| 초록 |
Although aqueous ammonia solution has been focused on the removal of CO2 from flue gas, there have been very few reports regarding the underlying analysis of the reaction between CO2 and NH3. In this report, aqua ammonia process was operated at various temperatures i.e. 40oC, 20oC, and 5oC. The CO2 removal efficiencies and the loss of ammonia were influenced by the operating temperatures. Also, infrared spectra and pH measurement were used for the understanding of formation mechanism of ion species in absorbent, such as NH2COO-, HCO3-, CO32-, and NH4+, during CO2 and NH3 reaction. The reaction CO2-NH3 at 20oC and 40oC has the similar reaction routes. However, the different reaction route was observed at 5oC compared to the other operating temperatures, displaying reaction product of ammonium bicarbonate solid was observed relatively after reaction time of 120 min. The CO2 removal efficiencies and the formation of carbamate and bicarbonate were strongly influenced by the operating temperatures. In particular, the analysis of the formation carbamate and bicarbonate by infrared spectra and pH measurement provides useful information on the reaction mechanism of CO2 and NH3 in aqueous solutions. |
