Tertiary amine blend for CO2 capture: A kinetic investigation using Monoethanolamine, Triethanolamine and Piperazine

The kinetics reaction of the tertiary amine blend of monoethanolamine (MEA), triethanolamine (TEA), and piperazine (PZ) with carbon dioxide (CO2) considered in a packed bed. The mechanism of reaction and kinetics of this tertiary amine were studied at (298-308) K and 1atm with total blend concentration varied from (4-6) molars. The current experiments revealed a new good absorbent of (MEA, TEA, PZ ) blend to capture CO2, due to it is potential upon CO2. Therefore, the proposed mechanism found to be suitable in determining the kinetics of the involved reactions. The reaction mechanism was defined using a mechanism of zwitterion and termolecular. It's found that the absorption follows the fast kinetic reaction with first-order kinetics for CO2 and second-order for the blend concentration. The rate constant value k2 (m3/kmol.s) of the tertiary blend of (MEA, TEA, PZ )found to be (8050) that is greater than that of commonly used amine MEA(7500). Also, the activation energy was calculated and found to be 24 kJ/mol.