# US 2019/0314768 A1 · Separation membrane and laminate

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- Number: US 2019/0314768 A1
- Document ID: US20190314768A1
- Status: Published application
- Kind: A1
- Application number: 16/462,109
- Filed: 2017-11-16
- Published: 2019-10-17
- Earliest claimed: 2016-11-17
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Naomichi KIMURA; Terukazu IHARA; Katsumi ISHII; Akira SHIMAZU; Yuri ITO
- Web page: https://patentgrep.com/patent/US20190314768A1

## CPC

- B01D 69/02: characterised by their properties
- B01D 61/362: {Pervaporation}
- B01D 67/0088: {Physical treatment with compounds, e.g. swelling, coating or impregnation}
- B01D 69/107: {Organic support material}
- B01D 69/1213: {Laminated layers}
- B01D 71/5211: {Polyethylene glycol or polyethyleneoxide}
- B01D 71/56: Polyamides, e.g. polyester-amides
- B01D 71/80: Block polymers
- 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)

## Abstract

An aspect of the present invention relates to a separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B), wherein the separation membrane has a first surface and a second surface opposite to the first surface, an affinity of the first surface side of the separation membrane for the component (A) is higher than an affinity of the first surface side of the separation membrane for the component (B), and an affinity of the second surface side of the separation membrane for the component (A) is higher than the affinity of the first surface side of the separation membrane for the component (A).

## Claims

### Claim 1

A separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B),
the separation membrane comprising a first surface and a second surface opposite to the first surface,
wherein an affinity of the first surface side of the separation membrane for the component (A) is higher than an affinity of the first surface side of the separation membrane for the component (B), and
wherein an affinity of the second surface side of the separation membrane for the component (A) is higher than the affinity of the first surface side of the separation membrane for the component (A).

### Claim 2 (depends on 1)

The separation membrane as claimed in claim 1, wherein the affinity of the second surface side of the separation membrane for the component (A) is higher than an affinity of the second surface side of the separation membrane for the component (B).

### Claim 3

A separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B),
the separation membrane comprising a first surface and a second surface opposite to the first surface,
wherein the separation membrane satisfies relationships represented by formula (1) and formula (2) described below:
|SP1−SPA|<|SP1−SPB| (1)
|SP2−SPA|<|SP1−SPA| (2)
wherein SPA represents an SP value of the component (A), SPB represents an SP value of the component (B), SP1 represents an SP value of the first surface side of the separation membrane, and SP2 represents an SP value of the second surface side of the separation membrane.

### Claim 4 (depends on 3)

The separation membrane as claimed in claim 3, which further satisfies a relationship represented by formula (3) described below.
|SP2−SPA|<|SP2−SPB| (3)

### Claim 5

A separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B),
the separation membrane comprising a first surface and a second surface opposite to the first surface,
wherein an interaction energy between the component (A) and the first surface side of the separation membrane is higher than an interaction energy between the component (B) and the first surface side of the separation membrane, and
wherein an interaction energy between the component (A) and the second surface side of the separation membrane is lower than the interaction energy between the component (A) and the first surface side of the separation membrane.

### Claim 6 (depends on 5)

The separation membrane as claimed in claim 5, wherein the interaction energy between the component (A) and the second surface side of the separation membrane is higher than an interaction energy between the component (B) and the second surface side of the separation membrane.

### Claim 7 (depends on 1)

The separation membrane as claimed in claim 1, wherein a free volume fraction of the first surface side of the separation membrane is smaller than a free volume fraction of the second surface side of the separation membrane.

### Claim 8 (depends on 1)

The separation membrane as claimed in claim 1, wherein a swelling amount of the first surface side of the separation membrane with the fluid is smaller than a swelling amount of the second surface side of the separation membrane with the fluid.

### Claim 9 (depends on 1)

The separation membrane as claimed in claim 1, wherein a vapor permeance ratio in terms of the component (A) to the component (B) of the first surface side of the separation membrane is larger than a vapor permeance ratio in terms of the component (A) to the component (B) of the second surface side of the separation membrane.

### Claim 10 (depends on 1)

The separation membrane as claimed in claim 1, wherein a concentration of the component (A) occupied in a swelling component when the first surface side of the separation membrane is swollen with the fluid is larger than a concentration of the component (A) occupied in a swelling component when the second surface side of the separation membrane is swollen with the fluid.

