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US3725486A
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Process for making 1,1-dichlorethylene from 1,1,2-trichlorethane
Assignee: Detrex Corp
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Filing: 1969-05-23
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Granted: 1973-04-03
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Expires: 1989-05-23
Abstract
Abstract A dehydrochlorination process for the formation of 1,1dichlorethylene from 1,1,2-trichlorethane in which an aqueous emulsion of 1,1,2-trichlorethane and an alkaline earth metal hydroxide is made to which there is added an aqueous solution of an alkali metal hydroxide in stoichiometric amount, thereby forming 1,1-dichlorethylene, which is continuously removed.
Inventors
- 👤 Cracken W Mc
- 👤 W Petering
- 👤 C Kircher
- 👤 P Pinchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:04
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/25
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
The process of claim 1 in which the alkaline earth metal hydroxide is calcium hydroxide.
Claim 2
Dependent Claim
15 words
The process of claim 1 in which the alkaline earth metal hydroxide is magnesium hydroxide.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the alkali metal hydroxide is sodium hydroxide.
Claim 4
Dependent Claim
23 words
The process of claim 1 in which the alkaline earth metal hydroxide is calcium hydroxide and the alkali metal hydroxide is sodium hydroxide.
Claim 5
Dependent Claim
23 words
The process of claim 1 in which the alkaline earth metal hydroxide is magnesium hydroxide and the alkali metal hydroxide is sodium hydroxide.
Claim 6
Dependent Claim
19 words
The process of claim 1 in which the 1,1-dichlorethylene is continuously removed by steam distillation as the dehydrochlorination proceeds.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the dehydrochlorination is carried out at a pressure greater than atmospheric.
Claim 8
Dependent Claim
59 words
The process of claim 1 further characterized by the steps of withdrawing alkali metal chloride aqueous solution and alkaline earth metal hydroxide suspension, storing the withdrawn portion until the hydroxide settles to a stable layer, separating the aqueous solution from the concentrated suspension and then using the alkaline earth metal hydroxide to form additional aqueous emulsion in step A.
References Cited (Backward Citations)
US2291375A
Cited
US3290398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |