Removal of carbon dioxide by absorption into blended amines: kinetics of absorption into aqueous AMP/HMDA, AMP/MDEA, and AMP/piperazine solutions

Reaction rate constants between CO sub(2) and blended amines by measuring their absorption rate for CO sub(2) were determined. The experiments were carried out to investigate the characteristics of CO sub(2) absorption using additional absorbents namely, hexamethylenediamine (HMDA), N-methyldiethanolamine (MDEA) or piperazine blended into 2-amino-2-methyl-1-propanol (AMP) in an agitated vessel. It was observed that the additive concentrations of 1,3, and 5 wt% were added for each 30 wt% AMP solution. The results showed that the addition of HMDA, MDEA or piperazine into AMP increased the absorption rate as compared to AMP alone. It was found that HMDA showed the most enhancements in the reaction rate of AMP.