Wenchao Zheng, Wusan Jiang, Rui Zhang
Jan 16, 2020
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Influential Citations
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Journal
Energy & Fuels
Abstract
The equilibrium solubility and kinetics of N1, N2-dimethylethane-1,2-diamine (DMEDA), a new and potential diamine absorbent for CO2 capture, have been investigated in this work. The equilibrium solubility of 2M DMEDA solution was measured at 298.15-333.15 K and with CO2 partial pressures of 5-100 kPa. The heat (-56.47 kJ/mol) of CO2 absorption was obtained by the Clausius-Clapeyron equation. In addition, the NMR analysis further confirmed the formation of dicarbamate and that the reaction rate contribution by dicarbamate can be ignored, and showed the CO2 absorption in the liquid phase can be divided into 3 regions as the CO2 loadings increased. The pseudo-first-order rate constant (k0) of CO2 absorption into aqueous DMEDA solution was then investigated at different amine concentrations (0.025-0.075 mol/L) and temperatures (293.15-313.15 K) with the stopped-flow technology. The results show that the k0 value in the DMEDA solution increases with the increase of temperature and amine concentration. The pseu...