https://doi.org/10.1016/j.egypro.2017.03.1300
“Fig. 4 (left) shows the desirable char acters of novel amine solvents include a low heat of reaction, fast CO 2-
absorption rate, and large cyclic capacity for CO2 capture compared with conventional absorbent MEA, AMP, DEA
and MDEA. With these characteristics, CO2 can be separated from gas streams using less energy. In addition,
nuclear magnetic resonance (13C NMR) spectroscopy was used to analyze the CO2-absorbed amine solvents to
determine the ratios of produced carbamate and bicarbonate anions. Fig. 5 at (right) shows the results of 13C NMR
analysis. IPAE derivatives (IPAE, IPAP and IPAB) and formulated absorbents (RN-1, RN-2 & RN-3) mainly
absorbed CO 2 in the form of bicarbonate anion and the ratio of the bicarbonate anion to total absorbed CO 2 was in
between 90-100%. CO2 absorption by bicarbonate anion has an advantage of grater absorption capacity than CO2
absorption by a carbamate anion because bicarbonate anion is formed from one mole of CO2 and one mole of amine
in a reaction where water acts as a homogeneous catalyst. We established that the chemical structure of the amine
has a strong impact on the amine’s performance in CO2 capture.”
