Carbon dioxide electrolytic device

A carbon dioxide electrolytic device, comprising:

• an electrochemical reaction cell including:
• a first accommodation part configured to accommodate gas containing carbon dioxide or a first electrolytic solution containing carbon dioxide;
• a second accommodation part configured to accommodate a second electrolytic solution containing water;
• a diaphragm provided between the first accommodation part and the second accommodation part;
• a cathode arranged to be in contact with the gas or the first electrolytic solution and configured to reduce carbon dioxide to produce a carbon compound;
• and an anode arranged to be in contact with the second electrolytic solution and configured to oxidize water to produce oxygen;
• a first supply part to supply the gas or the first electrolytic solution to the first accommodation part;
• a second supply part to supply the second electrolytic solution to the second accommodation part;
• a first carbon dioxide separation part that is connected to a discharge portion to discharge a discharge containing oxygen and carbon dioxide from the second accommodation part and includes a cryogenic separation device to separate the carbon dioxide from a gas component in the discharge;
• and
• a cooling part configured to cool a cooling water for cooling at least a part of the electrochemical reaction cell by using, as a cooling medium, a gas, liquid, or solid mainly containing the carbon dioxide separated in the cryogenic separation device, or a residual gas from which the carbon dioxide has been separated in the cryogenic separation device.