波多野结衣高潮喷水首页_色天堂亚洲视频在线观看_国产三级片在线超爽观看_a级国产乱理 片在线观看

Industrial paraformaldehyde with dilute formaldehyde solution as raw material, through decompression evaporation, condensation in the presence of catalyst, and then through filtration, washing and vacuum drying, the finished product.Among them, vacuum drying process is more critical. There are two kinds of rake vacuum drying and spray drying. Spray drying products with uniform particles and good solubility play a dominant role.The chemical reaction equation is nCH2O- (CH2O)n. Each t of solid formaldehyde consumes 37% of the formaldehyde solution 3.18t.Main production equipment: concentration kettle, condenser, evaporator, filter, dryer, fan, pump and so on.

Industrial polyformaldehyde has high effective composition and is a solid particle, which is conducive to chemical synthesis and other industrial applications, especially in the synthesis requiring the use of anhydrous formaldehyde as raw materials.It can also be used as disinfectants, fungicides, fumigants and herbicides, as well as in the manufacture of resins and artificial ivory.