By having a coating layer, this composite semipermeable membrane has fouling resistance easily maintainable before and after contact with acid, and enables stable operation over a long period of time. This composite semipermeable membrane comprises a porous support layer, a separation function layer arranged on the porous support layer, and a coating layer arranged on the separation function layer, wherein the separation function layer contains a crosslinked aromatic polyamide which is a polycondensate of polyfunctional aromatic amines and polyfunctional aromatic acid chloride, and the coating layer contains an aliphatic polymer having the structure (I) in the description.
通过涂层,这种复合半透膜在与酸接触前后都能轻松保持抗污性,并能长期稳定运行。这种复合半透膜由多孔支撑层、设置在多孔支撑层上的分离功能层和设置在分离功能层上的涂层组成,其中分离功能层包含交联芳香族聚酰胺,它是多官能芳香胺和多官能芳香族
氯化酸的缩聚物,涂层包含具有描述中结构(I)的脂肪族聚合物。