Abstract
Post-combustion carbon dioxide (CO2) capture using amine-based absorbents has been considered as the most promising technology to effectively capture CO2 from coal-fired power plants. In this technology, an ideal absorbent should have both high absorption/desorption efficiency and low regeneration energy penalty. In this study, a set of simplified experiments was devised to evaluate the overall capture performances of five absorbents, including 30wt% monoethanolamine (MEA) solution, piperazine/diethylenetriamine/water (PZ/DETA/H2O) solution, piperazine/diethylenetriamine/diethylene glycol/water (PZ/DETA/DEG/H2O) blend, piperazine/diethylenetriamine/methanol/water (PZ/DETA/MeOH/H2O) blend, and piperazine/diethylenetriamine/methanol (PZ/DETA/MeOH) solution. Among the five absorbents, the novel PZ/DETA/MeOH/H2O blend achieved high absorption efficiency, high desorption efficiency, and low regeneration energy penalty. In addition, this blend did not suffer the problems of PZ crystal formation in absorbents at low temperature (10-30oC) and precipitation in CO2-rich solution. Therefore, this novel PZ/DETA/MeOH/H2O blend can be considered as a potential candidate for CO2 capture reagent.