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Solubility of KH2PO4 in KCl, H3PO4, and Their Mixture Solutions

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State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R. China
*E-mail: [email protected]. Tel.: +86-10-62783870.
Cite this: J. Chem. Eng. Data 2014, 59, 2, 439–443
Publication Date (Web):January 29, 2014
https://doi.org/10.1021/je400911m
Copyright © 2014 American Chemical Society

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    Abstract

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    The solubility data of KH2PO4 in the mixed solution of KCl and H3PO4 is basically required for designing and optimizing the preparation process of KH2PO4 from KCl and H3PO4 using solvent extraction. In this study, the solubility of KH2PO4 in KCl, H3PO4, and their mixture solutions has been measured respectively at temperatures of (288.2, 298.2 and 308.2) K. In KCl solutions, the solubility of KH2PO4 decreases as the concentration of KCl increases before KCl begins to precipitate. In H3PO4 solutions, the solubility of KH2PO4 increases as the concentration of H3PO4 increases. In mixed solutions of approximately equimolar KCl and H3PO4, the solubility of KH2PO4 decreases a little first and then increases remarkably with the increase of KCl (H3PO4) concentration. In the three systems studied, the solubility of KH2PO4 always increases with increasing temperature.

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    Cited By

    This article is cited by 18 publications.

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    3. Sheng-qiang Lin, Jian-hua Tang, Jian Teng, and Debiao Liu . Phase equilibrium in the System KH2PO4 + KCl + H3PO4 at 298.15 K and 308.15 K. Journal of Chemical & Engineering Data 2017, 62 (12) , 4169-4173. https://doi.org/10.1021/acs.jced.7b00554
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    11. Tao Zhang, Yaling Yang, Li Lv, Xinlong Wang, Benhe Zhong, Shengwei Tang. Preparation of potassium dihydrogen phosphate with N-methyldiethanolamine as extractant. Chemical Engineering and Processing - Process Intensification 2018, 129 , 10-16. https://doi.org/10.1016/j.cep.2018.04.033
    12. Yaling Yang, Tao Zhang, Xinlong Wang, Shengwei Tang. An investigation on the solid–liquid phase equilibrium of the quaternary system KH 2 PO 4 –H 3 PO 4 –CH 2 OHCH 2 OH–H 2 O. Fluid Phase Equilibria 2018, 464 , 12-21. https://doi.org/10.1016/j.fluid.2018.02.014
    13. Yongsheng Ren, Jiamin Liu, Jingjing Ma, Chao Cai. KH 2 PO 4 Production by Cooling Crystallization Using Its Phase Equilibrium in the KH 2 PO 4 ‐KCl‐C 2 H 5 OH‐H 2 O System. Chemical Engineering & Technology 2017, 40 (7) , 1332-1338. https://doi.org/10.1002/ceat.201600653
    14. Yongsheng Ren, Jiamin Liu, Chao Cai. Determination of related systems' solubility data (I) in the preparation process of K 2 SO 4 or KH 2 PO 4 by the solvent extraction method. Fluid Phase Equilibria 2017, 444 , 21-30. https://doi.org/10.1016/j.fluid.2017.04.010
    15. Wei Shen, Yongsheng Ren, Jiajin Sun. Solid-liquid phase equilibrium and phase diagram for the reciprocal quaternary system Na+, K+//SO42,H2PO4− - H2O at 313.15 K. Fluid Phase Equilibria 2016, 429 , 196-204. https://doi.org/10.1016/j.fluid.2016.09.005
    16. Wei Shen, Yongsheng Ren, Ting Wang, Cui Hai. Stable (solid+liquid) phase equilibrium for the ternary systems (K2SO4+KH2PO4+H2O), (K2SO4+KCl+H2O) at T=313.15K. The Journal of Chemical Thermodynamics 2015, 90 , 15-23. https://doi.org/10.1016/j.jct.2015.06.011
    17. Xiaorui Zhang, Chengqi Liu, Wei Shen, Yongsheng Ren, Danyang Li, Huiling Yang. Solubility and physic-chemical properties of NaH2PO4 in phosphoric acid, sodium chloride and their mixture solutions at T=(298.15 and 313.15)K. The Journal of Chemical Thermodynamics 2015, 90 , 185-192. https://doi.org/10.1016/j.jct.2015.06.038
    18. Wei Shen, Yilan Wang, Tingting He, Xiaorui Zhang, Haipeng Zhao, Yongsheng Ren. Study on the phase equilibrium of the quaternary systems Na+ (K+)//H2PO4−, Cl−, SO42−–H2O at 313.15 K. Fluid Phase Equilibria 2015, 403 , 85-94. https://doi.org/10.1016/j.fluid.2015.06.014

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