3 years ago

Study of Ion Speciation of CO2 Absorption into Aqueous 1-Dimethylamino-2-propanol Solution Using the NMR Technique

Study of Ion Speciation of CO2 Absorption into Aqueous 1-Dimethylamino-2-propanol Solution Using the NMR Technique
Zhiwu Liang, Paitoon Tontiwachwuthikul, Helei Liu, Raphael Idem
In this work, the speciation (i.e., 1DMA2P molecule as well as 1DMA2PH+, HCO3, and CO32– ions) for the CO2 reactive absorption of CO2 in aqueous 1-dimethylamino-2-propanol solution (i.e., into a 1DMA2P–H2O–CO2 system) was studied using the 13C nulcear magnetic resonance (NMR) technique at a temperature of 301 K over the 1DMA2P concentration range of 0.5–2.0 mol/L and CO2 loading range of 0–1.0 mol CO2/mol amine. Also, in addition to other material conservation laws, a new criterion for selection of the protonation calibration curves, the charge balance of the 1DMA2P–H2O–CO2 system, was added in order to generate results with better accuracy. In addition, the equilibrium constants, K1 and K5, were also obtained using the NMR technique, which had good agreement with those from other works with absolute average deviations of 2.2% and 3.5%, respectively.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01540

DOI: 10.1021/acs.iecr.7b01540

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