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Performance evaluation on complex absorbents for CO2 capture
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DOI：10.1016/j.seppur.2011.08.029.png)
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Piperazine (PZ) and phosphates as additives were added into an aqueous N-methylmonoethanolamine (MMEA) to form complex absorbents, respectively. Performances of CO2 capture by the complex absorbents were evaluated in a bubble column reactor. Reaction mechanisms and activations of the additives were presented theoretically. Effects of type and concentration of additives, and gas flowrates on volumetric mass transfer coefficient were investigated, and effects of orifice size of the gas sparger and stirring rates on average absorption velocity were also discussed. Results show that CO2 loadings of MMEA-PZ and MMEA-K3PO4 complex absorbents were larger than that of single MMEA and MEA absorbents. The MMEA-PZ complex absorbent gave a highest CO2 loading in all complex absorbents. The overall mass transfer coefficient increased, subsequently reached a maximum and then decreased with the increase of K3PO4 concentration in the complex absorbent. The overall mass transfer coefficient increased with the increase of the gas flow rates. Average absorption velocities increased with the decrease of the orifice size and with the increase of the orifice numbers. The average absorption velocities in moderate intensity of stirring rates were higher than that in the high intensity of stirring rates. (C) 2011 Elsevier B.V. All rights reserved.
Keyword:
CO2 capture
Methylmonoethanolamine
Phosphate
Piperazine
Bubble column
期刊
IF:
9
论文数:
3.0W
被引数:
12.1W
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暂无机构信息
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