### Claim 11

A separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B),
the separation membrane comprising a first surface and a second surface opposite to the first surface,
wherein a swelling amount of the first surface side of the separation membrane with the fluid is smaller than a swelling amount of the second surface side of the separation membrane with the fluid, and
wherein a vapor permeance ratio in terms of the component (A) to the component (B) of the first surface side of the separation membrane is larger than a vapor permeance ratio in terms of the component (A) to the component (B) of the second surface side of the separation membrane.

### Claim 12 (depends on 11)

The separation membrane as claimed in claim 11, wherein a concentration of the component (A) occupied in a swelling component when the first surface side of the separation membrane is swollen with the fluid is larger than a concentration of the component (A) occupied in a swelling component when the second surface side of the separation membrane is swollen with the fluid.

### Claim 13 (depends on 1)

The separation membrane as claimed in claim 1, which comprises a multilayer structure comprising at least a first layer providing the first surface and a second layer providing the second surface.

### Claim 14 (depends on 1)

A laminate, comprising a porous support, and the separation membrane as claimed in claim 1 provided on the porous support.

### Claim 15 (depends on 3)

The separation membrane as claimed in claim 3, wherein a free volume fraction of the first surface side of the separation membrane is smaller than a free volume fraction of the second surface side of the separation membrane.

### Claim 16 (depends on 3)

The separation membrane as claimed in claim 3, wherein a swelling amount of the first surface side of the separation membrane with the fluid is smaller than a swelling amount of the second surface side of the separation membrane with the fluid.

### Claim 17 (depends on 3)

The separation membrane as claimed in claim 3, wherein a vapor permeance ratio in terms of the component (A) to the component (B) of the first surface side of the separation membrane is larger than a vapor permeance ratio in terms of the component (A) to the component (B) of the second surface side of the separation membrane.

### Claim 18 (depends on 3)

The separation membrane as claimed in claim 3, wherein a concentration of the component (A) occupied in a swelling component when the first surface side of the separation membrane is swollen with the fluid is larger than a concentration of the component (A) occupied in a swelling component when the second surface side of the separation membrane is swollen with the fluid.

### Claim 19 (depends on 3)

The separation membrane as claimed in claim 3, which comprises a multilayer structure comprising at least a first layer providing the first surface and a second layer providing the second surface.

### Claim 20 (depends on 3)

A laminate, comprising a porous support, and the separation membrane as claimed in claim 3 provided on the porous support.

### Claim 21 (depends on 5)

The separation membrane as claimed in claim 5, wherein a free volume fraction of the first surface side of the separation membrane is smaller than a free volume fraction of the second surface side of the separation membrane.

### Claim 22 (depends on 5)

The separation membrane as claimed in claim 5, wherein a swelling amount of the first surface side of the separation membrane with the fluid is smaller than a swelling amount of the second surface side of the separation membrane with the fluid.

### Claim 23 (depends on 5)

The separation membrane as claimed in claim 5, wherein a vapor permeance ratio in terms of the component (A) to the component (B) of the first surface side of the separation membrane is larger than a vapor permeance ratio in terms of the component (A) to the component (B) of the second surface side of the separation membrane.

### Claim 24 (depends on 5)

The separation membrane as claimed in claim 5, wherein a concentration of the component (A) occupied in a swelling component when the first surface side of the separation membrane is swollen with the fluid is larger than a concentration of the component (A) occupied in a swelling component when the second surface side of the separation membrane is swollen with the fluid.

### Claim 25 (depends on 5)

The separation membrane as claimed in claim 5, which comprises a multilayer structure comprising at least a first layer providing the first surface and a second layer providing the second surface.

### Claim 26 (depends on 5)

A laminate, comprising a porous support, and the separation membrane as claimed in claim 5 provided on the porous support.

### Claim 27 (depends on 11)

The separation membrane as claimed in claim 11, which comprises a multilayer structure comprising at least a first layer providing the first surface and a second layer providing the second surface.

### Claim 28 (depends on 11)

A laminate, comprising a porous support, and the separation membrane as claimed in claim 11 provided on the porous support.