ACIDIC GAS ABSORBENT, ACIDIC GAS REMOVAL METHOD, AND ACIDIC GAS REMOVAL DEVICE

To provide an acidic gas absorbent or the like that has a large recovery amount of acidic gas and is difficult to dissipate.SOLUTION: There is provided an acidic gas absorbent which contains secondary heterocyclic amine in an equation (1) or (2) and alkanolamine in an equation (3). There is also provided an acidic gas removal method and removal device using the absorbent. (3) HNR4R5. R1, R2 are hydrogen, a hydroxy group, a hydroxyalkyl group or aminoalkyl group of C1-C6 (however, at least one of R1, R2 is the hydroxyalkyl group or aminoalkyl group). R3 is hydrogen, the hydroxy group, the hydroxyalkyl group or aminoalkyl group of C1-C6 (however, at least one of R3 is the hydroxyalkyl group or aminoalkyl group). R4 is a branched or cyclic alkyl group of C1-C8. R5 is an alkyl group that has two or more hydroxy groups of C1-C6. p is 2-4. q is 3-6.SELECTED DRAWING: None 【課題】酸性ガスの回収量が多く、放散しにくい酸性ガス吸収剤等を提供する。【解決手段】式（１）又は（２）の第二級ヘテロ環状アミンと、式（３）のアルカノールアミンを含む、酸性ガス吸収剤。該吸収剤を用いる酸性ガス除去方法及び除去装置。TIFF2024097213000008.tif42170（３）ＨＮＲ４Ｒ５Ｒ１、Ｒ２は、水素、水酸基、Ｃ１～６のヒドロキシアルキル基又はアミノアルキル基（但し、Ｒ１、Ｒ２の少なくとも一つは上記ヒドロキシアルキル基又はアミノアルキル基）。Ｒ３は、水素、水酸基、Ｃ１～６のヒドロキシアルキル基又はアミノアルキル基（但し、Ｒ３の少なくとも一つは上記ヒドロキシアルキル基又はアミノアルキル基）。Ｒ４は、Ｃ１～８の分岐状又は環状のアルキル基。Ｒ５は、Ｃ１～６の、水酸基を２つ以上有するアルキル基。ｐは２～４。ｑは３～６。【選択図】なし