The Kinetic Effect of Adding Piperazine Activator to Aqueous Tertiary and Sterically-hindered Amines Using Stopped-flow Technique

Abstract Aqueous amines as the solvents for CO 2 removal in low concentration streams have been exhaustively studied. This work focuses on the blending of piperazine (PZ) activator with aqueous tertiary amines (Methyldiethanolamine, MDEA) across concentration range of 200-900 mol/m3 for MDEA and 5-41 mol/m3 for PZ and sterically-hindered amines (2-amino-methyl-1-propanol, AMP) across concentration range of 6-24 mol/m3 for AMP and 7-48 mol/m3 for PZ at temperature range of 298-313 K using stopped-flow technique to determine the direct pseudo first-order reaction kinetics of the blends. The different proposed reaction mechanisms such as base-catalyzed hydration, zwitterion and termolecular reaction mechanisms for the reaction of CO 2 with aqueous solutions of amines were used to calculate the second-order reaction rate constants k 2 , (m3·mol-1s-1). Zwitterion mechanism correlated the stand-alone AMP perfectly while base catalysis mechanism correlated the stand-alone MDEA successfully. Hybrid of zwitterion mechanism correlated the blend of AMP/PZ while a hybrid of zwitterion and base catalysis mechanisms correlated the experimental data of MDEA/PZ system.

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