In this research, carbon dioxide is captured and chemically converted to high purity calcium carbonate salt which can be used for various industrial fields. Aqueous indirect inorganic carbonation methods were applied throughout the research and seawater-based industrial wastewater was utilized for metal ion supply. For CO2 capture, representative alkanolamine absorbent solutions in 30 wt% concentration were used, that is, monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA). For high purity metal ion separation, calcium ion contained in the seawater-based industrial waster was separated in the form of gypsum followed by the carbonation reaction to form high purity calcium carbonate salt. Consiering the final products and their economic cost, the cycle using MEA will be proper. However, if MDEA can be used, the amount of carbon dioxide capture capacity per cycle would be great. Also, conceptual continuous cycle which produces calcium carbonate and magnesium carbonate was suggested. This research may help the nations such as European nations or east asian countries like Korea and Japan where no adequate CO2 storages exist and crust activities are in progress, if commercialized.

• Dongwoo Kang(Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Korea)
• Min-Gu Lee(Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Korea)
• Yunsung Yoo(Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Korea)
• Jinwon Park(Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Korea, National Institute of Environmental Research, Incheon, Korea)