- 4, 5-difluoroethylene carbonate and preparation method thereof
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The invention discloses 4, 5-difluoroethylene carbonate and a preparation method thereof. The purity of the 4, 5-difluoroethylene carbonate is greater than 99.9%, and the chromaticity of the 4, 5-difluoroethylene carbonate can be less than 10 Hazen. The preparation method comprises the following steps: carrying out a chlorine substitution reaction on fluoroethylene carbonate and a chlorination reagent to obtain an intermediate 4-fluoro-5-chloroethylene carbonate; and carrying out a fluorine replacement reaction on the intermediate and a fluorination reagent to obtain the 4, 5-difluoroethylenecarbonate. The 4, 5-difluoroethylene carbonate and the preparation method thereof have the beneficial effects that the raw material consumption is reduced, the yield is high, the reaction conditions are mild, the purity is of the product improved, and the performance and the cost competitiveness of the product are improved.
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Paragraph 0024-0032
(2020/04/02)
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- Preparation method for difluoroethylene carbonate
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The invention discloses a preparation method for difluoroethylene carbonate. The method comprises the following steps: step 1, adding front cut fraction of vinylene carbonate and an organic solvent into a first reaction kettle, performing mixing and dissolving completely, introducing a nitrogen gas, wherein the mass fraction of vinylene carbonate in the front cut fraction of the vinylene carbonateis 30%-60%, performing heating to the temperature of 20-50 DEG C, adding liquid bromine dropwise or introducing a chlorine gas, performing an addition reaction, after the reaction is completed, performing desolventizing, performing refining to obtain a pure product of dibromoethylene carbonate or a pure product of dichloroethylene carbonate, and putting the pure product into a second reaction kettle for standby application; step 2, adding an organic solvent into the second reaction kettle until mixing and dissolving are performed completely, then adding a fluorinating reagent, performing a reaction, adding triethylamine to make the reaction liquid system weakly acidic, heating the second reaction kettle until the temperature is 50-70 DEG C, and keeping the temperature until a reaction isfinished, so as to obtain a crude product; and step 3, performing vacuum rectification on the crude product to obtain the target product difluoroethylene carbonate. The method provided by the invention has the advantages that the target product has high purity and a high yield, can reach an electronic grade, and fully utilizes a waste liquid.
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Paragraph 0028; 0030; 0031; 0038
(2018/05/01)
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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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- METHOD FOR THE MANUFACTURE OF FLUORINATED ETHYLENE CARBONATES
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Difluoroethylene carbonate, trifluoroethylene carbonate and tetrafluoroethylene carbonate are synthesized from dichloroethylene carbonate, trichloroethylene carbonate and tetrachloroethylene carbonate with fluorinating agents, e.g. alkali metal fluorides, antimony fluorides and especially the HF adducts of amines. The fluorinated carbonates are suitable as additives in lithium ion batteries.
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Page/Page column 12
(2011/05/06)
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- CONTINUOUS PREPARATION OF CARBONATES
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A process for the manufacture of fluoroethylene carbonate, difluoroethylene carbonate, fluoromethyl methyl carbonate and difluorinated dimethyl carbonate from ethylene carbonate and dimethyl carbonate and F2 is described wherein the fluorination process is performed continuously.
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Page/Page column 10-11
(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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