Patent US5526316A successfully refreshed from Google Patents.
Patent US3923914A successfully refreshed from Google Patents.
US3923914A
Expired / Lapsed
US
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Chemical process
Assignee: Ethyl Corp
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Filing: 1973-07-02
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Granted: 1975-12-02
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Expires: 1993-07-02
Abstract
Abstract A process is disclosed for preparing dibromomethane from the reaction of, in the presence of an inert solvent, alkali metal bromide and dihalomethane.
Inventors
- 👤 Paul Kobetz
- 👤 Kenneth L Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:03
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/04; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/208
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A CATALYST FREE PROCESS FOR THE PRODUCTION OF DIBROMOMETHANE AND BY-PRODUCT ALKALI METAL CHLORIDE COMPRISING REACTING AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 100* TO ABOUT 175*C AND IN THE PRESENCE OF AN INERT SOLVENT, ALKALI METAL BROMIDE AND DIHALOMETHANE WHEREIN AT LEAST ONE OF THE HALOGEN CONSTITUENTS OF THE DIHALOMETHANE IS CHLORINE AND THE REMAINING HALOGEN IS EITHER CHLORINE OR BROMINE, AND THE ALKALI METAL CONSTITUENT OF THE ALKALI METAL BROMIDE HAS AN ATOMIC NUMBER GREATER THAN 3 AND WHEREIN THE DIBROMOMETHANE AND REACTANTS ARE SOLUBLE IN THE SOLVENT BUT IN WHICH SOLVENT THE ALKALI METAL BY-PRODUCT IS SUBSTANTIALLY INSOLUBLE AND THE SOLVENT CONSISTS ESSENTIALLY OF A MIXTURE OF MONOALKYL ETHER OF ALKYLENE GLYCOL AND WATER IN A VOLUME RATIO WITHIN THE RANGE OF FROM ABOUT 1:1 TO ABOUT 3:1 OF THE MONOALKYL ETHER OF ALKYLENE GLYCOL TO WATER.
Claim 2
Dependent Claim
142 words
A CATALYST FREE PROCESS FOR THE PRODUCTION OF DIBROMOMETHANE AND BY-PRODUCT ALKALI METAL CHLORIDE COMPRISING REACTING AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 100* TO ABOUT 175*C AND IN THE PRESENCE OF AN INERT SOLVENT, ALKALI METAL BROMIDE AND DIHALOMETHANE WHEREIN AT LEAST ONE OF THE HALOGEN CONSTITUENTS OF THE DIHALOMETHANE IS CHLORINE AND THE REMAINING HALOGEN IS EITHER CHLORINE OR BROMINE, AND THE ALKALI METAL CONSTITUENT OF THE ALKALI METAL BROMIDE HAS AN ATOMIC NUMBER GREATER THAN 3 AND WHEREIN THE DIBROMOMETHANE AND REACTANTS ARE SOLUBLE IN THE SOLVENT BUT IN WHICH SOLVENT THE ALKALI METAL BY-PRODUCT IS SUBSTANTIALLY INSOLUBLE AND THE SOLVENT CONSISTS ESSENTIALLY OF A MIXTURE OF MONOALKYL ETHER OF ALKYLENE GLYCOL AND WATER IN A VOLUME RATIO WITHIN THE RANGE OF FROM ABOUT 1:1 TO ABOUT 3:1 OF THE MONOALKYL ETHER OF ALKYLENE GLYCOL TO WATER.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the alkyl constituent and the alkylene constituent of the monoalkyl ether of alkylene glycol each contain up to 3 carbon atoms.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the monoalkyl ether of alkylene glycol is monoethyl ether of ethylene glycol or monoethyl ether of diethylene glycol.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the dihalomethane is methylene chloride.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the alkali metal bromide is sodium bromide or potassium bromide.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the alkali metal bromide is sodium bromide supplied as aqueous sodium bromide.
Claim 8
Dependent Claim
22 words
The process of claim 1, wherein the alkali metal bromide is initially present in amounts of about two times the stoichiometric amount.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the temperature is within the range of from about 130* to about 160*C.
Claim 10
Dependent Claim
24 words
The process of claim 8 wherein the monoalkyl ether of alkylene glycol is monoethyl ether of ethylene glycol or monoethyl ether of diethylene glycol.
Claim 11
Dependent Claim
71 words
The process of claim 1 wherein the alkali metal bromide is initially present in an amount of about 2 times the stoichiometric amount, the alkali metal bromide is sodium bromide or potassium bromide, the monoalkyl ether of alkylene glycol is monoethyl ether of ethylene glycol or monoethylene ether of diethylene glycol, the temperature is within the range of from about 130* to about 160*C, and wherein the dihalomethane is methylene chloride.
References Cited (Backward Citations)
US2553518A
Cited
US2675413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |