Impact of speciation on CO_2 capture performance using blended absorbent containing ammonia, triethanolamine and 2-amino-2-methyl-1-propanol

摘要

In our previous study, a high CO_2 absorption rate was achieved using a blended absorbent containing AMP, NH_3, and TEA. The species of the blended absorbent was determined in this study using ~(13)C nuclear magnetic resonance (NMR) spectroscopy and a modified Kent-Eisenberg model. The carbamate formation constant was also regressed using the model. Bicarbonate and carbonate ions decrease the absorption efficiency and have a positive effect on CO_2 stripping. Carbamate has a negative effect on regeneration; a regeneration temperature of 373 K minimized the energy needed. In conclusion, the prediction equation and NMR analysis provide an easy way of determining carbonate group species and carbamate species concentrations, and this method will be helpful in optimizing CO_2 capture with blended absorbents.