Method for producing ring carbonic acid ester with hydroxyl ion liquid
A cyclic carbonate and ionic liquid technology, applied in clean catalysis and green fields, can solve problems such as poor stability, low catalytic activity, harsh reaction conditions, etc.
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Embodiment 1
[0024]
[0025] Implementation method: In a 100ml stainless steel autoclave, add 3.2mmol of 1-ethanolyl-3-methylimidazolium bromide and 14ml of propylene oxide (1a) successively, seal the reaction vessel, and fill it with carbon dioxide with an appropriate amount of pressure, controlled by a temperature controller Slowly raise the temperature to 125°C, then control the pressure of carbon dioxide to 2.0MPa, react for 1.0 hour, cool to room temperature, unload the kettle, absorb excess carbon dioxide with saturated sodium carbonate solution, and distill the obtained liquid under reduced pressure to obtain product (2a), gas chromatography Analysis showed that the selectivity of product (2a) was >99.8%, and the yield was 99%.
Embodiment 2
[0027] With embodiment 1, catalyst used is choline chloride 7mmol, and its structural formula is Other conditions remain unchanged, the selectivity of (2a) is 98.5%, and the yield is 80%.
Embodiment 3
[0029] With embodiment 2, catalyst used is choline bromide 3.2mmol, and its structural formula is Other conditions remain unchanged, the selectivity of (2a) is 99%, and the yield is 97%.
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