Kinetics of CO₂Absorption in an EAE-1DMA2P Blended System Determined in a Stirred Cell Reactor

Kinetic parameters are critical to design reactors and system processes. In this study, the total reaction rate constant, k_ovof an EAE-1DMA2P system at various molar ratios (0.5/2.5, 1/2, 1.5/1.5, 2/1, and 2.5/0.5) was obtained by using a stirred cell reactor at 298–313 K. The second-order reaction rate constant k₂of EAE and 1DMA2P was obtained by building a complex numerical model, and the Arrhenius equation was used to fit k₂. The calculated k₂is in good agreement with the experimental k₂obtained, and the AARD of k_2,EAEand k_2,1DMA2Pare 1.02 and 2.46%, respectively. The activation energies of EAE and 1DMA2P are 28.38 and 55.33 kJ/mol, respectively. The physical solubility of N₂O in the EAE-1DMA2P system was measured in a stirred cell reactor. The physical solubility of CO₂in the EAE-1DMA2P system was obtained by “N₂O analogy method”. The CO₂diffusion coefficient (D_CO2,) in the EAE-1DMA2P blended solvent was calculated. It is proven that the kinetic model has a good ability to predict the dynamic data of an EAE-1DMA2P system. The rate constant k₂and activation energy E_awere analyzed and compared with different amine systems, and the examined blended solvents exhibited faster reaction kinetics and lower reaction activation energy. The complex blended amine system has excellent kinetics and industrial application prospects.