Barium carbonate precipitation as a method to fix and utilize carbon dioxide

Characteristics of Carbonate Formation from Concentrated Seawater Using CO2 Chemical Absorption Methodology

“…A higher-concentration MEA solution required a longer reaction time than a lower-concentration one. This means that the operation time could be reduced by using a lower-concentration MEA solution [ 4 , 6 , 16 ]. As mentioned above, we used absorption and desorption in experiments twice under identical conditions.…”

“…To recover the metal carbonate, concentrated seawater was used ( Table 1 ), because it matched the total CO 2 -loading values and the metal ion rate. In a previous study, Park et al [ 16 , 24 ] reported that most of the converted CO 2 could form metal carbonates when the concentration of metal ions was adequate for the reaction. Thereafter, the CO 2 -saturated solution (amine in this study) was mixed with concentrated seawater.…”

“…The authors used simulated metal solutions with a metal ion concentration of 20 wt % with balanced water. That is, the concentration of the supplied metal ion was higher than the amount of absorbed CO 2 because the concentration of the latter was approximately 0.2–0.5 mol in the amine solution [ 4 , 9 , 16 , 19 ]. Therefore, most of the absorbed CO 2 in the amine solution was converted into metal carbonate.…”

“…Thereafter, aqueous CO 2 reacts with the metal ions present in the solution. In nature, this process is referred to as weathering and it is a slow reaction [ 16 ]. Through this process, the CO 2 in the atmosphere is stored semi-permanently in solid materials.…”

“…To improve the conversion rate of CO 2 , monoethanolamine (MEA), di-ethanolamine (DEA), and methyl-diethanolamine (MDEA) were selected. In our previous studies, amine solutions facilitated an increase in the rate of CO 2 conversion [ 4 , 5 , 6 , 16 ]. Various amine solutions such as MEA, di-ethanolamine (DEA), and methyl-di-ethanolamine (MDEA) have been used before [ 4 , 9 , 16 ].…”