Reaction Kinetics of Carbon Dioxide with 2-Amino-1-butanol in Aqueous Solutions Using a Stopped-Flow Technique

Abstract

Carbon capture and management plays an important role in the development of new technologies to mitigate anthropogenic global warming. In this work, for the first time, the kinetics of CO2 with aminobutanol (AB) using a stopped-flow method are presented. The temperature changed from 293 to 313 K for a total amine concentration up to 0.3 mol/L. The kinetics data were analyzed using both zwitterion and termolecular reaction mechanisms with a preference to the zwitterion mechanism. AB was found to react with CO2 (aq) with k2 (M-1 s-1) = 2.93 � 109 exp(-4029.9/T (K)) with an estimated activation energy of 33.51 kJ/mol. Compared to other popular amines, CO2 reaction with aminobutanol has faster kinetics than that of CO2 with diethanolamine (DEA) and 2-amino-2-methyl-1-propanol (AMP) but slower than that with monoethanolamine (MEA). The Br?nsted relationship between the rate constant (k2) and pKa values was found to predict well the rate constant with an average absolute deviation (AAD) of 6.1%. - 2018 American Chemical Society.