IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0214079
(1980-12-08)
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발명자
/ 주소 |
- Cunningham William J. (Williamsville NY) Smith Addison M. (Buffalo NY) Wiles Robert A. (Hamburg NY)
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출원인 / 주소 |
- Allied Chemical Corporation (Morris Township, Morris County NJ 02)
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인용정보 |
피인용 횟수 :
5 인용 특허 :
0 |
초록
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The present invention provides a novel process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of the 1,1-isomer. The process includes contacting, in the vapor phase, an organic feed composition containing a major amount of the 1,2-isomer and a minor amount of 1,1-isomer with
The present invention provides a novel process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of the 1,1-isomer. The process includes contacting, in the vapor phase, an organic feed composition containing a major amount of the 1,2-isomer and a minor amount of 1,1-isomer with hydrogen in the presence of a hydrodechlorination catalyst. The process selectively degrades the 1,1-isomer. Also provided is a process for producing high purity 1,2-isomer.
대표청구항
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A process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of 1,1-dichloro-1,2,2,2-tetrafluoroethane from a mixture comprising 1,2-dichloro-1,1,2,2-tetrafluoroethane and 1,1-dichloro-1,2,2,2-tetrafluoroethane, said process comprising contacting, in the vapor phase, a feed comp
A process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of 1,1-dichloro-1,2,2,2-tetrafluoroethane from a mixture comprising 1,2-dichloro-1,1,2,2-tetrafluoroethane and 1,1-dichloro-1,2,2,2-tetrafluoroethane, said process comprising contacting, in the vapor phase, a feed composition comprising a major amount of 1,2-dichloro-1,1,2,2-tetrafluoroethane and a minor amount of 1,1-dichloro-1,2,2,2-tetrafluoroethane with hydrogen in the presence of a hydrodechlorination catalyst for a selected time ranging from about 2-6 seconds; the proportion of hydrogen ranging from an amount at least slightly in excess, on a molar basis, of the concentration of 1,1-dichloro-1,2,2,2-tetrafluoroethane in said feed composition, to an amount about substantially equimolar to said feed composition; said contacting being carried out at a selected temperature suitable for the hydrodechlorination catalyst; whereby substantially all 1,1-dichloro-1,2,2,2-tetrafluoroethane is selectively degraded so as to provide 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of 1,1-dichloro-1,2,2,2-tetrafluoroethane, as a product.
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