US3779905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adding corrosion inhibitor to top of crude oil still
Assignee: Universal Oil Products Co
•
Filing: 1971-09-20
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Granted: 1973-12-18
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Expires: 1991-09-20
Abstract
Abstract Avoiding corrosion by HCl of overhead condensing equipment from a crude column by injecting an amine containing at least 7 carbon atoms into the reflux being returned to the upper portion of the crude column. An amine hydrochloride is formed which is nonvolatile and hydrocarbon soluble. Accordingly, it will be withdrawn from a lower section of the column and will not pass overhead into the communicating condensing equipment.
Inventors
- 👤 R Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:33
CPC Classifications
C; C10; C10G; C10G7/00; C10G7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The method of claim 1 in which said amine compound is injected into the reflux stream being returned to the upper portion of said fractionator.
Claim 2
Dependent Claim
17 words
The method of claim 1 in which steam is introduced into a lower portion of said fractionator.
Claim 3
Dependent Claim
50 words
The method of claim 1 in which said polymeric reaction product is formed at a temperature of from about 60* F. to about 300* F. by the reaction of from 1 to about 2 mole proportions of an amine with from about 1 to about 1.5 mole proportions of epihalohydrin.
Claim 4
Dependent Claim
16 words
The method of claim 4 wherein said amine reacted with said epichlorohydrin is an aliphatic monoamine.
Claim 5
Dependent Claim
25 words
The method of claim 4 wherein said amine reacted with said epichlorohydrin is an N-alkyl-1,3-diaminopropane containing 4 to about 50 carbon atoms in said alkyl.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |