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AssigneeNitto Denko Corporation
InventorsKazusa MATSUI, Masashi ECHIZEN, Atsuko MIZUIKE, Taisuke YAMAGUCHI
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The purpose of the present invention is to provide: a thin composite semipermeable membrane having a practical salt rejection and permeation flux; a method for producing said membrane; and a spiral wound separation membrane element that has a practical salt rejection and provides excellent water treatment efficiency. The method for producing the composite semipermeable membrane includes a step in while, while feeding out a porous support having a porous polymer layer on one surface of a nonwoven fabric layer from a supply roll, an amine solution containing a multifunctional amine component is brought into contact with the porous support, and an organic solution containing a multifunctional acid halide component is brought into contact with the amine solution on the porous support to cause interfacial polymerization, thus forming a skin layer containing a polyamide resin on the surface of the porous support.
A method for producing a composite semipermeable membrane, comprising a step of, while feeding out a porous support having a porous polymer layer on one surface of a nonwoven fabric layer from a supply roll, bringing an amine solution containing a multifunctional amine component into contact with the porous support, and bringing an organic solution containing a multifunctional acid halide component into contact with the amine solution on the porous support to cause interfacial polymerization so that a skin layer containing a polyamide resin is formed on a surface of the porous support, wherein
A method for producing a composite semipermeable membrane, comprising a step of, while feeding out a porous support having a porous polymer layer on one surface of a nonwoven fabric layer from a supply roll, bringing an amine solution containing a multifunctional amine component into contact with the porous support, and bringing an organic solution containing a multifunctional acid halide component into contact with the amine solution on the porous support to cause interfacial polymerization so that a skin layer containing a polyamide resin is formed on a surface of the porous support, wherein
Dependencies are inferred from the claim text.