Electrochemical reaction device

Patent metadata

Field	Value
Publication number	US-12247304-B2
Application number	US-202318469876-A
Country	US
Kind code	B2
Filing date	Sep 19, 2023
Priority date	Sep 17, 2019
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

An electrochemical reaction device includes: a first reactor including a first room and a second room, the first room being configured to store a gas containing carbon dioxide or a first electrolytic solution containing carbon dioxide, and the second room being configured to store a second electrolytic solution containing water; a cathode disposed in the first room, the cathode being configured to reduce the carbon dioxide and thus produce a reduction product; an anode disposed in the second room, the anode being configured to oxidize the water and thus produce an oxidation product; a first pressure adjuster configured to adjust pressure in the first room; a temperature detector configured to detect a temperature in the first reactor to form a detection signal; and a controller configured to control the pressure adjuster in accordance with the detection signal from the temperature detector.

First claim

What is claimed is:

1. A method of controlling an electrochemical reaction device,
the device comprising:
a first reactor having a first flow path, a second flow path, and a diaphragm, the first flow path defining a first room, the second flow path defining a second room, the diaphragm being provided between the first flow path and the second flow path;
a cathode facing on the first flow path; and
an anode facing on the second flow path;
the method comprising:
supplying a gas containing carbon dioxide to the first flow path and supplying an electrolytic solution to the second flow path;
reducing the carbon dioxide with the cathode to generate a reduction product; and
detecting a temperature of the physical exterior of the first reactor and adjusting a pressure in the first room in accordance with the detected temperature,
wherein the pressure in the first room is adjusted so that the pressure in the first room is increased in response to an increase of the detected temperature.

2. The method according to claim 1 , wherein
the diaphragm has a porous membrane.

3. The method according to claim 1 , wherein
the temperature of the first reactor is detected by a temperature detector on the first reactor.

4. The method according to claim 1 , wherein the device comprises a plurality of the first reactors.

5. The method according to claim 1 , wherein the temperature of the first reactor is 60° C. or more and 150° C. or less.

6. The method according to claim 1 , wherein a concentration of the carbon dioxide to be supplied to the first room is 5% or more and 20% or less in volume percent.

7. The method according to claim 1 , wherein a concentration of the carbon dioxide to be supplied to the first room is 5% or more and 20% or less in volume percent, and a pressure of the carbon dioxide to be supplied to the first room is 3 atm or more.

8. The method according to claim 1 , wherein a difference between the temperature of the first reactor and the temperature of the carbon dioxide to be supplied to the first room is within 20° C.

9. The method according to claim 1 , wherein the device further comprises:
a second reactor in which the reduction product reacts.

10. The method according to claim 9 , wherein a temperature of the reduction product to be supplied to the second reactor is 60° C. or more and 150° C. or less.

11. The method according to claim 1 , wherein
the reduction product includes carbon dioxide, carbon monoxide, and hydrogen, and
a concentration of the hydrogen of the reduction product is 0.1% or more and less than 5% in volume percent.

12. The method according to claim 1 , wherein the pressure in the first room is adjusted to 0.1 MPa or more and 6.4 MPa or less.

13. The method according to claim 1 , wherein a pressure in the second room is adjusted.

14. The method according to claim 13 , wherein a difference between the pressures in the first and second rooms is adjusted to within 0.5 MPa.

15. The method according to claim 13 , wherein a current density of the cathode when the carbon dioxide is reduced, is 100 mA/cm 2 or more and 1.5 A/cm 2 or less.

16. The method according to claim 1 , wherein
the electrolytic solution includes water, and
the water is oxidized with the anode to generate a oxidization product.

17. The method according to claim 1 , wherein the first flow path is configured to allow a gas containing carbon dioxide to flow in an entirely gaseous stream.

Assignees

• Toshiba Kk

Inventors

• Mikoshiba Satoshi
• MOTOSHIGE Asahi
• Kitagawa Ryota
• Ono Akihiko
• Kofuji Yusuke
• Kudo Yuki
• Yamagiwa Masakazu

Classifications

• C25B1/04 Primary

  by electrolysis of water · CPC title

• C25B9/73

  of the filter-press type · CPC title

• C25B9/77

  having diaphragms · CPC title

• C25B3/25

  Reduction · CPC title

• C25B1/00

  Electrolytic production of inorganic compounds or non-metals · CPC title