以N,N-二甲基甲酰胺为溶剂萃取精馏制备高纯度甲缩醛
이N,N-이갑기갑선알위용제췌취정류제비고순도갑축철
Preparation of high purity methylal by extractive distillation using N,N-dimethylformamide (DMF) as solvent
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