Two-phase absorbent for capturing CO2 and application of two-phase absorbent

The invention discloses a two-phase absorbent for capturing CO2 and application of the two-phase absorbent. The two-phase absorbent is a ternary system composed of aminoethylpiperazine, sulfolane and water, the content of aminoethylpiperazine accounts for 20% of the total volume, and the volume ratio of sulfolane to water is 1:3 to 3:1; and the ternary system is a homogeneous solution before absorbing CO2 and is divided into an upper phase and a lower phase after absorbing CO2, the upper phase is a rich phase enriched with CO2, and the lower phase is a lean phase. In application, only one phase rich in CO2 needs to be transferred to the regeneration tower for regeneration, so that the volume of the regeneration liquid is greatly reduced, and the energy consumption is reduced. The system has low viscosity, is beneficial to separation, reduces equipment loss, and has wide application prospects. 本发明公开了一种用于捕集CO2的双相吸收剂及其应用。该双相吸收剂为由氨乙基哌嗪、环丁砜和水组成的三元体系，所述氨乙基哌嗪的含量占总体积的20％，所述环丁砜与水的体积比为1:3～3:1；所述三元体系在吸收CO2前为均相溶液，吸收CO2后分