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Thermodynamics and phase equilibrium of the high concentration solid solution-aqueous solution system KCl-RbCl-H2O from T=298.15 K to T=323.15 K
Guo, Lijiang1,2; Han, Haijun1; Dong, Ouyang1; Yao, Yan1
2017-03-01
Source PublicationJOURNAL OF CHEMICAL THERMODYNAMICS
ISSN0021-9614
Volume106Pages:285-294
Abstract

Water activities of the high concentration solid solution-aqueous solution system (SS-AS) KCl-RbCIl-H2O and its sub-binary systems at T= 298.15 K and T=323.15 K have been elaborately measured by an isopiestic method. The solubility of this ternary system at T= (298.15, 308.15 and 323.15) K was also measured by a Flow-Cloud-Point method. A Pitzer model was used to estimate the reliability of the solubility reported in the literature, and to judge the type of solid phase, by correlating the measured water activity and the reported solubility values. The binary model parameters as a function of temperature between T=298.15 K and T=323.15 K were obtained by fitting the water activities in the binary systems. The predicted water activities at T=298.15 K and T= 323.15 K with the obtained binary parameters only, are in good agreement with the experimental values, which indicate that the Pitzer model can reliably represent the properties of the ternary system, with binary parameters only within the temperature range from T=298.15 K to T=323.15 K. Under the different assumptions that the equilibrium solid phase involved the pure salts (KCl(s) and RbCl(s) for the ideal solid solution or regular solid solution (K, Rb)Cl-(ss), the solubility isotherms at T= (298.15, 308.15 and 323.15) K were calculated and compared to experimental results, respectively. It was found that only the calculated solubility isotherms for (K, Rb)Cl-(ss) regular solid solution are consistent with the corresponding experimental values. The solid phase equilibrated with the aqueous solution in the KCI-RbCl-H2O ternary system should be a regular solid solution (K, Rb)Cl-(ss). This conclusion also can be verified from the Lippman log Sigma K-X-s - X-act and Phi Sigma(m) - X-s - X-aq equilibrium diagrams. (C) 2016 Elsevier Ltd.

KeywordSolid Solution-aqueous Solution Water Activity Solubility Pitzer Model Potassium Chloride Rubidium Chloride
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.jct.2016.12.003
Indexed BySCI
Language英语
WOS KeywordAlkali-halide Systems ; Ternary-systems ; Mineral Solubilities ; Liquid Equilibrium ; Double Salts ; Water ; 25-degrees-c ; Rubidium ; Rb ; Na
WOS Research AreaThermodynamics ; Chemistry
WOS SubjectThermodynamics ; Chemistry, Physical
Funding OrganizationNational Natural Science Foundation of China(21303239 ; Nature Science Foundation of Qinghai(2013-Z-927Q) ; 21406253)
WOS IDWOS:000392352900031
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21902
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
2.Chinese Acad Sci, Natl Engn Lab Hydrometallurg Cleaner Prod Technol, Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Guo, Lijiang,Han, Haijun,Dong, Ouyang,et al. Thermodynamics and phase equilibrium of the high concentration solid solution-aqueous solution system KCl-RbCl-H2O from T=298.15 K to T=323.15 K[J]. JOURNAL OF CHEMICAL THERMODYNAMICS,2017,106:285-294.
APA Guo, Lijiang,Han, Haijun,Dong, Ouyang,&Yao, Yan.(2017).Thermodynamics and phase equilibrium of the high concentration solid solution-aqueous solution system KCl-RbCl-H2O from T=298.15 K to T=323.15 K.JOURNAL OF CHEMICAL THERMODYNAMICS,106,285-294.
MLA Guo, Lijiang,et al."Thermodynamics and phase equilibrium of the high concentration solid solution-aqueous solution system KCl-RbCl-H2O from T=298.15 K to T=323.15 K".JOURNAL OF CHEMICAL THERMODYNAMICS 106(2017):285-294.
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