CO2 carbonation of calcium acetate derived from acidolysis of natural CaCO3 for recycling of acetic acid and production of precipitated calcium carbonate

doi:10.3969/j.issn.0438-1157.2014.09.058

CIESC Journal ›› 2014, Vol. 65 ›› Issue (9): 3724-3731.DOI: 10.3969/j.issn.0438-1157.2014.09.058

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CO₂ carbonation of calcium acetate derived from acidolysis of natural CaCO₃ for recycling of acetic acid and production of precipitated calcium carbonate

YANG Zheng^1,2, YUE Hairong^1,2, ZHOU Xiangge³, LIANG Bin^1,2, XIE Heping²

1 School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China;
2 Center of CCUS and CO₂ Mineralization and Utilization, Chengdu 610065, Sichuan, China;
3 School of Chemistry, Sichuan University, Chengdu 610065, Sichuan, China

Received:2013-12-18 Revised:2014-04-14 Online:2014-09-05 Published:2014-09-05
Supported by:
supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2013BAC12B03) and the Key Program of the National Natural Science Foundation of China (21336004).

CO₂碳酸化石灰岩酸解产物回收乙酸及副产沉淀碳酸钙

杨政^1,2, 岳海荣^1,2, 周向葛³, 梁斌^1,2, 谢和平²

1 四川大学化学工程学院, 四川成都 610065;
2 四川大学CCUS与CO₂矿化利用研究中心, 四川成都 610065;
3 四川大学化学学院, 四川成都 610065

通讯作者: 梁斌
基金资助:
国家科技支撑计划项目（2013BAC12B03）；国家自然科学基金重点项目（21336004）；教育部CCUS-CO₂矿化利用科技攻关项目。

Abstract

Abstract: Acetic acid dissolution of limestone for formation of cavity is a kind of environmental approach to fabricating underground storage and preparing precipitated calcium carbonate. This process is an integrated technology consisting of acetic acid dissolution of limestone and CO₂ carbonation of calcium acetate. The kinetics of limestone acidolysis with acetic acid was investigated. Orthogonal experiments were conducted with emphasis on operation conditions (i.e., concentration of calcium acetate, pressure of CO₂, reaction temperature, and reaction time) of the carbonation reaction. The highest conversion of calcium acetate (23.13%) was achieved at the calcium acetate concentration of 0.631 mol·L^-1, CO₂ pressure of 5 MPa, reaction temperature of 80℃ and reaction for 50 min. The product of calcium carbonate was analyzed and could meet the requirements of Chinese national standard.

Key words: limestone, reaction kinetics, calcium acetate, carbon dioxide, optimal design

摘要： 乙酸酸解石灰石造腔是一种建造地下储库同时环保地开采石灰岩制备沉淀碳酸钙的新方法。通过耦合乙酸酸解石灰石及酸解产物乙酸钙CO₂碳酸化的工艺过程，研究了乙酸酸解石灰岩的表面反应动力学和乙酸钙CO₂碳酸化的工艺技术条件。采用正交实验分析法，研究了CO₂碳酸化反应中乙酸钙浓度、反应温度、CO₂压力、反应时间对乙酸钙碳酸化反应制沉淀碳酸钙的影响，并通过正交实验确定了最优化操作条件。实验结果表明，乙酸酸解反应速率主要受乙酸浓度控制。CO₂碳酸化反应在当乙酸钙溶液浓度为0.631 mol·L^-1，CO₂压力为5.0 MPa，温度为80℃，反应时间为50 min时CO₂碳酸化效率达到最高（23.13%），生成的沉淀碳酸钙产品各项指标均符合中国国标优级要求。

关键词: 石灰岩, 反应动力学, 乙酸钙, 二氧化碳, 优化设计

CLC Number:

TQ028.8

YANG Zheng, YUE Hairong, ZHOU Xiangge, LIANG Bin, XIE Heping. CO₂ carbonation of calcium acetate derived from acidolysis of natural CaCO₃ for recycling of acetic acid and production of precipitated calcium carbonate[J]. CIESC Journal, 2014, 65(9): 3724-3731.

杨政, 岳海荣, 周向葛, 梁斌, 谢和平. CO₂碳酸化石灰岩酸解产物回收乙酸及副产沉淀碳酸钙[J]. 化工学报, 2014, 65(9): 3724-3731.

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CO₂ carbonation of calcium acetate derived from acidolysis of natural CaCO₃ for recycling of acetic acid and production of precipitated calcium carbonate

CO₂碳酸化石灰岩酸解产物回收乙酸及副产沉淀碳酸钙

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