# US 10,245,552 B2 · Method for separating carbon dioxide and apparatus for separating carbon dioxide

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,245,552 B2
- Document ID: US10245552B2
- Status: Granted
- Kind: B2
- Application number: 15/736,599
- Filed: 2016-06-17
- Published: 2018-07-05
- Granted: 2019-04-02
- Earliest claimed: 2015-06-18
- Assignees: Sumitomo Chemical Company, Limited; Renaissance Energy Research Corporation
- Applicants: Sumitomo Chemical Company, Limited; Renaissance Energy Research Corporation
- Inventors: Nobutaka Kodama; Emi Okubo; Osamu Okada; Nobuaki Hanai
- Web page: https://patentgrep.com/patent/US10245552B2

## 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 63/02: Hollow fibre modules
- B01D 63/06: Tubular membrane modules
- B01D 63/107: {Specific properties of the central tube or the permeate channel}
- B01D 69/00: Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D 69/142: {with "carriers"}
- B01D 69/148: {Organic/inorganic mixed matrix membranes}
- B01D 2053/221: {Devices}
- B01D 2053/223: {with hollow tubes}
- B01D 2053/224: {with hollow fibres}
- B01D 2256/16: Hydrogen
- B01D 2257/504: Carbon dioxide
- H01M 8/0618: {Reforming processes, e.g. autothermal, partial oxidation or steam reforming}
- H01M 8/0668: Removal of carbon monoxide or carbon dioxide
- H01M 8/0687: {Reactant purification by the use of membranes or filters}
- Y02C 20/40: of CO2
- Y02E 60/50: Fuel cells
- 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)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A carbon dioxide separation method including the steps of: feeding a mixed gas that contains at least carbon dioxide and water vapor to a carbon dioxide separation membrane that contains a hydrophilic resin and a carbon dioxide carrier; separating, from the mixed gas, a permeation gas that contains the carbon dioxide by use of the carbon dioxide separation membrane; adjusting temperature of gas which contacts the carbon dioxide separation membrane so that a temperature difference between the mixed gas and the permeation gas is not lower than 0° C. and not higher than 20° C.; and adjusting pressure of the permeation gas, the pressure of the permeation gas and water vapor partial pressure in the mixed gas satisfying the following formula (1): 2.5 kPaA<(pressure of permeation gas)<(water vapor partial pressure in mixed gas) . . . (1).

## Claims

### Claim 1

A carbon dioxide separation method comprising the steps of:
feeding a mixed gas that contains at least carbon dioxide and water vapor to a carbon dioxide separation membrane that contains a hydrophilic resin and a carbon dioxide carrier;
separating, from the mixed gas, a permeation gas that contains the carbon dioxide by use of the carbon dioxide separation membrane;
adjusting temperature of gas which contacts the carbon dioxide separation membrane so that a temperature difference between the mixed gas fed to the carbon dioxide separation membrane and the permeation gas which has permeated the carbon dioxide separation membrane is not lower than 0° C. and not higher than 20° C.; and
adjusting pressure of the permeation gas which has permeated the carbon dioxide separation membrane,
the pressure of the permeation gas which has permeated the carbon dioxide separation membrane and water vapor partial pressure in the mixed gas fed to the carbon dioxide separation membrane satisfying the following formula (1):
2.5 kPaA<(pressure of permeation gas)<(water vapor partial pressure in mixed gas) (1).

### Claim 2 (depends on 1)

The carbon dioxide separation method as set forth in claim 1, wherein
the pressure of the permeation gas which has permeated the carbon dioxide separation membrane is adjusted by a pressure adjusting section.

### Claim 3 (depends on 1)

The carbon dioxide separation method as set forth in claim 1, wherein
the pressure of the permeation gas which has permeated the carbon dioxide separation membrane is adjusted by utilizing a pressure drop due to a flow channel structure for the permeation gas.

### Claim 4 (depends on 1)

The carbon dioxide separation method as set forth in claim 1, wherein
the temperature of the gas which contacts the carbon dioxide separation membrane is adjusted by a temperature adjusting section.

### Claim 5 (depends on 1)

The carbon dioxide separation method as set forth in claim 1, wherein
the water vapor partial pressure in the mixed gas fed to the carbon dioxide separation membrane and the pressure of the permeation gas which has permeated the carbon dioxide separation membrane further satisfy the following formula (2):
(water vapor partial pressure in mixed gas)×0.25<(pressure of permeation gas)<(water vapor partial pressure in mixed gas) (2).

### Claim 6 (depends on 1)

The carbon dioxide separation method as set forth in claim 1, wherein
the mixed gas fed to the carbon dioxide separation membrane is at a temperature of not lower than 50° C. and not higher than 140° C., and at a relative humidity of not lower than 50% RH and not higher than 100% RH.

### Claim 7 (depends on 1)

A carbon dioxide separation apparatus used in a carbon dioxide separation method according to claim 1, the carbon dioxide separation apparatus comprising:
at least one carbon dioxide separation membrane module which has a structure partitioned into a feed side and a permeate side by the carbon dioxide separation membrane that contains the hydrophilic resin and the carbon dioxide carrier;
a temperature adjusting section which adjusts a temperature difference between the mixed gas fed to a feed-side inlet of the at least one carbon dioxide separation membrane module and the permeation gas discharged from a permeate-side outlet of the at least one carbon dioxide separation membrane module; and
a pressure adjusting section which adjusts the pressure of the permeation gas discharged from the permeate-side outlet.

### Claim 8 (depends on 7)

The carbon dioxide separation apparatus as set forth in claim 7, wherein
the carbon dioxide carrier is made of at least one compound selected from the group consisting of alkali metal carbonate, alkali metal bicarbonate, and alkali metal hydroxide.

### Claim 9 (depends on 7)

The carbon dioxide separation apparatus as set forth in claim 7, wherein
the carbon dioxide carrier contains at least one of cesium carbonate and cesium hydroxide.

### Claim 10 (depends on 7)

The carbon dioxide separation apparatus as set forth in claim 7, wherein
the carbon dioxide separation membrane has a hollow-fiber form, a tubular form or a spiral-wound form.

### Claim 11 (depends on 7)

The carbon dioxide separation apparatus as set forth in claim 7, further comprising a temperature and humidity adjusting section which adjusts temperature of and relative humidity of the mixed gas fed to the carbon dioxide separation membrane.