a hydrocarbon-substituted-amide in the side chain.
Inventors
- 👤 Maurice E Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:40
CPC Classifications
C; C10; C10G; C10G75/00; C10G75/04; C10G7/00; C10G7/10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/224; C10L1/228; C10L1/2283; C10L1/234; C10L1/236; C10L1/2366
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
A method according to claim 1 in which said hydrocarbon liquid contains from about 0.0005 to 0.5 weight percent of said copolymer.
Claim 2
Dependent Claim
105 words
A method according to claim 1 in which said amine-free ethylenically unsaturated compound is represented by the formula: in which R is an aliphatic hydrocarbon radical having from 1 to 18 carbons, said basic amino nitrogen-containing ethylenically unsaturated compound is represented by the formula: in which R is an alkylene radical having from 2 to 4 carbon atoms and R'' and R'''' are hydrogen or an aliphatic hydrocarbon radical having from 1 to 8 carbon atoms, and said hydrocarbon-substituted amide compound is represented by the formula: in which R'' and R'''' are hydrogen or an aliphatic hydrocarbon radical having from 1 to 18 carbon atoms.
Claim 3
Dependent Claim
13 words
A method according to claim 1 in which said hydrocarbon liquid is kerosene.
Claim 4
Dependent Claim
14 words
A method according to claim 1 in which said hydrocarbon liquid is a naphtha.
Claim 5
Dependent Claim
15 words
A method according to claim 1 in which said hydrocarbon liquid is a gas oil.
Claim 6
Dependent Claim
15 words
A method according to claim 1 in which said hydrocarbon liquid is a crude oil.
Claim 7
Dependent Claim
42 words
A method according to claim 1 in which said hydrocarbon liquid being treated also contains an antifouling amount of an aldehyde-amine condensation product represented by the formula: in which R is a divalent hydrocarbyl radical having from 2 to 4 carbon atoms.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |