Chemical conversion of carbon dioxide via target metal separation using seawater‐derived wastewater

Abstract

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. Xray 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.

Formation and Transformation Trends of Metal Carbonates With Cation Ratio and Ion Interaction in Post-treatment Process of Desalination Brine

“…[Mg 2+ ]/[Ca 2+ ], M, is a molar ratio-based index that represents the cation molar composition of metal carbonate or simulated desalination brine. According to previous studies, the [Mg 2+ ]/[Ca 2+ ] ratio affects the formation of metal carbonates [22,[24][25][26]. In a multi-cation system, the ratio of the mother solution determines which metal carbonate is formed.…”

“…According to previous studies, aragonite is formed in Ca 2+ -and Mg 2+ -rich solutions, such as seawater [25,[47][48][49] and in vitro owing to biomineralization [50]. Because the formation conditions for aragonite are similar to those of monohydrocalcite, previous studies could not establish specific differences between the conditions [51,52].…”

Experimental and integrated computational study on CCUS technology utilizing desalinated brine.

“…2 Yoo et al conducted further studies on the polymorph control of precipitated crystallites for the application of precipitated mineral carbonates. 2,3 Numerous studies by Song et al, Lee et al, Park et al, etc., have sought to improve the CO2 absorption rate and absorption efficiency. [4][5][6] This study builds upon our previous studies on the mineralization of seawater, and a techno-economic assessment was performed using a computationally integrated method based on an experimentally obtained dataset.…”

“…Kang et al developed an aqueous approach for carbon fixation, and consecutive studies have achieved mineral carbonation using wastewater. 2 Yoo et al conducted further studies on the polymorph control of precipitated crystallites for the application of precipitated mineral carbonates. 2,3 Numerous studies by Song et al, Lee et al, Park et al, etc., have sought to improve the CO2 absorption rate and absorption efficiency.…”

One‐Pot Synthesis of Organic Carbonate from Alcohol and Alkyl Bromide under Low CO2 Pressure

“…The effective use of CO 2 for the benefit of mankind has always been one of the focuses of scientists since CO 2 is a non‐toxic, naturally ample, nonflammable, and economical C1 chemical source [2] . Among them, the capture of CO 2 , [3] activation and conversion of CO 2 [4–6] are the most attractive. Various CO 2 fixation processes have been performed with a number of reactive substrates, including organometallic reagents, alcohols, amines, alkynes, and alkenes, providing valuable chemicals such as urea, formic acid, methanol, carboxylic acids, lactones, carbamates, and organic carbonates [7–11] .…”