Mechanism, kinetic model and hydrogen ion apparent diffusion coefficient in magnesium hydroxide dissolution by pressurized carbonated water
Bo, Jing1,2,3; Zhang, Yifei1,2; Zhang, Yi1,2
2017-12-01
发表期刊REACTION KINETICS MECHANISMS AND CATALYSIS
ISSN1878-5190
卷号122期号:2页码:819-838
摘要

In the process of magnesium hydroxide dissolution by carbonated water with CO2 pressure between 1 and 5 MPa, no solid product was found covering the solid Mg(OH)(2). A reaction mechanism was proposed, where the hydration of Mg2+ was emphasized. The kinetic model for the dissolution was derived, which fitted the experiment data well and could be applicable to other dissolution reactions without solid product but soluble one highly binding with the solvent. A concept of "progressive liquid film" was introduced to this reaction system for the first time. The pressurized magnesium hydroxide dissolution was found to be rate-controlled by the diffusion in the progressive liquid film around the solid Mg(OH)(2). Based on the Arrhenius expression, the apparent activation energy at stirring speed of 200, 300 and 400 rpm was obtained as 17.1, 25.1 and 25.4 kJ/mol, which also indicated that the dissolution inclined to be diffusion rate controlled. Moreover, the apparent diffusion coefficients of H+ in the liquid film were calculated and an empirical expression was obtained for the first time as well.

关键词Mechanism Kinetic Model Dissolution Of Mg(Oh)(2) Co2 Progressive Liquid Film H++ Apparent Diffusion Coefficient
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1007/s11144-017-1230-y
收录类别SCI
语种英语
关键词[WOS]AQUEOUS-SOLUTION ; MASS-TRANSFER ; SYSTEM ; HYDRATION ; OXIDE ; CO2 ; SEQUESTRATION ; MGO ; HYDROMAGNESITE ; PRECIPITATION
WOS研究方向Chemistry
WOS类目Chemistry, Physical
项目资助者National Natural Science Foundation of China(21276258) ; National 863 Project of China(2011AA060701)
WOS记录号WOS:000413845800011
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23401
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydrometallurg Cleaner Prod Technol, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Bo, Jing,Zhang, Yifei,Zhang, Yi. Mechanism, kinetic model and hydrogen ion apparent diffusion coefficient in magnesium hydroxide dissolution by pressurized carbonated water[J]. REACTION KINETICS MECHANISMS AND CATALYSIS,2017,122(2):819-838.
APA Bo, Jing,Zhang, Yifei,&Zhang, Yi.(2017).Mechanism, kinetic model and hydrogen ion apparent diffusion coefficient in magnesium hydroxide dissolution by pressurized carbonated water.REACTION KINETICS MECHANISMS AND CATALYSIS,122(2),819-838.
MLA Bo, Jing,et al."Mechanism, kinetic model and hydrogen ion apparent diffusion coefficient in magnesium hydroxide dissolution by pressurized carbonated water".REACTION KINETICS MECHANISMS AND CATALYSIS 122.2(2017):819-838.
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