# US 2017/0282129 A1 · Composite semipermeable membrane and method for producing the same, spiral wound separation membrane element

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- Number: US 2017/0282129 A1
- Document ID: US20170282129A1
- Status: Published application
- Kind: A1
- Application number: 15/514,282
- Filed: 2015-09-28
- Published: 2017-10-05
- Earliest claimed: 2014-09-30
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Kazusa MATSUI; Masashi ECHIZEN; Atsuko MIZUIKE; Taisuke YAMAGUCHI
- Web page: https://patentgrep.com/patent/US20170282129A1

## CPC

- B01D 69/1251: {by interfacial polymerisation}
- B01D 63/10: Spiral-wound membrane modules
- B01D 65/003: {Membrane bonding or sealing}
- B01D 69/1071: {Woven, non-woven or net mesh}
- B01D 69/12: Composite membranes; Ultra-thin membranes
- B01D 71/48: Polyesters
- B01D 71/56: Polyamides, e.g. polyester-amides
- C02F 1/44: by dialysis, osmosis or reverse osmosis {(general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268)}
- C08G 69/28: Preparatory processes
- C08G 69/30: Solid state polycondensation
- C08G 73/0633: {with only two nitrogen atoms in the ring}
- B01D 69/02: characterised by their properties
- B01D 2313/042: Adhesives or glues
- B01D 2325/04: Characteristic thickness
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## 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.

## Claims

### Claim 1

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
the nonwoven fabric layer is 50 to 90 μm thick, and
the amine solution is brought into contact with the porous support when the rate of decrease of the moisture content of the porous support is within 15% relative to 100% that is the moisture content of the porous support when being fed out from the supply roll.

### Claim 2

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
the nonwoven fabric layer is 50 to 90 μm thick, and
the rate of decrease of the moisture content of the porous support when the amine solution is brought into contact with the porous support is maintained within 15% relative to 100% that is the moisture content of the porous support when being fed out from the supply roll.

### Claim 3 (depends on 1)

The method for producing a composite semipermeable membrane according to claim 1, wherein the porous polymer layer is 10 to 35 μm thick.

### Claim 4 (depends on 1)

A composite semipermeable membrane obtained by the production method according to claim 1.

### Claim 5 (depends on 4)

A spiral wound separation membrane element comprising the composite semipermeable membrane according to claim 4.

### Claim 6 (depends on 2)

The method for producing a composite semipermeable membrane according to claim 2, wherein the porous polymer layer is 10 to 35 μm thick.

### Claim 7 (depends on 2)

A composite semipermeable membrane obtained by the production method according to claim 2.

### Claim 8 (depends on 3)

A composite semipermeable membrane obtained by the production method according to claim 3.

### Claim 9 (depends on 6)

A composite semipermeable membrane obtained by the production method according to claim 6.

### Claim 10 (depends on 7)

A spiral wound separation membrane element comprising the composite semipermeable membrane according to claim 7.

### Claim 11 (depends on 8)

A spiral wound separation membrane element comprising the composite semipermeable membrane according to claim 8.

### Claim 12 (depends on 9)

A spiral wound separation membrane element comprising the composite semipermeable membrane according to claim 9.