US3686337A
Expired / Lapsed
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Method of reducing the halogen content of haloaromatics
Assignee: Individual
•
Filing: 1970-05-28
•
Granted: 1972-08-22
•
Expires: 1990-05-28
Abstract
Abstract Halobenzenes, halobiphenyls and halonaphthalenes are dehalogenated by heating the haloaromatic in the presence of a lower dialkanolamine or lower trialkanolamine for a time sufficient to give the desired reduction of the aromatic halogen content.
Inventors
- 👤 Kuo Yuan Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:41
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/23
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
12 words
The process of claim 1 wherein the alkanolamine is a lower trialkanolamine.
Claim 2
Dependent Claim
10 words
The process of claim 2 wherein the trialkanolamine is triethanolamine.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the polyhaloaromatic has only chlorine substituents.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the polyhaloaromatic is benzene containing at least three halogen atoms.
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein the molar ratio of the alkanolamine to the polyhaloaromatic is about 2 to about 4 moles of alkanolamine per equivalent of halogen to be removed from the polyhaloaromatic.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the temperature is about 125* to about 250*C.
References Cited (Backward Citations)
US2766295A
Cited
US3054830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |