Patent US4092370A successfully refreshed from Google Patents.
US4092370A
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Process for producing tetrachloroethylene from tetrachloromethane using a molten salt catalyst
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1975-09-30
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Granted: 1978-05-30
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Expires: 1995-09-30
Abstract
Abstract Processes for producing tetrachloromethane and tetrachlorethylene are disclosed. Tetrachloromethane is produced by contacting a chlorinated feed material having two to four carbon atoms, and optionally including oxygen, hydrogen chloride or chlorine, with a molten salt catalyst of copper chloride together with an alkali metal or alkaline earth metal chloride at a temperature between 450 DEG and 750 DEG C. Tetrachloroethylene is produced by contacting tetrachloromethane, optionally together with chlorinatable material, oxygen and hydrogen chloride, with a similar catalyst at a temperature of 430 DEG to 650 DEG C.
Inventors
- 👤 Eiichi Ichiki
- 👤 Dazuo Kida
- 👤 Satoshi Kamata
- 👤 Yoshinori Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269; B; B01; B01J; B01J27/00; B01J27/06; C07C17/266; C07C17/361
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A process for producing tetrachloroethylene which comprises contacting a feed material selected from the group consisting of (1) tetrachloromethane; (2) tetrachloromethane; and a chlorinatable material; (3) tetrachloromethane; a chlorinatable material; and oxygen and (4) tetrachloromethane; a chlorinatable material; oxygen; and hydrogen chloride, chlorine, or a mixture of hydrogen chloride and chlorine; at a temperature of from about 430° C to 650° C with a salt catalyst which is molten at the reaction temperature, said molten salt catalyst consisting essentially of a mixture of a copper chloride and at least one chloride of an alkali metal or an alkaline earth metal, and recovering the tetrachloroethylene.
Claim 2
Dependent Claim
104 words
A process for producing tetrachloroethylene which comprises contacting a feed material selected from the group consisting of (1) tetrachloromethane; (2) tetrachloromethane; and a chlorinatable material; (3) tetrachloromethane; a chlorinatable material; and oxygen and (4) tetrachloromethane; a chlorinatable material; oxygen; and hydrogen chloride, chlorine, or a mixture of hydrogen chloride and chlorine; at a temperature of from about 430° C to 650° C with a salt catalyst which is molten at the reaction temperature, said molten salt catalyst consisting essentially of a mixture of a copper chloride and at least one chloride of an alkali metal or an alkaline earth metal, and recovering the tetrachloroethylene.
Claim 3
Dependent Claim
51 words
The process of claim 1, wherein said molten salt catalyst additionally includes at least one chloride of an alkali metal or an alkaline earth metal, and at least one chloride of a second metal selected from the group consisting of iron, zinc, manganese, chromium, nickel, palladium and a rare earth metal.
Claim 4
Dependent Claim
27 words
The process of claim 2, wherein the amount of said chloride of said second metal in said molten salt catalyst is from 5 to 50 mole %.
Claim 5
Dependent Claim
38 words
The process of claim 2, wherein said alkali metal chloride, alkaline earth metal chloride or mixture thereof is present in said molten salt catalyst in an amount of less than 3 moles per mole of said copper chloride.
Claim 6
Dependent Claim
19 words
The process of claim 2, wherein said amount is less than 2 moles per mole of said copper chloride.
Claim 7
Dependent Claim
10 words
The process of claim 2, wherein said oxygen is air.
Claim 8
Dependent Claim
18 words
The process of claim 2, wherein said alkali metal chloride is lithium chloride, sodium chloride or potassium chloride.
Claim 9
Dependent Claim
14 words
The process of claim 2, wherein said alkaline earth metal chloride is magnesium chloride.
Claim 10
Dependent Claim
16 words
The process of claim 2, wherein said molten salt catalyst additionally contains silver chloride or thallium.
References Cited (Backward Citations)
US1930350A
Cited
FR844300A
Cited
US2727076A
Cited
US2498552A
Cited
US2890250A
Cited
GB907435A
Cited
GB1213402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |