酯酯交换合成碳酸甲乙酯和碳酸二乙酯的新工艺OA

Methyl ethyl carbonate and diethyl carbonate were synthesized by ester-ester exchange using dimethyl carbonate and ethyl acetate as raw materials,methanol solution of sodium methoxide as catalyst,at room temperature and pressure.The conversion rate of raw material dimethyl carbonate can reach about 65％.After filtering out the catalyst,the clear liquid can be separated by distillation to obtain battery grade products.Unreacted raw materials are recycled,and the by-product methyl acetate is also a common organic solvent.The utilization rate of raw materials is 100％.Compared with the existing ester-alcohol exchange method using dimethyl carbonate and ethanol as raw materials,it shortens the reaction time of ester exchange significantly,prevents the precipitation and scaling on the equipment wall by the catalyst conversion products,and solves the problem of difficult product separation and purification caused by product azeotrope in the ester-alcohol exchange process.It is expected that this new process can replace the old process of the current ester-alcohol exchange.