Open the reflux system of the reaction kettle (No.:ETF075), keep the internal temperature of the reaction kettle (No.:ETF075) at 40±5oC, and reflux for 2h. At the end of reflux, after the reaction kettle (No.:ETF075) is cooled to 30±5oC, put dichloromethane in the reaction kettle (No.:ETF075) into the reaction kettle (No.:ETF057) through the bottom valve, the process pipeline and the microporous filter (No.:EGL026).
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