Abstract:

Carbon dioxide（CO₂）absorption performance was investigated in a total 40% amine solution of piperazine（PZ），N-aminoethyl piperazine（N-AEPZ）and hydroxyethyl piperazine（HEPZ）. The CO₂ absorption performance was also carried out in aqueous amine solutions with mass content of 30%AEE+10%PZ，30%AEE+10% N-AEPZ and 30%AEE+10%HEPZ. The absorption process was estimated by the correlation with absorption rate，absorption capacity，absorption time，PZ content and system temperature. The absorption temperature was controlled at 313 K. The desorption temperature was controlled at 393K to estimate the interrelation of desorption capacity and desorption time. It was observed that molecules with amino group can help improving absorption capability. In the composite system，N-AEPZ is the main absorbent，PZ and AEE absorb CO₂ together；in the 30%AEE+10%HEPZ amine solution，AEE is the main absorbent. The increase in main absorbent component concentration can improve the absorption capacity. The mixed solution of 30%AEE+10%PZ showed a good actual operation both in absorption and desorption process.