Determination and correlation of phase equilibrium of ternary system NH4H2PO4-NH4Cl-H2O at different temperatures

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Abstract The solid-liquid equilibrium of the ternary system NH₄H₂PO₄-NH₄Cl-H₂O at 303.15, 323.15, 333.15, 343.15 K was studied by isothermal solution equilibrium method. The equilibrium solid composition was identified by the combination of wet slag method and X-ray diffraction method, and the equilibrium phase diagrams of the ternary system at different temperatures were drawn. The results show that there is a co-saturation point, two univariate curves and three crystallization regions in the phase diagram of the system at various temperatures. The Pitzer-Harvie-Weare model was used to correlate the experimental data. The relative average deviation (RAD) and root mean square deviation (RMSD) between the calculated and experimental values were 3.18 and 0.98, respectively. The experimental results can provide necessary thermodynamic data for the study of co-crystallization of the system.

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	MENG Zeyu
	ZHU Jing
	CHEN Liqiong
	ZHANG Jie
	LI Tianxiang

Keywords： solid-liquid phase equilibrium Pitzer-Harvie-Weare model NH₄H₂PO₄ NH₄Cl

Received 2022-10-28;

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MENG Zeyu, ZHU Jing, CHEN Liqiong, ZHANG Jie, LI Tianxiang.Determination and correlation of phase equilibrium of ternary system NH₄H₂PO₄-NH₄Cl-H₂O at different temperatures[J] Chemcial Industry and Engineering, 2023,V40(1): 127-137

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