Research Information System
Chemical Engineering Science, vol.325, 2026 (SCI-Expanded, Scopus)
In this study, a novel mixed amine biphasic absorbent composed of DETA, 1DMA2P, and H2O was constructed for CO2 capture. Physical properties of the biphasic absorbent were calculated over the temperature range of 298.15 K to 313.15 K, while its CO2 absorption kinetics were investigated in a stirred tank reactor. Based on different reaction mechanisms of the primary amine DETA and the tertiary amine 1DMA2P with CO2, the overall reaction rate constant (kov) and the second-order reaction rate constant (k2) of the biphasic solvent were calculated. Using Arrhenius equation, the activation energies of DETA and 1DMA2P solutions in the biphasic absorbent were calculated to be 19.37 kJ/mol and 51.45 kJ/mol, respectively, both lower than those of pure solutions. 13C NMR data and quantum chemical calculations indicate the generation of highly polar products with increasing CO2 flow rate, prompting the phase transition in homogeneous solution. DETA and its products dissolved in aqueous phase form the CO2-rich phase. The less polar 1DMA2P interacted less strongly with DETA products and separated into upper layer of the solution due to its lower density than the DETA-related products.