Amine mixtures and the effect of additives on the CO2 capture rate

Two factors were identified that lead to the enhancement of CO2 mass transfer. The first factor was the alkanolamine and amino acid used have faster reactions with CO2 than ammonia. The second was the presence of ammonia in a high concentration provides additional sites for proton accepting; allowing more of the added alkanolamine or amino acid to react with CO2. This theory is supported by C13 NMR data.