公开(公告)号：US20170304775A1

公开(公告)日：2017-10-26

申请号：US15512960

申请日：2015-09-24

Applicant: NITTO DENKO CORPORATION

Inventor： Taisuke YAMAGUCHI ,  Atsuko MIZUIKE ,  Masashi ECHIZEN ,  Kazusa MATSUI

IPC: B01D63/10 ,  B01D69/10

CPC classification number: B01D63/10 ,  B01D63/103 ,  B01D69/10 ,  B01D2313/146 ,  B01D2325/04

Abstract: The present invention provides a spiral membrane element in which the effective membrane area of a composite semi-permeable membrane can be increased and any decrease in rejection rate is less likely to occur. The spiral membrane element includes: a laminate including a permeation-side flow path material, a supply-side flow path material, and a composite semi-permeable membrane having a separation function layer on a surface of a porous support; a perforated central tube around which the laminate is wound; and a sealing member for preventing mixing between the supply-side flow path and a permeation-side flow path, the spiral membrane element being characterized in that the thickness of the porous support of the composite semi-permeable membrane is 80 μm to 100 μm, the permeation-side flow path material is formed from a tricot knit fabric, and the width of a groove that continues in a straight line is 0.05 mm to 0.40 mm.

公开(公告)号：US20170282129A1

公开(公告)日：2017-10-05

申请号：US15514282

申请日：2015-09-28

Applicant: NITTO DENKO CORPORATION

Inventor： Kazusa MATSUI ,  Masashi ECHIZEN ,  Atsuko MIZUIKE ,  Taisuke YAMAGUCHI

IPC: B01D69/12 ,  B01D65/00 ,  B01D71/56 ,  B01D63/10 ,  B01D71/48

CPC classification number: B01D69/125 ,  B01D63/10 ,  B01D65/003 ,  B01D69/02 ,  B01D69/10 ,  B01D69/12 ,  B01D71/48 ,  B01D71/56 ,  B01D2313/04 ,  B01D2325/04 ,  C02F1/44 ,  C08G69/28 ,  C08G69/30 ,  C08G73/0633

Abstract: 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.

公开(公告)号：US20180001274A1

公开(公告)日：2018-01-04

申请号：US15545111

申请日：2016-01-20

Applicant: NITTO DENKO CORPORATION

Inventor： Kazusa MATSUI ,  Nobuaki MARUOKA

IPC: B01D69/12 ,  B01D69/10 ,  B01D63/10 ,  C08G69/26 ,  B01D71/56

CPC classification number: B01D69/125 ,  B01D63/10 ,  B01D69/02 ,  B01D69/10 ,  B01D71/56 ,  B01D2323/40 ,  C08G69/26 ,  C08G73/0633

Abstract: The purpose of the present invention is to provide a composite semipermeable membrane whose water permeability is hard to decline even when exposed to high temperature environment for a long period of time, a spiral wound separation membrane element using the composite semipermeable membrane, and a method for producing the same. Another purpose of the invention is to provide a method for evaluating water permeation performance of a composite semipermeable membrane, which method evaluates whether the water permeability of a composite semipermeable membrane is likely to decline due to heat, by a simple evaluation method. The composite semipermeable membrane having a skin layer that includes a polyamide resin, the skin layer being placed on a porous support and having an elastic modulus of 100 MPa or more, calculated by AFM force curve measurement in water.

公开(公告)号：US20170274328A1

公开(公告)日：2017-09-28

申请号：US15508620

申请日：2015-08-28

Applicant: NITTO DENKO CORPORATION

Inventor： Atsuko MIZUIKE ,  Masashi ECHIZEN ,  Kazusa MATSUI ,  Taisuke YAMAGUCHI

IPC: B01D69/12 ,  B32B27/12 ,  B32B27/06

CPC classification number: B01D69/125 ,  B01D69/02 ,  B01D69/10 ,  B01D71/56 ,  B01D2325/04 ,  B01D2325/44 ,  B32B27/06 ,  B32B27/12

Abstract: Provided are a composite semipermeable membrane that will maintain a sufficient level of rejection performance even when produced using different thicknesses of a porous support or different production conditions, a separation membrane element having such a composite semipermeable membrane, and a method for producing such a composite semipermeable membrane. The composite semipermeable membrane includes a porous support including a nonwoven fabric layer and a polymer porous layer on one surface of the nonwoven fabric layer; and a separation function layer on the surface of the porous support, wherein the porous support has a defect frequency F1 of 50 or less per 480 m2 with respect to defects having a width of 0.3 mm or more perpendicular to the direction of the polymer porous layer production line, when the relationship between the size and frequency of defects in the porous support is measured with transmitted light.