Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 49, Issue 2, Pages 174-180Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2005.10.001
Keywords
rotating packed bed; amines; absorption; carbon dioxide; mass transfer coefficient
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The removal efficiency of carbon dioxide from gases containing 10% CO2 by the aqueous solutions containing piperazine (PZ) and its mixture with monoethanollamine (MEA), 2-amino-2-methyl-l-propanol (AMP), and methyldiethanolamine (MDEA) in a rotating packed bed was investigated in this study. The efficiency was assessed in terms of an overall volumetric mass transfer coefficient (K(G)a) that was found to be a strong function of gas and liquid flow rates. The obtained results indicated that PZ was the most effective absorbent over MEA, AMP, and MDEA. This was attributed to a high reaction rate of PZ with CO2. The mixed amines containing PZ and MEA as well as PZ and AMP exhibited a high CO2 removal efficiency as well. A higher portion of PZ in the mixture was more favorable to CO2 absorption. The mixture of PZ with MDEA, however, was found not to be appropriate due to a low reaction activity of MDEA with CO2. The CO, removal efficiency in a rotating packed bed was also observed to be more effective than that in a packed tower, implying a great potential of a rotating packed bed applied to the reduction of the greenhouse gas CO2 from the exhausted gases. (c) 2005 Elsevier B.V. All rights reserved.
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