# US 2026/0084098 A1 · Separation Membrane Unit And Separation Apparatus

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- Number: US 2026/0084098 A1
- Document ID: US20260084098A1
- Status: Published application
- Kind: A1
- Application number: 19/333,689
- Filed: 2025-09-19
- Published: 2026-03-26
- Earliest claimed: 2024-09-20
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Satoru FUKUI
- Web page: https://patentgrep.com/patent/US20260084098A1

## CPC

- B01D 53/228: {characterised by specific membranes}
- B01D 67/0062: {by micromachining techniques, e.g. using masking and etching steps, photolithography}
- B01D 69/02: characterised by their properties
- B01D 69/108: {Inorganic support material}
- B01D 71/70: Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only
- B01D 71/701: {Polydimethylsiloxane}
- B01D 2053/222: {with plates}
- B01D 2256/10: Nitrogen
- B01D 2257/504: Carbon dioxide
- B01D 2325/022: Asymmetric membranes
- B01D 2325/0283: Pore size
- B01D 2325/02832: 1-10 nm
- B01D 2325/02833: more than 10 and up to 100 nm
- B01D 2325/02834: more than 0.1 and up to 1 µm
- B01D 2325/04: Characteristic thickness
- B01D 2325/20: Specific permeability or cut-off range
- Y02C 20/40: of CO2
- 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)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

Provided is a separation membrane unit that selectively separates carbon dioxide gas from a supply gas containing the carbon dioxide gas and nitrogen gas, the separation membrane unit including: a porous plate in which a plurality of through holes are formed; and a separation membrane including a porous body disposed on the first surface of the porous plate and a resin layer disposed on the porous body and selectively permeating the carbon dioxide gas contained in the supply gas toward the porous body, wherein when the average thickness of the separation membrane is defined as T1, and the average diameter of the plurality of through holes on the first surface is defined as D1, T1/D1≥0.02 is satisfied, and when the carbon dioxide gas permeability of the separation membrane is defined as A, and the nitrogen gas permeability of the separation membrane is B and the gas permeability of the porous plate is C, 1>(B+C)/(A+C)≥0.8 is satisfied.

## Claims

### Claim 1

A separation membrane unit that selectively separates carbon dioxide gas from a supply gas containing the carbon dioxide gas and nitrogen gas, the separation membrane unit comprising:
a porous plate having a first surface and a second surface opposite to each other, and in which a plurality of through holes extending from the first surface toward the second surface are formed;
and a separation membrane including a porous body disposed on the first surface and a resin layer disposed on the porous body and selectively permeating the carbon dioxide gas contained in the supply gas toward the porous body,
wherein when the carbon dioxide gas permeability of the separation membrane is defined as A, 500,000 GPU≥A≥1,000 GPU is satisfied,
when the average thickness of the separation membrane is defined as T1, 200 μm≥T1≥10 μm is satisfied;
when the average diameter of the plurality of through holes on the first surface is D1, T1/D1≥0.02 is satisfied, and
when the nitrogen gas permeability of the separation membrane is defined as B and the gas permeability of the porous plate is defined as C, 1>(B+C)/(A+C)≥0.8 is satisfied.

### Claim 2 (depends on 1)

The separation membrane unit according to claim 1, wherein 1.5≥T1/D1 is satisfied.

### Claim 3 (depends on 1)

The separation membrane unit according to claim 1, wherein 5 mm≥D1≥0.1 mm is satisfied.

### Claim 4 (depends on 1)

The separation membrane unit according to claim 1, wherein when the average thickness of the porous plate is defined as T2, 30 mm≥T2≥0.05 mm is satisfied.

### Claim 5 (depends on 1)

The separation membrane unit according to claim 1, wherein an opening ratio of the porous plate is 5% or more and 95% or less.

### Claim 6 (depends on 1)

The separation membrane unit according to claim 1, wherein a diameter of the through hole decreases continuously or stepwise in a direction from the first surface toward the second surface.

### Claim 7 (depends on 1)

The separation membrane unit according to claim 1,
wherein a plurality of pores are formed in the porous body, and an average diameter of the plurality of pores is 5 nm or more and 1,000 nm or less.

### Claim 8 (depends on 1)

The separation membrane unit according to claim 1, wherein the porous plate contains a metal material or a ceramic material.

### Claim 9 (depends on 1)

The separation membrane unit according to claim 1, wherein the resin layer contains an organopolysiloxane.

### Claim 10 (depends on 1)

The separation membrane unit according to claim 1, wherein the porous body contains a polymer material, a ceramic material, or a metal material.

### Claim 11 (depends on 1)

A separation apparatus mounted with the separation membrane unit according to claim 1.