US5107040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrohalogenation using magnesium hydroxide
Assignee: Dow Chemical Co
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Filing: 1991-05-15
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Granted: 1992-04-21
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Expires: 2011-05-15
Abstract
Abstract A process comprising contacting a solvent, magnesium hydroxide, and a halogenated hydrocarbon at a pressure sufficient to keep the solvent and the halogenated hydrocarbon under liquid conditions, and a temperature greater than 150° C. under conditions suitable to dehydrohalogenate the halogenated hydrocarbon, and recovering the dehydrohalogenated product.
Inventors
- 👤 Joseph F. Repman
- 👤 Tarver G. Snedecor, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:22
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/25
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A process comprising contacting a solvent, magnesium hydroxide, and a halogenated hydrocarbon selected from the group consisting of chloroethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, pentachloroethane, and mixtures thereof at a pressure sufficient to keep the solvent and the halogenated hydrocarbon in the liquid phase, and a temperature greater than 150° C. under conditions suitable to dehydrohalogenate the halogenated hydrocarbon, and recovering the dehydrohalogenated product.
Claim 2
Dependent Claim
65 words
A process comprising contacting a solvent, magnesium hydroxide, and a halogenated hydrocarbon selected from the group consisting of chloroethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, pentachloroethane, and mixtures thereof at a pressure sufficient to keep the solvent and the halogenated hydrocarbon in the liquid phase, and a temperature greater than 150° C. under conditions suitable to dehydrohalogenate the halogenated hydrocarbon, and recovering the dehydrohalogenated product.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the halogenated hydrocarbon is 1,1,2-trichloroethane.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the solvent is water.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the pressure is between about 200 psig and 500 psig.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the pressure is between about 250 psig and 400 psig.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the temperature is between about 150° C. and 250° C.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein the temperature is between about 175° C. and 225° C.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein the molar ratio of magnesium hydroxide to halogenated hydrocarbon is between about 1:1 and 10:1.
Claim 10
Dependent Claim
68 words
A process which comprises contacting water, 1,1,2-trichloroethane, and magnesium hydroxide at a pressure between about 250 psig and 400 psig and a temperature between about 175 ° C. and 225° C., the molar ratio of magnesium hydroxide to 1,1,2-trichloroethane greater than 1:1, the weight percentage of magnesium hydroxide to water between about 10 and 50, under conditions suitable to dehydrohalogenate 1,1,2-trichloroethane, and recovering the vinylidene chloride so formed.
Claim 11
Dependent Claim
68 words
A process which comprises contacting water, 1,1,2-trichloroethane, and magnesium hydroxide at a pressure between about 250 psig and 400 psig and a temperature between about 175 ° C. and 225° C., the molar ratio of magnesium hydroxide to 1,1,2-trichloroethane greater than 1:1, the weight percentage of magnesium hydroxide to water between about 10 and 50, under conditions suitable to dehydrohalogenate 1,1,2-trichloroethane, and recovering the vinylidene chloride so formed.
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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) | 1995-04-21 | 1995-10-21 | 1996-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-21 | 1999-10-21 | 2000-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-21 | 2003-10-21 | 2004-04-21 | $7700.00 | Window Closed / Lapsed |