- Preparation method of 4,4-difluoroethylene carbonate
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The invention relates to a preparation method of 4,4-difluoroethylene carbonate. The preparation method of 4,4-difluoroethylene carbonate mainly comprises the following steps: (1) performing epoxidation reaction on 1,1-difluoroethylene to obtain 1,1-difluoroethylene oxide; (2) conducting reaction on 1,1-difluoroethylene oxide and carbon dioxide to obtain 4,4-difluoroethylene carbonate. Compared with the prior art, the preparation method has the advantages that the obtained product has higher selectivity and yield, the raw material 1,1-difluoroethylene is cheap and easily available, the economic benefit is significant, and the preparation method is suitable for industrialized production.
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Paragraph 0012; 0013; 0014
(2017/08/29)
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- MANUFACTURE OF DIFLUOROETHYLENE CARBONATE, TRIFLUOROETHYLENE CARBONATE AND TETRAFLUOROETHYLENE CARBONATE
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Difluoroethylene carbonate, trifluoroethylene and tetrafluoroethylene carbonate are produced by the reaction between elemental fluorine and ethylene carbonate or fluorinated ethylene carbonates with a lower degree of fluorination.
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Page/Page column 11-13
(2011/04/24)
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- Manufacturing method and apparatus of 4-fluoroethylene carbonate control system of autonomous intelligent distributed control modules
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Disclosed herein is a method of producing 4-fluoroethylene carbonate, in which ethylene carbonate reacts with a mixture of fluorine and nitrogen gases. The method comprises feeding a mixture gas of fluorine gas and nitrogen gas into a reactor having ethylene carbonate charged therein, so as to react the ethylene carbonate with the mixture gas of the fluorine gas and the nitrogen gas. The mixture gas fed in the reactor is regulated to have a desired bubble size while passing through a gas bubble regulating column, in which a packing for a packed column is packed. In the method, EC directly reacts with F2/N2 mixture gas to produce FEC, thus a purification process is simple and it is possible to produce FEC at high conversion efficiency and selectivity.
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Page/Page column 3-5
(2008/06/13)
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- Development of direct fluorination technology for application to materials for lithium battery
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Direct fluorination of 1,3-dioxolan-2-one with elemental fluorine was successfully carried out to provide 4-fluoro-1,3-dioxolan-2-one, which was expected as an additive for lithium ion secondary battery. 4-Fluoro-1,3-dioxolan-2-one was also further fluorinated with elemental fluorine to give three isomers of difluoro derivatives by the same methodology. Another topic is the preparation of trifluoromethanesulfonyl fluoride, an intermediate of lithium battery electrolyte, by the reaction of methanesulfonyl fluoride with elemental fluorine. The use of perfluoro-2-methylpentane as a solvent gave satisfactory selectivity of trifluoromethanesulfonyl fluoride.
- Kobayashi, Masafumi,Inoguchi, Tetsuya,Iida, Takashi,Tanioka, Takashi,Kumase, Hiroshi,Fukai, Yasushi
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p. 105 - 110
(2007/10/03)
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- Electrolytic partial fluorination of organic compound. Part: 53 Highly regioselective anodic mono- and difluorination of 4-arylthio-1,3-dioxolan-2-ones. A marked solvent effect on fluorinated product selectivity
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Anodic fluorination of 4-arylthio-1,3-dioxolan-2-ones was investigated using various supporting fluoride salts and solvents. Their fluoro-desulfurization took place predominantly in Et4NF·5HF/CH2Cl2 while the use of Et4NF·4HF/DME resulted in α-fluorination, without the desulfurization, selectively. Electrolytic solvents affected markedly the product selectivity as compared with supporting fluoride salts. This is the first example of a solvent effect on the fluorinated product selectivity in the anodic fluorination.
- Ishii, Hideki,Yamada, Norihisa,Fuchigami, Toshio
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p. 9067 - 9072
(2007/10/03)
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- Highly selective anodic monofluorination of 4-arylthio-1,3-dioxolan-2-ones: A marked solvent effect on product selectivity
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This is the first example of a solvent effect on fluorinated product selectivity; anodic fluorination of 4-arylthio-1,3-dioxolan-2-ones in CH2Cl2 containing a fluoride supporting electrolyte using an undivided cell provided the fluoro-desulfurization product, 4-fluoro-1,3-dioxolan-2-one preferentially while anodic fluorination in DME resulted in α-fluorination, without desulfurization, selectively.
- Ishii,Yamada,Fuchigami
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p. 1617 - 1618
(2007/10/03)
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