本发明涉及精细化工技术领域,是一种制备高纯度甲缩醛的方法,特征在于该工艺以甲醇和甲醛为原料,采用反应精馏技术和变压精馏技术,制备出99.9wt%的甲缩醛,然后采用分子筛吸附的方法脱除99.9wt%甲缩醛中微量的水,经分子筛吸附后甲缩醛产品中水的含量为50mg/kg以下,含水的分子筛经过脱水后能够回收再利用。 The invention relates to the technical field of fine chemicals and is a method for preparing high purity methylal. The method comprises the following steps of: using methanol and formaldehyde as raw materials, adopting reactive distillation technology and pressure swing distillation technology to prepare 99.9wt% of methyl Acetal, and then using molecular sieve adsorption method to remove trace amounts of 99.9wt% methylal water after the molecular sieve adsorption of acetal product water content of 50mg / kg or less, the water-containing molecular sieve after dehydration can be recycled and reused .