Patent ID: 8419831

Claim:
A method for recovering carbon dioxide from a gas containing carbon dioxide, comprising: the step (1) of bringing a gas containing carbon dioxide into contact with an aqueous solution consisting essentially of 2-isopropylaminoethanol represented by formula (I): and at least one substance selected from the group consisting of piperazines represented by formula (II): wherein R2, R3, R5, and R6 are the same or different, and represent hydrogen, a C 1-2 alkyl group, an amino-substituted C 1-2 alkyl group, or a hydroxyl-substituted C 1-2 alkyl group; R1 and R4 represent hydrogen; and alkanolamines represented by formula (III): wherein R7, R8, and R9 are the same or different, and represent hydrogen, a C 1-2 alkyl group, an amino-substituted C 1-2 alkyl group, or a hydroxyl-substituted C 1-2 alkyl group, and R10 represents hydrogen to absorb carbon dioxide into the aqueous solution; and the step (2) of heating the aqueous solution containing carbon dioxide absorbed therein, which is obtained in step (1), to separate and recover carbon dioxide from the solution.