Process method for preparing chloromethylphosphonic acid

The invention discloses a process method for preparing chloromethylphosphonic acid, wherein the process method comprises the following steps: S1, sequentially adding a solvent and hydrochloric acid into a reaction container, and uniformly stirring; S2, adding hydroxymethyl phosphonic acid diester, and uniformly stirring to obtain a reaction solution; and S3, cooling the reaction liquid, reducing pressure, evaporating the reaction liquid to dryness, adding hydrochloric acid into the obtained residue, standing, and freeze-drying to obtain the chloromethylphosphonic acid. The method has the advantages of safe and easily available raw materials, high process safety, less waste material and high product purity. 本发明公开了一种制备氯甲基膦酸的工艺方法，包括以下步骤：S1：向反应容器中依次加入溶剂和盐酸，搅匀；S2：向其中加入羟甲基膦酸二酯，搅匀，得到反应液；S3：将所述反应液冷却，减压将所述反应液蒸干，所得残余物中加入盐酸，静置后冻干，得到氯甲基膦酸。其原料安全易得，工艺安全性高，废料少，产品纯度高。