US4535194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing 1,1,2,3-tetrachloropropene
Assignee: Monsanto Co
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Filing: 1983-07-06
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Granted: 1985-08-13
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Expires: 2003-07-06
Abstract
Abstract A process is disclosed for preparing 1,1,2,3-tetrachloropropene comprising allylic rearrangement of 2,3,3,3-tetrachloropropene using a substantially anhydrous ferric chloride catalyst. Alternatively, 1,1,2,3-tetrachloropropene is prepared by dehydrochlorination of 1,1,1,2,3-pentachloropropane using a ferric chloride catalyst. Process schemes commencing with the preparation of the precursor 1,1,1,3-tetrachloropropane by reaction of ethylene with carbon tetrachloride are also disclosed.
Inventors
- 👤 Scott S. Woodard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:06
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/272; C07C17/275; C07C17/013; C07C17/04; C07C17/25; C07C17/35; C07C17/358; C07C17/38; C07C17/383; C07C17/386; C07C21/00; C07C21/02; C07C21/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A process for producing 1,1,2,3-tetrachloropropene comprising the steps of: preparing 1,1,1,3-tetrachloropropane by reacting ethylene with carbon tetrachloride in the presence of both a source of metallic iron that is effective as an activator for the reaction, and a promoter for the reaction, said promoter being selected from phosphorus (V) compounds containing a phosphoryl group; dehydorchlorinating said 1,1,1,3-tetrachloropropane to produce a mixture of 1,1,3- and 3,3,3-trichloropropenes; chlorinating at least one of the trichloropropenes obtained by said dehydrochlorination of 1,1,1,3-tetrachloropropane to produce 1,1,1,2,3-pentachloropropane; dehydrochlorinating the 1,1,1,2,3-pentachloropropane to produce a mixture of 1,1,2,3- and 2,3,3,3-tetrachloropropenes; and contacting the mixture of tetrachloropropenes with a rearrangement catalyst, thereby converting the 2,3,3,3-tetrachloropropene content thereof to 1,1,2,3-tetrachloropropene.
Claim 2
Dependent Claim
110 words
A process for producing 1,1,2,3-tetrachloropropene comprising the steps of: preparing 1,1,1,3-tetrachloropropane by reacting ethylene with carbon tetrachloride in the presence of both a source of metallic iron that is effective as an activator for the reaction, and a promoter for the reaction, said promoter being selected from phosphorus (V) compounds containing a phosphoryl group; dehydorchlorinating said 1,1,1,3-tetrachloropropane to produce a mixture of 1,1,3- and 3,3,3-trichloropropenes; chlorinating at least one of the trichloropropenes obtained by said dehydrochlorination of 1,1,1,3-tetrachloropropane to produce 1,1,1,2,3-pentachloropropane; dehydrochlorinating the 1,1,1,2,3-pentachloropropane to produce a mixture of 1,1,2,3- and 2,3,3,3-tetrachloropropenes; and contacting the mixture of tetrachloropropenes with a rearrangement catalyst, thereby converting the 2,3,3,3-tetrachloropropene content thereof to 1,1,2,3-tetrachloropropene.
Claim 3
Dependent Claim
25 words
A process as set forth in claim 1 wherein said phosphorus (V) compound is selected from the group consisting of alkyl phosphates and alkyl phosphonates.
Claim 4
Dependent Claim
52 words
A process as set forth in claim 1 wherein the reaction between ethylene and carbon tetrachloride is carried out in a reaction system comprising a liquid phase in contact with said source of metallic iron, said liquid phase comprising carbon tetrachloride and said promoter, said promoter being compatible with said carbon tetrachloride.
Claim 5
Dependent Claim
22 words
A process as set forth in claim 3 wherein said liquid phase contains ferric chloride prior to the initiation of said reaction.
Claim 6
Dependent Claim
24 words
A process as set forth in claim 4 wherein said phosphorus (V) compound is initially present in molar excess with respect to ferric chloride.
Claim 7
Dependent Claim
15 words
A process as set forth in claim 1 wherein said rearrangement catalyst comprises ferric chloride.
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |