The kinetics of the reactions of carbon dioxide (CO2) with aqueous solutions of two different sterically hindered amines (SHAs), 2-amino-2-ethyl-1,3-propanediol (AEPD) and 2-amino-2-methyl-1,3-propanediol (AMPD), in the presence and absence of carbonic anhydrase (CA) was investigated experimentally using stopped-flow conductimetry. The amine concentration, CA concentration, and temperature were varied within the ranges of 0.1-0.5 kmol center dot m(-3), 0-125 g center dot m(-3), and 298-353 K, respectively. Based on pseudo first-order reaction conditions, the intrinsic reaction rate (k(o)) was obtained according to a modified termolecular reaction mechanism. The obtained results showed that the reaction rate between the SHA solutions (either aqueous AEPD or aqueous AMPD) and CO(2)was enhanced significantly upon adding small amounts of CA as a promoter. Such a result supports the use of the aforementioned solvent system as a candidate for CO(2)capture. (c) 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.