Acidic gas absorbent, acidic gas removal device, and acidic gas removal method

An acidic gas absorbent comprising a heteroaromatic ring compound represented by any one of the following general formula (2) and general formula (3), and a primary or secondary amine compound:

• wherein in the general formula (2) and general formula (3), R1s each represent any one selected from a hydrogen atom, an alkyl group, and an aromatic group;
• R1s may be identical with or different from each other;
• R2 represents an OR3 group or a NR42 group;
• R3 and R4 each represent any one selected from a hydrogen atom, an alkyl group, and an aromatic group;
• and R4s may be identical with or different from each other.

A method for removing an acidic gas, the method comprising bringing a gas containing an acidic gas into contact with an acidic gas absorbent liquid which is prepared by dissolving an acidic gas absorbent containing an azabicyclo compound represented by the following general formula (1) and a primary or secondary amine compound in a solvent;

• and removing the acidic gas from the gas containing the acidic gas:
• wherein in the general formula (1), p and q each represent an integer of 1 or greater;
• m and n each represent an integer of 0 or greater;
• and the combination of X and Y represents any one of a combination of a nitrogen atom and a carbon atom, a combination of a carbon atom and a carbon atom, and a combination of a carbon atom and a nitrogen atom.

A method for removing an acidic gas, the method comprising bringing a gas containing an acidic gas into contact with an acidic gas absorbent liquid which is prepared by dissolving an acidic gas absorbent containing a heteroaromatic ring compound represented by any one of the following general formula (2) and general formula (3) and a primary or secondary amine compound in a solvent;

• and removing the acidic gas from the gas containing the acidic gas:
• wherein in the general formula (2) and general formula (3), R1s each represent any one selected from a hydrogen atom, an alkyl group, and an aromatic group;
• R1s may be identical with or different from each other;
• R2 represents an OR3 group or a NR42 group;
• R3 and R4 each represent any one selected from a hydrogen atom, an alkyl group, and an aromatic group;
• and R4s may be identical with or different from each other.