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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
Source PublicationREACTION KINETICS MECHANISMS AND CATALYSIS
ISSN1878-5190
Volume122Issue:2Pages:819-838
Abstract

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.

KeywordMechanism Kinetic Model Dissolution Of Mg(Oh)(2) Co2 Progressive Liquid Film H++ Apparent Diffusion Coefficient
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11144-017-1230-y
Indexed BySCI
Language英语
WOS KeywordAQUEOUS-SOLUTION ; MASS-TRANSFER ; SYSTEM ; HYDRATION ; OXIDE ; CO2 ; SEQUESTRATION ; MGO ; HYDROMAGNESITE ; PRECIPITATION
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
Funding OrganizationNational Natural Science Foundation of China(21276258) ; National 863 Project of China(2011AA060701)
WOS IDWOS:000413845800011
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23401
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.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
Recommended Citation
GB/T 7714
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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