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Phase equilibrium of KH2PO4-KCl-H2O and NH4H2PO4-NH4Cl-H2O ternary system at 283.15 K
Received date: 2020-05-16
Online published: 2020-12-01
The phase equilibrium of KH2PO4-KCl-H2O and NH4H2PO4-NH4Cl-H2O at 283.15 K was determined by using isothermal dissolution equilibrium method.The composition and structure of equilibrium solid phase were identified by analy-sis of wet slag and X-ray diffraction.Results showed that the ternary systems KH2PO4-KCl-H2O and NH4H2PO4-NH4Cl-H2O were simple cosaturated,and no solid solution or adduct was formed.Each phase diagram contained one invariant point,two univariate curves and three crystallization regions.The saturated solubility data of simple ternary systems KH2PO4-KCl-H2O and NH4H2PO4-NH4Cl-H2O were calculated by Pitzer electrolyte solution theory.Results showed that the relative average deviation and the root mean square error of KH2PO4-KCl-H2O system were 0.046 and 0.29 respectively,and the relative average deviation and the root mean square error of NH4H2PO4-NH4Cl-H2O system were 0.044 and 0.31 respectively.The calculated value agreed with the experimental value well.
Key words： ternary system; phase equilibrium; solubility; Pitzer model
Qiang Wu , Xue Hu , Jing Zhu , Jiamin Yang , Tianxiang Li . Phase equilibrium of KH2PO4-KCl-H2O and NH4H2PO4-NH4Cl-H2O ternary system at 283.15 K[J]. Inorganic Chemicals Industry, 2020 , 52(11) : 24 -28 . DOI: 10.11962/1006-4990.2019-0639
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