IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0874786
(2001-06-05)
|
우선권정보 |
GB-19950020644 (1995-10-10); GB-19950020645 (1995-10-10); GB-19960012117 (1996-06-10); GB-19960012118 (1996-06-10) |
발명자
/ 주소 |
- Ewing, Paul Nicholas
- Shields, Charles John
- Roberts, Christopher
|
출원인 / 주소 |
- Ineca Fluor Holdings Limited
|
대리인 / 주소 |
Cook, Alex, McFarron, Manzo, Cummings & Mehler, Ltd.
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
12 |
초록
▼
A process for separating and recovering hydrogen fluoride from a mixture with an organic compound especially a fluorine-containing compound by extraction with a solution of an alkali metal fluoride in hydrogen fluoride, phase separation and recovery. A process for producing a fluorine-containing org
A process for separating and recovering hydrogen fluoride from a mixture with an organic compound especially a fluorine-containing compound by extraction with a solution of an alkali metal fluoride in hydrogen fluoride, phase separation and recovery. A process for producing a fluorine-containing organic compound by fluorinating a starting material with hydrogen fluoride and similarly recovering hydrogen fluoride from the product stream. The solution may be anhydrous or aqueous.
대표청구항
▼
1. A process for the production of a fluorine-containing organic compound by reacting an organic starting material with hydrogen fluoride in the liquid phase or the gaseous phase in the presence of a fluorination catalyst to produce a product stream comprising an azeotropic or near azeotropic mixtur
1. A process for the production of a fluorine-containing organic compound by reacting an organic starting material with hydrogen fluoride in the liquid phase or the gaseous phase in the presence of a fluorination catalyst to produce a product stream comprising an azeotropic or near azeotropic mixture of the fluorine-containing organic compound and unreacted hydrogen fluoride, contacting the product stream with a solution of alkali metal fluoride of from about 20% to about 80% by weight in hydrogen fluoride, effecting phase separation of an upper phase comprising the fluorine-containing organic compound and a lower hydrogen fluoride phase containing alkali metal fluoride and recovering hydrogen fluoride from the lower hydrogen fluoride phase. 2. A process as claimed in claim 1 in which the organic compound comprises a hydrofluoroalkane, a hydrochlorofluoroalkane, a chlorofluoroalkane and/or a hydrofluro ether. 3. A process as claimed in claim 2 in which the organic compound is selected from one or more of an 1,1,1,2-tetrafluoroethane [HFC 134a], 1,1,2,2-tetrafluoroethane [HFC 134], chloro-1,1,1-trifluoroethane [CFC 133a], chlorotetrafluoroethane [HCFC124/124a], pentafluoroethane [HFC 125], difluoromethane [HFC 32], chlorodifluoromethane [HCFC 22] 1,1-difluoroethane [HFC 152a], 1,1,1-trifluoroethane [HFC 143a], 1,1,1,3,3 pentafluoropropane [HFC 245fa], 1,2,2,3,3-pentafluoropropane [HFC 245ca] and 1,1,1,2,3,3,3-heptafluoropropane [HFC 227ea], bis(fluoromethyl) ether [BFME], 1,1-difluorodimethyl ether, 1,1,1-trifluorodimethyl ether and pentafluorodimethyl ether. 4. A process as claimed in claim 1 in which the product stream is treated prior to contact with the solution of the alkali metal fluoride in hydrogen fluoride. 5. A process as claimed in claim 2 in which the product stream is treated prior to contact with the solution of the alkali metal fluoride in hydrogen fluoride. 6. A process as claimed in claim 3, in which the product stream is treated prior to contact with the solution of the alkali metal fluoride in hydrogen fluoride.
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