ABSORBENT FOR SEPARATION OF CARBON DIOXIDE

摘要

A carbon dioxide separating absorbent for separation of carbon dioxide from a mixed gas, which maintains high absorptivity of carbon dioxide, can reduce regenerated energy, and does not have demerits such as corrosion of an apparatus, is provided. A mixing absorbent for separation of carbon dioxide comprises: (i) a compound represented by a chemical formula 1 having at least one functional group of an amino group, a carboxylic acid salt and a hydroxyl group bonded to a tertiary carbon atom within a molecule, or a compound represented by a chemical formula 2 having at least one functional group of an amino group and a carboxylic acid salt bonded to a quaternary carbon atom within the molecule; and (ii) an amine-based compound for accelerating the reaction. In chemical formula 1 and the chemical formula 2, R1 to R8 are independently hydrogen or a lower alkyl with 1 to 2 carbon atoms, and n is an integer of 0 to 2.