| 摘要 |
The present invention aims at providing a process for producing composite semipermeable membrane excellent in water permeability and salt-blocking rate, and including an extremely small amount of unreacted components in the membrane, and at providing a composite semipermeable membrane obtained by the production process. The present invention relates to a process for producing a composite semipermeable membrane, comprising the steps of: producing an unwashed composite semipermeable membrane by forming a skin layer including a polyamide resin obtained by reaction between a polyfunctional amine component and a polyfunctional acid halide component on the surface of a porous support; and pretreating the unwashed composite semipermeable membrane by contact to a solution containing a water-soluble alcohol, and subsequently performing a membrane washing treatment by contact to pure water or ion exchange water.
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