Determination and correlation for solid-liquid phase equilibrium of ternary KCl-NH4Cl-H2O and KH2PO4-NH4H2PO4-H2O systems at 283.15 K

  • Jiamin Yang ,
  • Jing Zhu ,
  • Xue Hu ,
  • Qiang Wu ,
  • Tianxiang Li
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  • School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China

Received date: 2020-07-11

  Online published: 2021-01-08

Abstract

The solubility of ternary systems KCl-NH4Cl-H2O and KH2PO4-NH4H2PO4-H2O were determined by isothermal dissolution equilibrium method at 283.15 K.The structure and composition of the equilibrium solid phase were determined by the combination of X-ray diffraction and Schreinemakers′ wet residue method.Results showed that the equilibrium solid pha-se of two systems had solid solutions of partially miscible,which respectively contained one co-saturation crystallization point,two univariate curves and six zones.The solubility data of the two systems were correlated and calculated by Pitzer model.Results showed that the maximum relative error and the minimum relative error of calculated data of KCl-NH4Cl-H2O ternary system were 3.096 9% and 0.038 3% resepectively,and the maximum relative error and the minimum relative error of calculated data of KH2PO4-NH4H2PO4-H2O ternary system were 5.935 6% and 0.069 8% resepectively.The calculated value of Pitzer model was basically consistent with the experimental value.

Cite this article

Jiamin Yang , Jing Zhu , Xue Hu , Qiang Wu , Tianxiang Li . Determination and correlation for solid-liquid phase equilibrium of ternary KCl-NH4Cl-H2O and KH2PO4-NH4H2PO4-H2O systems at 283.15 K[J]. Inorganic Chemicals Industry, 2021 , 53(1) : 30 -35 . DOI: 10.11962/1006-4990.2020-0103

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