Method of preparing fluorine-containing olefin
A technology for fluorine-containing olefins and fluorochloroalkanes, applied in the field of organic fluorine chemistry, can solve problems such as hidden safety hazards, easy agglomeration, poor dispersion of metal dechlorination agents, etc., and achieves both reaction yield and efficiency, low toxicity, and solubility. Capable effect
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Embodiment 1
[0025] In a jacketed, anchored stirrer equipped with 1m 3 In the stirred tank, add 200kg of zinc powder with a specification of 200 mesh (average particle size of about 80 microns), 100kg of N,N-dimethylformamide (DMF), 350kg of deionized water, and the jacket is passed into circulating hot water to wait for the kettle When the internal temperature rises to 50°C, the flow meter starts to feed difluorotetrachloroethane in a controlled manner at a feeding rate of about 200 kg / h. As soon as difluorotetrachloroethane is added to the reaction kettle, dechlorination reaction will occur, and the heat will be released strongly. At this time, the temperature of the circulating water must be lowered so that the temperature of the kettle will not rise too much. The cumulative amount of difluorotetrachloroethane added is 600kg. The generated difluorodichloroethylene is a mixture of several isomers (b.p18.9~22°C) passing through the rectification column set on the kettle to control the ref...
Embodiment 2
[0027] Replace 200 mesh zinc powder in embodiment 1 with zinc powder of 100 mesh (average particle diameter about 150 microns), all the other are the same as embodiment 1. 345kg of the product was collected, the total content of the two isomers of difluorodichloroethylene in the product was 96.17%, and the yield of the dechlorination reaction was 91.1%.
Embodiment 3
[0029] DMF and deionized water in Example 1 were replaced by 100kg N,N-dimethylacetamide (DMAC) and 350kg deionized water, and the rest were the same as in Example 1. The raw material difluorotetrachloroethane was 587kg, and the collected product was 355kg. The total content of the two isomers of difluorodichloroethylene in the product was 98.54%, and the yield of the dechlorination reaction was 98.2%.
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