Absorption of carbon dioxide with piperazine and its mixtures in a rotating packed bed

• Published in: Separation and purification technology 2006-04, Vol.49 (2), p.174-180
• Main Authors: Tan, Chung-Sung, Chen, Jung-En
• Format: Article
• Language: English
• Subjects: Absorption; Absorption, stripping; Amines; Applied sciences; Carbon dioxide; Chemical engineering; Exact sciences and technology; Heat and mass transfer. Packings, plates; Mass transfer coefficient; Rotating packed bed
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2005.10.001

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 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 CO 2. The mixed amines containing PZ and MEA as well as PZ and AMP exhibited a high CO 2 removal efficiency as well. A higher portion of PZ in the mixture was more favorable to CO 2 absorption. The mixture of PZ with MDEA, however, was found not to be appropriate due to a low reaction activity of MDEA with CO 2. The CO 2 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 CO 2 from the exhausted gases.