强化碳酸化固定CO_2反应过程分析与机理探讨
Process analysis and mechanism discussion of enhanced CO_2 sequestration by mineral carbonation
查看参考文献18篇
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文摘
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引言
我国是温室气体CO_2排放大国,以煤炭为主的能源结构决定了煤电、钢铁、水泥、化工等高耗能的过程工业是我国CO_2排放的主体.目前,发达国家主要以CO_2的捕获与地质埋存作为CO_2减排技术发展的重点,但碳捕集的高成本和地质埋存的高生态环境风险是阻碍其大规模应用的瓶颈[1]. |
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其他语种文摘
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Indirect CO_2 mineral sequestration that involves two separate steps, with acetic acid as the recycling medium, was limited by a crystallization conversion of only 20% in the second gas-liquid reactive crystallization step.In this paper, the second carbonation step was greatly improved by coupling reactive crystallization and solvent extraction with the introduction of an organic solvent, tributyl phosphate (TBP), to the process.The effect of the initial concentration of calcium acetate in the aqueous solution on the crystallization conversion was studied experimentally.The obtained calcium conversion was above 40%, which was one time higher than that reported in the literature.Based on the mechanism discussion and thermodynamic equilibrium calculation analysis, it can be concluded that adding TBP to the step can consume the produced acetic acid, and it is in favor of the precipitation of calcium carbonate.While the challenge presented by the strong interaction between calcium ions and acetate ions for further improving crystallization conversion cannot be solved only by the addition of TBP. |
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来源
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化工学报
,2009,60(9):2332-2338 【核心库】
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关键词
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二氧化碳
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矿物碳酸化
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反应结晶
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过程强化
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地址
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中国科学院过程工程研究所, 中国科学院湿法冶金清洁生产技术国家工程实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0438-1157 |
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学科
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化学工业 |
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基金
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国家“十一五”科技支撑计划项目
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国家973计划
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文献收藏号
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CSCD:3663717
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