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Chemical conversion of carbon dioxide via target metal separation using seawater‐derived wastewater
Author(s) -
Kang Dongwoo,
Yoo Yunsung,
Park Jinwon,
Lee MinGu
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702960
Subject(s) - carbonation , diethanolamine , alkanolamine , vaterite , chemistry , carbon dioxide , industrial wastewater treatment , calcium carbonate , thermogravimetric analysis , inorganic chemistry , aqueous solution , aragonite , wastewater , nuclear chemistry , waste management , organic chemistry , engineering
This study investigated the capture of carbon dioxide (CO 2 ) and its chemical conversion to high‐purity calcium carbonate salt, which has potential uses in a range of industrial sectors. Indirect inorganic aqueous carbonation methods were used, with seawater‐based industrial wastewater as the source of metal ions. The alkanolamine absorbent solutions of monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA) were used at typical industrial concentrations of 30 wt%. Calcium ions from industrial wastewater were extracted in the form of gypsum. Subsequently, a carbonation reaction afforded high‐purity calcium carbonate salt. The conversion yields of 33.16% for monoethanolamine, 33.86% for diethanolamine, and 55.18% for methyldiethanolamine were achieved. Thermogravimetric analysis demonstrated the purity of the product to be 93.6, 95.2 and 92.8 wt%, respectively. X‐ray diffraction and scanning electron microscopy showed the crystal structure of the products to be aragonite mixed with vaterite. Furthermore, the CO 2 capture capacity of each absorbent and the amount of CO 2 desorbed by the carbonation reaction were investigated. The results may support the design of carbon capture and utilization plants and potential market research.