ABSORPTION LIQUID, METHOD FOR PREPARING ABSORPTION LIQUID, AND DEVICE AND METHOD FOR REMOVING CO2 OR H2S OR BOTH

摘要

An absorption liquid which absorbs the CO2 or H2S or both contained in a gas, and which comprises 1) at least one tertiary-monoamine main-ingredient compound selected from among tertiary monoamines and 2) at least one secondary-diamine first-auxiliary compound selected from among secondary diamines, the secondary-diamine concentration being within the range of 0.05-0.5 in terms of the auxiliary concentration index represented by the following numerical formula (I). (Auxiliary concentration index) = [(secondary-diamine acid dissociation index) (pKa)/(tertiary-monoamine acid dissociation index) (pKa)] (index ratio) × [(secondary-diamine molar concentration) (mol/L)/(tertiary-monoamine molar concentration) (mol/L)] (molar ratio) (I)