Composite reverse osmosis membrane having active layer of aromatic polyester or copolymer of aromatic polyester and aromatic polyamide

摘要

A composite reverse osmosis membrane may advantageously be prepared by the process comprising applying porous support layer onto a nonwoven fabric and then forming an ultrathin active layer of an aromatic polyester superposed thereon, the active layer being prepared by the interfacial polymerization of an aqueous solution of polyhydric phenol and a solution of aromatic acyl halide dissolved in an organic solvent; or applying a porous support layer onto a nonwoven fabric and then forming an ultrathin active layer of a copolymer of aromatic polyester and aromatic polyamide superposed thereon, the active layer being prepared by the interfacial polymerization of a mixed aqueous solution of polyhydric phenol and an aromatic amine with a solution of aromatic acyl halide dissolved in an organic solvent. The composite membrane of the present invention has improvements in properties, such as water- permeability, chlorine-resistance, oxidation stability, salt rejection rate, and durability.