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The removal efficiency of carbon dioxide from gases containing 10% CO 2 by the aqueous solutions containing piperazine (PZ) and its mixture with monoethanolamine (MEA), 2-amino-2-methyl-1-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 ...