文章基本信息

标题：Experiment and Optimization for Simultaneous Carbonation of Ca²⁺ and Mg²⁺ in A Two-phase System of Insoluble Diisobutylamine and Aqueous Solution
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作者：Wenlong Wang ; Man Wang ; Xin Liu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep10862
出版社：Springer Nature
摘要：An optimized approach of CO₂ fixation in Ca²⁺/Mg²⁺-rich aqueous solutions using insoluble amine as an enhancing medium was reported. Apparent basicity was verified to be an effective indicator for the selection and optimization of organic amine systems and finally the diisobutylamine + n-octanol system was selected to enhance the carbonation reactions of CO₂ in an artificial Ca²⁺/Mg²⁺-rich solution. In our experiments, when the volume ratio of insoluble organic phase to aqueous one was 2:1 and the reaction temperature was 28 °C, 92% of Ca²⁺ and 80% of Mg²⁺ could be converted to calcium and magnesium carbonate precipitates within 5 min of reaction with the bubbling-in of CO₂. The organic amine system could be regenerated by using carbide slag as the regeneration agent and could still show attractive enhancement performances after 7 rounds of carbonation-regeneration experiments. In this way, the CO₂ capture and sequestration was realized within one single process, with value-added Ca/Mg carbonates being the byproducts. In view of the vast availability of Ca²⁺/Mg²⁺-rich aqueous solutions and the feasible technical coordination with desalination industry, this novel process may have a good application potential in the future.