| abstract |
The composite amine-absorbing solution according to the present invention absorbs CO2 or H2S or both in a gas, and is obtained by dissolving (1) a linear monoamine, (2) a diamine, and (3) an amide group-containing compound in water. By adopting this composite amine-absorbing solution, entangling in a composite manner occurs, and due to these synergistic effects, the absorbency of CO2 or H2S or both is good, the dissipation properties of the absorbed CO2 or H2S when reusing the absorbing solution are good, and the amount of water vapor from a reboiler 26 used when reusing the absorbing solution in a CO2 recovery device 12 can be reduced. |