Processes for the purification and use of 2-chloro-1,1,1,2,3,3,3-heptafluoropropane and zeotropes thereof with HF
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0283449
(1999-04-01)
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발명자
/ 주소 |
- Miller, Ralph Newton
- Rao, V. N. Mallikarjuna
- Swearingen, Steven H.
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출원인 / 주소 |
- E. I. du Pont de Nemours and Company
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인용정보 |
피인용 횟수 :
3 인용 특허 :
5 |
초록
▼
A process is disclosed for the separation of a mixture of HF and CF3CClFCF3. The process involves placing the mixture in a separation zone at a temperature of from about -30° C. to about 100° C. and at a pressure sufficient to maintain the mixture in the liquid phase, whereby an organic-enriched pha
A process is disclosed for the separation of a mixture of HF and CF3CClFCF3. The process involves placing the mixture in a separation zone at a temperature of from about -30° C. to about 100° C. and at a pressure sufficient to maintain the mixture in the liquid phase, whereby an organic-enriched phase comprising less than 50 mole percent HF is formed as the bottom layer and an HF-enriched phase comprising more than 90 mole percent HF is formed as the top layer. The organic-enriched phase can be withdrawn from the bottom of the separation zone and subjected to distillation in a distillation column to recover essentially pure CF3CClFCF3. The distillate comprising HF and CF3CClFCF3can be removed from the top of the distillation column while essentially pure CF3CClFCF3can be recovered from the bottom of the distillation column. The HF-enriched phase can be withdrawn from the top of the separation zone and subjected to distillation in a distillation column. The distillate comprising HF and CF3CClFCF3can be removed from the top of the distillation column while essentially pure HF can be recovered from the bottom of the distillation column. If desired, the two distillates can be recycled to the separation zone. Also disclosed are compositions of hydrogen fluoride in combination with an effective amount of CF3CClFCF3to form an azeotrope or azeotrope-like composition with hydrogen fluoride. Included are compositions containing from about 38.4 to 47.9 mole percent CF3CClFCF3. Also disclosed are processes for producing 1,1,1,2,3,3,3-heptafluoro-propane. One process uses a mixture comprising HF and CF3CClFCF3and is characterized by preparing essentially pure CF3CClFCF3as indicated above, and reacting the CF3CClFCF3with hydrogen. Another process uses an azeotropic composition as described above, and reacts the CF3CClFCF3with hydrogen in the presence of HF. Also disclosed is a process for producing hexafluoropropene. This process is characterized by preparing essentially pure CF3CClFCF3as indicated above, and dehalogenating the CF3CClFCF3.
대표청구항
▼
A process is disclosed for the separation of a mixture of HF and CF3CClFCF3. The process involves placing the mixture in a separation zone at a temperature of from about -30° C. to about 100° C. and at a pressure sufficient to maintain the mixture in the liquid phase, whereby an organic-enriched pha
A process is disclosed for the separation of a mixture of HF and CF3CClFCF3. The process involves placing the mixture in a separation zone at a temperature of from about -30° C. to about 100° C. and at a pressure sufficient to maintain the mixture in the liquid phase, whereby an organic-enriched phase comprising less than 50 mole percent HF is formed as the bottom layer and an HF-enriched phase comprising more than 90 mole percent HF is formed as the top layer. The organic-enriched phase can be withdrawn from the bottom of the separation zone and subjected to distillation in a distillation column to recover essentially pure CF3CClFCF3. The distillate comprising HF and CF3CClFCF3can be removed from the top of the distillation column while essentially pure CF3CClFCF3can be recovered from the bottom of the distillation column. The HF-enriched phase can be withdrawn from the top of the separation zone and subjected to distillation in a distillation column. The distillate comprising HF and CF3CClFCF3can be removed from the top of the distillation column while essentially pure HF can be recovered from the bottom of the distillation column. If desired, the two distillates can be recycled to the separation zone. Also disclosed are compositions of hydrogen fluoride in combination with an effective amount of CF3CClFCF3to form an azeotrope or azeotrope-like composition with hydrogen fluoride. Included are compositions containing from about 38.4 to 47.9 mole percent CF3CClFCF3. Also disclosed are processes for producing 1,1,1,2,3,3,3-heptafluoro-propane. One process uses a mixture comprising HF and CF3CClFCF3and is characterized by preparing essentially pure CF3CClFCF3as indicated above, and reacting the CF3CClFCF3with hydrogen. Another process uses an azeotropic composition as described above, and reacts the CF3CClFCF3with hydrogen in the presence of HF. Also disclosed is a process for producing hexafluoropropene. This process is characterized by preparing essentially pure CF3CClFCF3as indicated above, and dehalogenating the CF3CClFCF3.
이 특허에 인용된 특허 (5)
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Manogue William H. (Newark DE) Rao Velliyur N. M. (Wilmington DE), Halocarbon hydrogenolysis.
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Webster James L. (Parkersburg WV) McCann Elrey L. (Mendenhall PA) Bruhnke Douglas W. (Landenberg PA) Lerou Jan J. (Chadds Ford PA) Manogue William H. (Newark DE) Manzer Leo E. (Wilmington DE) Swearin, Multistep synthesis of hexafluoropropylene.
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Webster James L. (Parkersburg WV) Trofimenko Swiatoslaw (Wilmington DE) Resnick Paul R. (Wilmington DE) Bruhnke Douglas W. (Landenberg PA) Lerou Jan J. (Chadds Ford PA) Manogue William H. (Newark DE), Multistep synthesis of hexafluoropropylene.
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Berthe Bernard (Marseille FRX), Process for separating hydrogen fluoride from its mixtures with 1,1,1-trifluoro-2-chloroethane.
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Manzer Leo E. (Wilmington DE) Rao V. N. Mallikarjuna (Wilmington DE) Rockwell Richard T. (Corpus Christi TX) Sisk Michael A. (Corpus Christi TX) Warwas Edwin J. (Wilmington DE) Winteringham Roy (Hock, Process for the separation of HF via phase separation and distillation.
이 특허를 인용한 특허 (3)
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Hulse, Ryan; Pham, Hang T.; Singh, Rajiv R.; Tung, Hsueh S.; Merkel, Daniel C.; Pokrovski, Konstantin A., Azeotrope-like composition of hexafluoropropane, hexafluoropropene and hydrogen fluoride.
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Hulse, Ryan; Pham, Hang T.; Singh, Rajiv Ratna; Tung, Hsueh Sung; Merkel, Daniel C.; Pokrovski, Konstantin A., Azeotrope-like composition of hexafluoropropane, hexafluoropropene and hydrogen fluoride.
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Chiu, Yuon; Horwath, Richard Durick; Cottrell, Stephen A., Method for producing high concentration aqueous HF solutions.
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