Effect of the presence of trace sulfur dioxide on piperazine-based amine absorbents for carbon dioxide capture
Authors: Songtao Zheng, Yao Jiang, Shaojun Jia, Yan Wu, Peng Cui
The effect of the presence of trace SO2 in industrial flue gas on the amine-scrubbing-based absorption process for CO2 capture has been a matter of concern. This study aimed to investigate the effect of trace SO2 on the CO2 capture process using piperazine-based amine absorbents, focusing on SO2-resistance capability, SO2/CO2 absorption selectivity, and cyclic stability. The presence of trace SO2 not only restrains CO2 absorption, but also promotes the formation of carbamate within the piperazine-based amine absorbents. Remarkably, the incorporation of aminoethyl group in piperazine-based amine absorbents can enhance the SO2-resistance capability by promoting the formation of carbamate, while piperazine-based amine absorbents with hydroxyethyl group can promote the formation of bicarbonate to reduce the SO2-resistance capability. The work offers valuable insights into the efficient application of novel amine absorbents for CO2 capture from practical industrial flue gas.
