IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0961869
(1992-10-15)
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발명자
/ 주소 |
- Ohno Hiromoto (Kawasaki JPX) Ohi Toshio (Kawasaki JPX) Nakayama Hidetoshi (Kawasaki JPX) Muramaki Kazuo (Kawasaki JPX)
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출원인 / 주소 |
- Showa Denko Kabushiki Kaisha (Tokyo JPX 03)
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인용정보 |
피인용 횟수 :
11 인용 특허 :
0 |
초록
▼
In the production of 1,1,1,2-tetrafluoroethane by reacting trichloroethylene with hydrogen fluoride, crude 1,1,1,2-tetrafluoroethane is highly purified by a method comprising subjecting the crude 1,1,1,2-tetrafluoroethane to preliminary purification to remove hydrogen chloride to a concentration of
In the production of 1,1,1,2-tetrafluoroethane by reacting trichloroethylene with hydrogen fluoride, crude 1,1,1,2-tetrafluoroethane is highly purified by a method comprising subjecting the crude 1,1,1,2-tetrafluoroethane to preliminary purification to remove hydrogen chloride to a concentration of not higher than 2%, and bring the preliminarily purified 1,1,1,2-tetrafluoroethane containing one or more unsaturated impurities and hydrogen fluoride in an amount at least equimolar to the unsaturated impurities into contact with a fluorination catalyst in a vapor phase to decrease the content of the unsaturated impurities.
대표청구항
▼
A method for the purification of crude 1,1,1,2-tetrafluoroethane produced by reacting trichloroethylene with hydrogen fluoride, comprising bringing low hydrogen chloride content 1,1,1,2-tetrafluoroethane containing unsaturated impurities and having a concentration of hydrogen chloride of not higher
A method for the purification of crude 1,1,1,2-tetrafluoroethane produced by reacting trichloroethylene with hydrogen fluoride, comprising bringing low hydrogen chloride content 1,1,1,2-tetrafluoroethane containing unsaturated impurities and having a concentration of hydrogen chloride of not higher than 2 mol %, and hydrogen fluoride in an amount at least equimolar to the unsaturated impurities, into contact with a fluorination catalyst in a vapor phase, so as to decrease the content of the unsaturated impurities, and comprising bringing the low hydrogen chloride content 1,1,1,2-tetrafluoroethane containing hydrogen fluoride into contact with the fluorination catalyst without further addition of hydrogen fluoride.
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