CO2 absorption into MEA-AMP blend: Mass transfer and absorber height index

A parametric study of CO2 absorption into aqueous solutions of monoethanolamine (MEA)-2-amino-2-methyl-1-propanol (AMP) blends was conducted to obtain a much-needed mass transfer data for process design. It was found that the overall mass transfer coefficient (KGae) generally increases with liquid flow rate, temperature and total amine concentration (except at high CO2 loading of above 0.35 mol/mol). It however decreases with CO2 partial pressure and CO2 loading. Higher MEA concentration in the MEA-AMP blends causes KGae to increase, but this trend reverses at high CO2 loadings. An empirical correlation of KGae was subsequently developed as a function of process parameters.