Reaction Kinetics of Carbon Dioxide (CO₂) with Diethylenetriamine and 1-Amino-2-propanol in Nonaqueous Solvents Using Stopped-Flow Technique

In this work, the reaction kinetics of carbon dioxide (CO₂) with diethylenetriamine (DETA) and 1-amino-2-propanol (1-AP) in methanol and ethanol systems were measured using the stopped flow technique over a temperature range of 293-313 K in terms of pseudo-first-order rate constant (k₀). Concentration in the range of 10 to 50 mol/m³ for diethylenetriamine, and 20 to 100 mol/m³ for 1-amino-2-propanol were studied. The experimental data show that the pseudo-first-order rate constants (k₀) increase with the increase of both amine concentration and temperature. The zwitterion mechanism and the termolecular mechanism were used to represent the data for DETA in methanol and ethanol systems with excellent ADDs of 3.5% and 2.4%, respectively, and 1-AP in methanol and ethanol systems with excellent ADDs of 2.4% and 2.6%, respectively. In comparison with EDA and AEEA in terms of k₂, DETA exhibits a better reaction kinetics performance for capturing CO₂. Those results will be useful in finding an efficient method for the removal of CO₂ from industrial gases.