US4200518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger anti-foulant
Assignee: Chevron USA Inc
•
Filing: 1979-03-22
•
Granted: 1980-04-29
•
Expires: 1999-03-22
Abstract
Abstract Disclosed is a process for reducing the fouling in a heat exchanger in which a hydrocarbon stream is heated or cooled as it passes through the heat exchanger. From 1 to 500 parts per million of a polyalkylene amine is added to the stream to reduce fouling.
Inventors
- 👤 Paul K. Mulvany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:13
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10G; C10G9/00; C10G9/14; C10G9/16; C10L1/14; C10L1/22; C10L1/222; C10L1/2222; C10L1/2225; C10L1/232
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
A process for reducing heat exchanger fouling in which a liquid hydrocarbon stream is passed through a heat exchanger at a temperature from 0° to 1500° F. wherein from 1 to 500 parts per million of a polyalkylene amine is added to said hydrocarbon stream.
Claim 2
Dependent Claim
45 words
A process for reducing heat exchanger fouling in which a liquid hydrocarbon stream is passed through a heat exchanger at a temperature from 0° to 1500° F. wherein from 1 to 500 parts per million of a polyalkylene amine is added to said hydrocarbon stream.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said stream is crude oil.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein 5 to 99 parts per million of said polyalkylene amine is added to said stream.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein 10 to 49 parts per million of said polyalkylene amine is added to said stream.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein said hydrocarbon stream is passed through said heat exchanger at a temperature from 50° to 500° F.
Claim 7
Dependent Claim
20 words
The process of claim 4 wherein said polyalkylene amine has a molecular weight in the range of 220 to 2,700.
Claim 8
Dependent Claim
13 words
The process of claim 4 wherein said polyalkylene amine is a polybutene amine.
Claim 9
Dependent Claim
24 words
The process of claim 7 wherein said polyalkylene amine comprises a polyisobutylene amine having a molecular weight in the range of 1,000 to 1,500.
Claim 10
Dependent Claim
16 words
The process of claim 8 wherein said heat exchanger is a shell and tube heat exchanger.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |