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Vol. 27 No. 2 (2015): Vol 27 Issue 2

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Predictive Phase Equilibria for Aqueous Quaternary System Containing Sodium, Potassium, Chloride and Sulfate Ions from 273.15 to 473.15 K

https://doi.org/10.14233/ajchem.2015.17070
Yuanhui Liu
Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, P.R. China
Yafei Guo
Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, P.R. China
Shiqiang Wang
Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, P.R. China
Xuekui Wang
Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, P.R. China
Tianlong Deng
Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, P.R. China

Corresponding Author(s) : Tianlong Deng

tldeng@tust.edu.cn

Asian Journal of Chemistry, Vol. 27 No. 2 (2015): Vol 27 Issue 2

Abstract

Pitzer ion-interaction model is widely used to calculate the solubilities of salt-water systems. In paper, the solubilities of the aqueous reciprocal quaternary system (Na+, K+//Cl-, SO42- - H2O) from 273.15 to 473.15 K were calculated using the extended chemical equilibrium Harvie-Weare model (HW model) and high temperature chemical model. The dry-salt phase diagrams were plotted based on the Jänecke indexes. In the temperature range from 273.15 to 473.15 K, the mineral crystallization regions in the phase diagrams of the quaternary system change regularly with the changing of temperature. The calculated phase diagrams agree well with the experimental phase diagrams totally from 273.15 to 473.15 K except for the phase region of double salt glasserite (Na2SO4·3K2SO4) at 273.15 K.

Keywords

Chemical model Pitzer parameters Solubility prediction
Liu, Y., Guo, Y., Wang, S., Wang, X., & Deng, T. (2015). Predictive Phase Equilibria for Aqueous Quaternary System Containing Sodium, Potassium, Chloride and Sulfate Ions from 273.15 to 473.15 K. Asian Journal of Chemistry, 27(2), 591–596. https://doi.org/10.14233/ajchem.2015.17070
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