In this work, the stopped-flow technique is used to determine the kinetics data in terms of pseudo first-order rate constants ( k 0 ) for the homogenous reaction of CO 2 into aqueous solutions of 3-dimethylaminopropylamine (DMAPA) and 3-diethylaminopropylamine (DEAPA) as amine concentrations ranged from 0.05 kmol/m 3 to 0.15 kmol/m 3 and temperature ranged from 293 K to 313 K. It is found that k 0 increased with increasing temperature and with increasing amine concentration. The mechanism of the pseudo first-order chemical reaction hypothesis is applied to interpret the experimental data. The Arrhenius expressions as k 2 = 8.69 × 10 9 × exp ( − 4226.2 / T ) for DMAPA and k 2 = 7.21 × 10 12 × exp ( − 6162.9 / T ) for DEAPA are obtained. The results show that the experimental CO 2 absorption rates exhibited good agreement with predicted CO 2 absorption rates with an average relative deviation (ARD) of 2.34% and 7.53%, respectively. Finally, the interaction of tertiary amine groups with primary amine groups and the effect of molecular structure on the interaction are discussed by comparing the CO 2 absorption and desorption performances in five different systems (MEA, DEEA, MEA + DEEA, DMAPA, DEAPA). It is found that the intermolecular interaction of amino groups is stronger than that of intramolecular interaction.
In this study, four DETA-SiO2 solid amine adsorbents were prepared by an impregnation method using diethylenetriamine (DETA) as the amine source and four types of silica with different pore structures as the carrier, and the effects of varying amine concentrations, temperatures and pressures on the CO2 adsorption performance were investigated. The results showed that the prepared N-MCM-48-C material reached a maximum CO2 adsorption of 417.45mgg−1 at 25°C and 0.5MPa. The effect of pressure on the adsorption performance was verified by kinetic calculations using the intraparticle diffusion model and the Thomas dynamic adsorption model. The presence of surfactant (CTAB) inside the carrier diluted the amine concentration, which improved the homogenisation of the amine on the carrier and increased the CO2 mass transfer efficiency and adsorption capacity. Multiple pressure swing adsorption (PSA) experiments have shown that N-MCM-48-C material has stable adsorption performance during the PSA process and the adsorption capacity can reach 300mgg−1.
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