US 11,655,549 B2
Carbon dioxide treatment apparatus, carbon dioxide treatment method, and method for producing carbon compound
Yuta Shimada, Wako (JP); and Hiroshi Oikawa, Wako (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Feb. 15, 2022, as Appl. No. 17/671,627.
Claims priority of application No. 2021 -048648 (JP), filed on Mar. 23, 2021.
Prior Publication US 2022/0307145 A1, Sep. 29, 2022
Int. Cl. C25B 3/26 (2021.01); C25B 9/19 (2021.01); C25B 13/00 (2006.01); C25B 3/03 (2021.01); C25B 9/67 (2021.01)
CPC C25B 3/26 (2021.01) [C25B 3/03 (2021.01); C25B 9/19 (2021.01); C25B 9/67 (2021.01); C25B 13/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A carbon dioxide treatment apparatus comprising:
a recovery device configured to recover carbon dioxide;
an electrochemical reaction device configured to electrochemically reduce carbon dioxide; and
a pH adjuster,
wherein the recovery device includes an absorption part in which an anode side electrolytic solution composed of an alkaline aqueous solution and carbon dioxide gas are brought into contact with each other so that the carbon dioxide is dissolved and absorbed in the anode side electrolytic solution, and a concentration part that concentrates carbon dioxide,
the electrochemical reaction device includes an anode, a cathode, an anion exchange membrane provided between the anode and the cathode, a liquid flow path provided between the anode and the anion exchange membrane and through which the anode side electrolytic solution that has absorbed the carbon dioxide in the absorption part flows, and a liquid flow path provided between the cathode and the anion exchange membrane and through which a cathode side electrolytic solution composed of an alkaline aqueous solution of which a pH has been adjusted by the pH adjuster flows, the pH of the cathode side electrolytic solution being higher than that of the anode side electrolytic solution, and
the carbon dioxide gas is supplied from the concentration part to a gas flow path on a side of the cathode opposite to the anode, and the carbon dioxide gas is reduced at the cathode.