METHOD FOR RECOVERING CARBON DIOXIDE GAS AND OTHER GASES

• Main Authors: KUSUNOKI, Masao, TANAKA, Hiroki, TAMAKI, Yoshimi, TSUNODA, Dai
• Format: Patent
• Language: English
• Published: 28.07.2022
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The present invention provides a method including: a gas absorption step of bringing exhaust gas into contact with an aqueous solution containing alkaline carbonate, so that carbon dioxide gas in the exhaust gas is allowed to react therewith, thereby obtaining an aqueous solution containing alkaline bicarbonate; a gas recovery step of recovering a gas containing nitrogen gas and oxygen gas obtained as a result of the gas absorption step; a decomposition step of decomposing at least a part of the alkaline bicarbonate obtained in the gas absorption step into the alkaline carbonate and the carbon dioxide gas; a circulation step of circulating at least a part of the alkaline carbonate obtained in the decomposition step to the gas absorption step; and a carbon dioxide gas recovery step of bringing a gas containing the carbon dioxide gas obtained as a result of the decomposition step into contact with an aqueous solution, thereby recovering the carbon dioxide gas obtained in the decomposition step.