不同温度下三元体系NH4H2PO4-NH4Cl-H2O的相平衡测定与关联

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摘要采用等温溶解平衡法研究了三元体系NH₄H₂PO₄-NH₄Cl-H₂O在303.15、323.15、333.15和343.15 K下的固液相平衡关系。通过湿渣法与X射线衍射法相结合鉴定了平衡固相组成，绘制了该三元体系在不同温度下的平衡相图。结果表明：该体系在各温度下的相图中都包含1个共饱和点，2条单变量曲线，3个结晶区。采用Pitzer-Harvie-Weare模型对实验数据关联计算，计算值与实验值的平均相对偏差（RAD）和均方根差（RMSD）最大分别为3.18和0.98，实验值与计算值吻合。实验结果可为该体系的共结晶研究提供必要的热力学数据。

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	孟泽宇
	朱静
	陈丽琼
	张杰
	李天祥

关键词：固液相平衡 Pitzer-Harvie-Weare模型 NH₄H₂PO₄ NH₄Cl

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.

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

Received 2022-10-28;

Fund:国家自然科学基金项目（21868010）；贵州省科技计划项目（黔科合平台人才[2018]5781号）。

Corresponding Authors: 李天祥,教授,E-mail:txli@gzu.edu.cn。 Email: txli@gzu.edu.cn

About author: 孟泽宇(1996-),男,硕士研究生,研究方向为材料与化工。

引用本文:

孟泽宇, 朱静, 陈丽琼, 张杰, 李天祥.不同温度下三元体系NH₄H₂PO₄-NH₄Cl-H₂O的相平衡测定与关联[J]. 化学工业与工程, 2023,40(1): 127-137

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, 2023,40(1): 127-137

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