Process for synthesizing cyclic carbonate
A carbon dioxide and epoxy compound technology, applied in the direction of organic chemistry, can solve the problems of low catalytic activity, difficult recovery of catalysts for product separation, etc., and achieve the effects of high product purity, low vapor pressure, and simple catalyst system
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Embodiment 1
[0019] Add 5 moles of propylene oxide and 60 millimoles of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid catalyst and 15 millimoles of tetrabutylammonium bromide cocatalyst into a 5-liter stainless steel high-pressure reactor After replacing the air in the kettle with carbon dioxide gas, carbon dioxide gas was introduced under stirring, and the reaction kettle was weighed so that the molar ratio of carbon dioxide and propylene oxide added was 1.3:1. The reaction kettle was sealed, and the temperature was slowly raised to 110° C. under stirring for 6 hours. After cooling to room temperature, excessive carbon dioxide gas was released, and the liquid obtained from the reaction was analyzed by GC / MS, and then the product propylene carbonate was collected by vacuum distillation with a yield of 91.2%.
Embodiment 2
[0021] Add 5 moles of ethylene oxide, 60 millimoles of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid catalyst and 15 millimoles of tetrabutylammonium bromide cocatalyst into a 5 liter stainless steel reactor After replacing the air in the kettle with carbon dioxide gas, carbon dioxide gas was introduced under stirring, and the reaction kettle was weighed so that the molar ratio of carbon dioxide and ethylene oxide added was 1.3:1. The reaction kettle was sealed, and the temperature was slowly raised to 110° C. under stirring for 6 hours. Cool to room temperature, release excess carbon dioxide gas, carry out GC / MS analysis to the liquid obtained by reaction, carry out normal pressure distillation, recover the unreacted ethylene oxide, then collect the product ethylene carbonate by vacuum distillation, the yield is 85.6% .
Embodiment 3
[0023] Add 5 moles of epichlorohydrin, other operations and reaction conditions are the same as Example 1, and the yield of chloropropylene carbonate is 91.0%.
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