Turn on the stirring and reflux system of the reaction kettle (No.:ETF062), and confirm that the system is vented, heat to 40±5oC, stir and reflux for 2 hours. After the reaction kettle (No.:ETF062) is cooled to 30±5oC, the methylene chloride in the reaction kettle (No.:ETF086) is pressed into the reaction kettle (No.:ETF085) through the bottom valve, process pipeline and microporous filter (No.:EGL027).
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