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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, Lijiang; Han, Haijun; Dong, Ouyang ; Yao, Yan
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| 第一作者 | Guo, Lijiang |
| 2017-03 | |
| 发表期刊 | JOURNAL OF CHEMICAL THERMODYNAMICS
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| ISSN | 0021-9614 |
| 卷号 | 106页码:285-294 |
| 关键词 | Solid Solution-aqueous Solution Water Activity Solubility Pitzer Model Potassium Chloride Rubidium Chloride |
| 摘要 | 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. |
| DOI | 10.1016/j.jct.2016.12.003 |
| 语种 | 英语 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.isl.ac.cn/handle/363002/6191 |
| 专题 | 青海盐湖研究所知识仓储 盐湖资源与化学实验室 |
| 推荐引用方式 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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