US3869520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dehydrohalogenation of trichloroethane to vinylidene chloride
Assignee: ConocoPhillips Co
•
Filing: 1972-06-21
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Granted: 1975-03-04
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Expires: 1992-06-21
Abstract
Abstract Vinylidene chloride may be produced by reacting trichloroethane with an alkali metal or alkaline earth metal hydroxides or carbonates in an aqueous medium at low temperatures in the presence of a reaction aid.
Inventors
- 👤 Ronnie D Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:37
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/25
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
A PROCESS FOR PRODUCING VINYLIDENE CHLORIDE WHICH COMPRISES REACTING TRICHLOROETHANE WITH AN ALKALI METAL OR ALKALINE EARTH METAL HYDROXIDE OR CARBONATE IN AN AQUEOUS MEDIUM AT TEMPERATURE AS LOW AS 0*C IN THE PRESENCE OF A REACTION AID, SAID REACTION AID BEING ACTIVATED CARBON, ACTIVATED CHARCOAL, ACTIVATED ALUMINA, OR POROUS SILICA.
Claim 2
Dependent Claim
51 words
A PROCESS FOR PRODUCING VINYLIDENE CHLORIDE WHICH COMPRISES REACTING TRICHLOROETHANE WITH AN ALKALI METAL OR ALKALINE EARTH METAL HYDROXIDE OR CARBONATE IN AN AQUEOUS MEDIUM AT TEMPERATURE AS LOW AS 0*C IN THE PRESENCE OF A REACTION AID, SAID REACTION AID BEING ACTIVATED CARBON, ACTIVATED CHARCOAL, ACTIVATED ALUMINA, OR POROUS SILICA.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the reaction aid is employed in an amount of at least 0.1 weight percent based on the trichloroethane.
Claim 4
Dependent Claim
11 words
A process according to claim 1 wherein the trichloroethane is 1,1,2-trichloroethane.
Claim 5
Dependent Claim
36 words
A process according to claim 1 wherein the mol ratio of alkali metal or alkaline earth metal hydroxide or carbonate to trichloroethane is in the range of about ten to one to about one to ten.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein an alkali metal hydroxide is employed.
Claim 7
Dependent Claim
14 words
A process acording to claim 5 wherein the alkali metal hydroxide is sodium hydroxide.
Claim 8
Dependent Claim
16 words
A process according to claim 1 wherein the reaction aid is activated carbon or activated charcoal.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein the reaction aid is activated alumina.
References Cited (Backward Citations)
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Cited
US2404927A
Cited
US2561516A
Cited
US2666771A
Cited
US3065280A
Cited
US3290398A
Cited
US3240834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |