# US 10,441,917 B2 · Gas separation method

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- Number: US 10,441,917 B2
- Document ID: US10441917B2
- Status: Granted
- Kind: B2
- Application number: 16/130,626
- Filed: 2018-09-13
- Published: 2019-03-21
- Granted: 2019-10-15
- Earliest claimed: 2017-09-15
- Assignees: Sumitomo Chemical Company, Limited; Renaissance Energy Research Corporation
- Applicants: Sumitomo Chemical Company, Limited; Renaissance Energy Research Corporation
- Inventors: Takenori Kitaura; Hisaaki Miyamoto; Yudai Ota; Takehiro Nakasuji; Osamu Okada; Masaaki Teramoto
- Web page: https://patentgrep.com/patent/US10441917B2

## CPC

- B01D 53/228: {characterised by specific membranes}
- 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 63/107: {Specific properties of the central tube or the permeate channel}
- B01D 69/1213: {Laminated layers}
- B01D 69/142: {with "carriers"}
- B01D 69/145: {containing embedded catalysts}
- B01D 71/381: {Polyvinylalcohol}
- B01D 71/383: {Polyvinylacetates}
- B01D 71/401: {Polymers based on the polymerisation of acrylic acid, e.g. polyacrylate}
- B01D 71/404: {Polymers based on the polymerisation of crotonic acid}
- B01D 71/68: Polysulfones; Polyethersulfones
- B01D 71/76: Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 (rubbers in general B01D71/24)
- B01D 71/82: characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
- B01D 2256/16: Hydrogen
- B01D 2257/504: Carbon dioxide
- B01D 2311/04: Specific process operations in the feed stream; Feed pretreatment
- B01D 2311/08: Specific process operations in the concentrate stream
- B01D 2311/103: Heating
- B01D 2311/14: Pressure control
- B01D 2311/2626: Absorption or adsorption
- B01D 2311/2669: Distillation
- B01D 2313/23: Specific membrane protectors, e.g. sleeves or screens
- B01D 2323/21813: Metal oxides
- B01D 2323/21817: Salts
- B01D 2325/36: Hydrophilic membranes
- C01B 2203/0233: the reforming step being a steam reforming step
- C01B 2203/0475: the impurity being carbon dioxide
- Y02C 20/40: of CO2
- Y02P 30/00: Technologies relating to oil refining and petrochemical industry
- 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)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Provided is a method for separating, from a raw gas containing a specific gas, the specific gas using a gas separation membrane module. The gas separation membrane module includes a housing and a gas separation membrane element enclosed in the housing. The gas separation membrane element includes a gas separation membrane including a hydrophilic resin composition layer for selectively allowing for permeation of the specific gas. The method includes the steps of: increasing pressure in an interior of the gas separation membrane module; increasing a temperature in the interior of the gas separation membrane module; and feeding a raw gas to the interior of the gas separation membrane module in that order.

## Claims

### Claim 1

A method for separating, from a raw gas containing a specific gas, the specific gas using a gas separation membrane module,
the gas separation membrane module including a housing and a gas separation membrane element enclosed in the housing,
the gas separation membrane element including a gas separation membrane including a hydrophilic resin composition layer for selectively allowing for permeation of the specific gas,
the method comprising the steps of:
increasing a pressure in an interior of the gas separation membrane module;
increasing a temperature in the interior of the gas separation membrane module; and
feeding the raw gas to the interior of the gas separation membrane module, in that order.

### Claim 2 (depends on 1)

The method according to claim 1, wherein in the step of increasing a pressure, an inert gas is fed to increase the pressure in the interior of the gas separation membrane module.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the inert gas has a water partial pressure lower than a maximum saturation water vapor pressure in the step of increasing a pressure.

### Claim 4 (depends on 1)

The method according to claim 1, wherein in the step of increasing a pressure, the pressure on a feed side in the interior of the gas separation membrane module is increased.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the raw gas contains water vapor.

### Claim 6 (depends on 5)

The method according to claim 5, wherein in the step of increasing a temperature, the temperature in the interior of the gas separation membrane module is increased to a temperature higher than a dew point of the raw gas in the step of feeding the raw gas.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the hydrophilic resin composition layer contains a hydrophilic resin and an acidic gas carrier capable of reversibly reacting with an acidic gas.

### Claim 8 (depends on 1)

The method according to claim 1, further comprising the steps of:
discharging a retentate gas that has not permeated through the gas separation membrane from the gas separation membrane module; and
purifying the retentate gas.

### Claim 9 (depends on 8)

The method according to claim 8, wherein in the step of purifying the retentate gas, the purifying is conducted by at least one method selected from the group consisting of an adsorption method, a physical absorption method, a chemical absorption method, a distillation method, and a cryogenic separation method.