The Regeneration of Ammonia Solution by Calcium Hydroxide for Carbon Dioxide Absorption from the Flue Gas

Authors

  • Hsin Ta Hsueh National Cheng Kung University, Tainan, Taiwan 701,
  • Tsung Wen Chien National Cheng Kung University, Tainan, Taiwan 701,
  • Tzu Hsing Ko Tzu-Hui Institute of Technology, Pingtung 926, Taiwan
  • Teng Te Huang National Cheng Kung University, Tainan, Taiwan 701, China
  • Hsin Chu National Cheng Kung University, Tainan, Taiwan 701, China

DOI:

https://doi.org/10.15377/2410-3624.2015.02.01.3

Keywords:

Carbon dioxide, absorption, regeneration, ammonium solution, calcium hydroxide

Abstract

The tests of this study were conducted by the semi-continuous flow experiments to absorb the carbon dioxide (CO2) gas in a bench-scale spraying column reactor. The absorption capacity and the regeneration efficiency of the absorbed ammonia (NH3) solution were determined. In this study, the maximum regeneration efficiency is 68.4% as the concentration of NH3 solution is 1% and the ratio of calcium hydroxide (Ca(OH)2) and CO2 is 1 as well. Furthermore, the absorption capacity of the NH3 solution decreases from 1.67 to 0.27 kg-CO2/kg-NH3 after regenerating four times due to the 30-38% loss each time. Regarding the regeneration kinetics between absorbed products and Ca(OH)2, the comparative degree of covered Ca(OH)2 during the reaction was recognized after fitting by a surface coverage model. Finally, the ammonium bicarbonate (NH4HCO3) reduced by Ca(OH)2 to calcium carbonate (CaCO3) solid and NH3 solution in the regeneration reactions was observed by scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDS) pictures and X-Ray Diffraction (XRD) analyses. Although the NH3 solution can be regenerated by Ca(OH)2 effectively in this study, the overall benefit of this process should be estimated further in the energy aspect.

Author Biographies

Hsin Ta Hsueh, National Cheng Kung University, Tainan, Taiwan 701,

Department of Environmental Engineering and Sustainable Environment Research Laboratories

Tsung Wen Chien, National Cheng Kung University, Tainan, Taiwan 701,

Department of Environmental Engineering and Sustainable Environment Research Laboratories

Tzu Hsing Ko, Tzu-Hui Institute of Technology, Pingtung 926, Taiwan

Department of Tourism Affairs, and Dean of Academic Affairs

Teng Te Huang, National Cheng Kung University, Tainan, Taiwan 701, China

Department of Environmental Engineering and Sustainable Environment Research Laboratories

Hsin Chu, National Cheng Kung University, Tainan, Taiwan 701, China

Department of Environmental Engineering and Sustainable Environment Research Laboratories

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Published

2015-07-14

How to Cite

1.
Hsin Ta Hsueh, Tsung Wen Chien, Tzu Hsing Ko, Teng Te Huang, Hsin Chu. The Regeneration of Ammonia Solution by Calcium Hydroxide for Carbon Dioxide Absorption from the Flue Gas. Glob. Environ. Eng. [Internet]. 2015Jul.14 [cited 2021Sep.26];2(1):23-8. Available from: https://www.avantipublishers.com/jms/index.php/tgevnie/article/view/330

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