In the present work, a stopped-flow apparatus was used to determine the CO2 absorption kinetics of 4-diethylamine-2-butanol (DEAB) in terms of observed pseudo-first-order rate constant (k(0)) and second order reaction rate constant (k(2)). The experiments were done using DEAB in the concentration range of 0.10-0.90 kmol/m(3), and a temperature range of 293-313 K. The pK(a) of DEAB was also experimentally determined over a temperature range of 278-333 K. The Bronsted relationship between the reaction rate constant obtained from the stopped-flow apparatus and pK(a) obtained from experimental determination was then evaluated. The results showed that the Bronsted correlation could predict the absorption rate constant with an MD of 8.6%, which is within an acceptable range of 10%. By comparing through different evaluation techniques such as k(2), pK(a) and Delta(r)G(m)(o), it was observed that DEAB has faster reaction kinetics than those of conventional tertiary amines, namely, DEMEA, DMMEA and MDEA. (C) 2014 Elsevier B.V. All rights reserved.