用甲醇和回收的稀甲醛液合成高纯度的甲缩醛,收率达100.0%.再用质量分数70.0%的甲醛液精制合成100.0%甲醛,收率达98.0%,用于生产三聚甲醛,选择性为99.6%.用缩醛法生产聚甲醛,单程收率高、产品质量好、工艺简单、单耗低,可显著地降低生产成本.介绍了甲缩醛法生产聚甲醛的新工艺及产品的性质、市场应用;指明了聚甲醛的开发前景. High purity methylal was synthesized with methanol and recovered dilute formaldehyde solution in a yield of 100.0% .After 100.0% formaldehyde was purified from 70.0% formaldehyde solution, the yield was 98.0%, which was used to produce trioxane, The selectivity is 99.6% .Polyformal acetal production method, one-way high yield, good product quality, simple process, low consumption, can significantly reduce production costs. Introduced methylal production of polyoxymethylene new technology and The nature of products, market applications; POM development prospects.