Removal of Carbon Dioxide from Ambient Air by Mixed Aqueous Alkanolamines Solution in a Cross-flow Rotating Packed Bed

• Main Authors: Chia Hao Tu, 涂嘉壕
• Other Authors: C. C. Lin
• Format: Others
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/40832846213658836405

碩士 === 長庚大學 === 化工與材料工程學系 === 99 === The carbon dioxide contents in the air have increased continuously since the industrial revolution, causing global warming to be more and more severe. Zinc-air battery resource is abundant and inexpensive, and its theoretical energy is much higher than other metal batteries. However, CO2 generating potassium carbonate on the air electrode is a drawback, which further affects the function of zinc-air batteries. Using a Cross-flow rotating packed bed and applying ethanolamine liquid as absorbent, this study compares whether the outlet concentration is lower than 20ppm under room temperature with different operation conditions (air flow, liquid flow, rotating speed of packed bed, axial height of packed object). This study is suitable for the development of zinc-air batteries. The results of experiments reveal that with the increases in rotating speed, liquid flow and height of packed object, the removal rate of carbon dioxide also increases, but a rise in air flow lowers the removal rate. The experiment results also indicate 0.35M PZ/0.15M MEA>0.1M PZ/0.4M MEA>0.5M MEA, in which raising the PZ ratio in the absorbent can significantly increase the removal rate, and raising it to 0.5M PZ/0.5M MEA can allow the carbon dioxide removal rate to be as high as 100%. We can confirm that Cross-flow rotating packed bed fits the requirements of capturing carbon dioxide at the inlets of zinc-air batteries.