Solid鈥揕iquid Phase Equilibrium for the Ternary System (Potassium Chloride + Potassium Dihydrogen Phosphate + Water) at (298.15 and 313.15) K

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• 作者：Wei Shen ; Yongsheng Ren ; Xiaorui Zhang ; Yuqin Shi
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：July 9, 2015
• 年：2015
• 卷：60
• 期：7
• 页码：2070-2078
• 全文大小：402K
• ISSN：1520-5134

文摘

Solid鈥搇iquid phase equilibrium and physicochemical properties (pH, n_D, 蟻) for the ternary system KCl + KH₂PO₄ + H₂O at (298.15 and 313.15) K were investigated by the method of isothermal solution saturation and Schreinemaker鈥檚 wet residue. On the basis of the experimental data, corresponding phase diagrams and diagrams of physicochemical properties vs composition were plotted. In the phase diagrams, there are one eutonic point, two uninvariant curves, and two crystallization regions corresponding to KCl, KH₂PO₄. The phase diagrams of the ternary system show similar tendencies at different temperatures. At each temperature, the crystallization region of KH₂PO₄ is larger than that of KCl, and the crystallization region of KH₂PO₄ becomes larger as the temperature increases. Physico-chemical properties of the solid鈥搇iquid phase equilibrium solution vary regularly with the composition of KH₂PO₄ concentration. The experimental data have been satisfactorily compared with literature data. The measured data and phase equilibrium diagrams for the ternary system can provide the fundamental basis for the industrial production of KH₂PO₄ by the method of extraction with industrial KCl and industrial H₃PO₄ aqueous mixtures.