# US 2023/0264152 A1 · Gas separation membrane, gas separation membrane module, and production method for gas separation membrane > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0264152 A1 - Document ID: US20230264152A1 - Status: Published application - Kind: A1 - Application number: 18/004,074 - Filed: 2021-07-13 - Published: 2023-08-24 - Earliest claimed: 2020-08-03 - Assignees: Toray Industries, Inc. - Applicants: Toray Industries, Inc. - Inventors: So Kakiyama; Takaaki Mihara - Web page: https://patentgrep.com/patent/US20230264152A1 ## CPC - B01D 71/0213: {Silicon} - B01D 53/22: by diffusion (manufacturing semi-permeable membranes B01D67/00; form, structure or properties of semi-permeable membranes B01D69/00; material for semi-permeable membranes B01D71/00) - B01D 53/228: {characterised by specific membranes} - B01D 67/0079: {Manufacture of membranes comprising organic and inorganic components} - B01D 69/02: characterised by their properties - B01D 69/08: Hollow fibre membranes (manufacture of hollow fibres D01D5/24, D01F1/08) - B01D 69/1213: {Laminated layers} - B01D 69/148: {Organic/inorganic mixed matrix membranes} - B01D 71/021: {Carbon} - B01D 71/027: {Silicium oxide} - B01D 71/028: {Molecular sieves (carbon B01D71/021)} - B01D 71/54: Polyureas; Polyurethanes - B01D 71/70: Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only - B01D 2053/224: {with hollow fibres} - 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) ## Abstract A gas separation membrane includes a composite membrane, the composite membrane including: a gas separation functional layer; and a compound having a composition different from a compound constituting the gas separation functional layer, wherein the presence ratio of the gas separation functional layer at at least one surface of the gas separation membrane is not less than 90% and less than 100%. Provided is a gas separation membrane capable of suppressing damage of the gas separation functional layer during the preparation process of a gas separation membrane module or during the use of a gas separation membrane module even when the gas separation functional layer includes a site having low strength. ## Claims ### Claim at position 1 1-11. (canceled) ### Claim 12 A gas separation membrane comprising a composite membrane, the composite membrane comprising: a gas separation functional layer; and a composite compound different from a compound constituting the gas separation functional layer, wherein a presence ratio of the gas separation functional layer at at least one surface of the gas separation membrane is not less than 90.0% and less than 100%. ### Claim 13 (depends on 12) The gas separation membrane according to claim 12, wherein the composite membrane is placed on at least one surface of the gas separation membrane; a support is placed on another surface; and the presence ratio of the gas separation functional layer on the surface A is not less than 90.0% and less than 100%. ### Claim 14 (depends on 13) The gas separation membrane according to claim 13, wherein the support is a porous support. ### Claim 15 (depends on 12) The gas separation membrane according to claim 12, wherein the gas separation membrane is a hollow fiber membrane, and an inner diameter of the composite membrane is 10 μm to 2,000 μm. ### Claim 16 (depends on 12) The gas separation membrane according to claim 12, wherein a size of at least part of the composite compound is 0.1 μm to 100 μm on the surface of the gas separation membrane. ### Claim 17 (depends on 12) The gas separation membrane according to claim 12, wherein a compound constituting the gas separation functional layer is a polymer compound, and the composite compound is an inorganic compound. ### Claim 18 (depends on 12) The gas separation membrane according to claim 12, wherein a compound constituting the gas separation functional layer is an inorganic compound, and the composite compound is an organic compound. ### Claim 19 (depends on 12) The gas separation membrane according to claim 12, wherein the composite compound is one or more compounds selected from the group consisting of silica, phenolic resins, and urethane resins. ### Claim 20 (depends on 12) The gas separation membrane according to claim 12, wherein thickness of the gas separation functional layer is 0.01 μm to 10 μm. ### Claim 21 (depends on 12) A gas separation membrane module in which the gas separation membrane according to claim 12 is placed, wherein a distance between vicinal composite membranes is 10 μm to 2,000 μm. ### Claim 22 A method of producing a gas separation membrane comprising a composite membrane, the composite membrane comprising: a gas separation functional layer; and a composite compound different from a compound constituting the gas separation functional layer, the method comprising: passing a gas or solution as a substrate of the composite compound, into a space separated by a membrane comprising an uncombined membrane; and passing a gas that cures the gas or solution as the substrate of the composite compound, into another space separated by the uncombined membrane.