Solid-liquid phase equilibrium for the system ammonium polyphosphate-urea ammonium nitrate-potassium chloride-water at 273.2 K

doi:10.1016/j.cjche.2023.04.008

Abstract

Abstract: Based on the dynamic method, a quaternary system of ammonium polyphosphate (APP)-urea ammonium nitrate (UAN, CO(NH₂)₂-NH₄NO₃)-potassium chloride (KCl)-H₂O and its subsystems (APP-[CO(NH₂)₂-NH₄NO₃]-H₂O, KCl-[CO(NH₂)₂-NH₄NO₃]-H₂O and APP-KCl-H₂O) were systematically investigated at the temperature of 273.2 K. Each ternary phase diagram contains one invariant point and three crystallization regions. The crystallization regions are: (1) (NH₄)₃HP₂O₇, (NH₄)₄P₂O₇ and ((NH₄)₃HP₂O₇ + (NH₄)₄P₂O₇) for APP-[CO(NH₂)₂-NH₄NO₃]-H₂O diagram; (2) KCl, KNO₃ and (KCl + KNO₃) for KCl-[CO(NH₂)₂-NH₄NO₃]-H₂O diagram and (3) (NH₄)₃HP₂O₇, KCl and ((NH₄)₃HP₂O₇ + KCl) for APP-KCl-H₂O diagram. The quaternary phase diagram of APP-[CO(NH₂)₂-NH₄NO₃]-KCl-H₂O has no quaternary invariant point but includes four solid phase crystallization regions, i.e., (NH₄)₃HP₂O₇, (NH₄)₄P₂O₇, KNO₃ and KCl, in which the KNO₃ region occupies the largest area. The maximum total nutrient content (N + P₂O₅ + K₂O) existing as ionic forms in the APP-[CO(NH₂)₂-NH₄NO₃]-H₂O, KCl-[CO(NH₂)₂-NH₄NO₃]-H₂O, APP-KCl-H₂O and quaternary systems is 44.70%, 32.86%, 45.56% and 46.23% (mass), respectively, indicating that the maximum nutrient content can be reached using raw materials of the corresponding systems to prepare liquid fertilizer. In the quaternary system, the content of ascends with the increase of the total nutrient content, while the contents of and CO(NH₂)₂-N increase with elevated total N. This work can help optimize the operating parameters for the production, storage and transportation of liquid fertilizers.

Key words: Water-soluble ammonium polyphosphate, Urea ammonium nitrate (UAN), Phase equilibria, Solubility, Thermodynamics

摘要： Based on the dynamic method, a quaternary system of ammonium polyphosphate (APP)-urea ammonium nitrate (UAN, CO(NH₂)₂-NH₄NO₃)-potassium chloride (KCl)-H₂O and its subsystems (APP-[CO(NH₂)₂-NH₄NO₃]-H₂O, KCl-[CO(NH₂)₂-NH₄NO₃]-H₂O and APP-KCl-H₂O) were systematically investigated at the temperature of 273.2 K. Each ternary phase diagram contains one invariant point and three crystallization regions. The crystallization regions are: (1) (NH₄)₃HP₂O₇, (NH₄)₄P₂O₇ and ((NH₄)₃HP₂O₇ + (NH₄)₄P₂O₇) for APP-[CO(NH₂)₂-NH₄NO₃]-H₂O diagram; (2) KCl, KNO₃ and (KCl + KNO₃) for KCl-[CO(NH₂)₂-NH₄NO₃]-H₂O diagram and (3) (NH₄)₃HP₂O₇, KCl and ((NH₄)₃HP₂O₇ + KCl) for APP-KCl-H₂O diagram. The quaternary phase diagram of APP-[CO(NH₂)₂-NH₄NO₃]-KCl-H₂O has no quaternary invariant point but includes four solid phase crystallization regions, i.e., (NH₄)₃HP₂O₇, (NH₄)₄P₂O₇, KNO₃ and KCl, in which the KNO₃ region occupies the largest area. The maximum total nutrient content (N + P₂O₅ + K₂O) existing as ionic forms in the APP-[CO(NH₂)₂-NH₄NO₃]-H₂O, KCl-[CO(NH₂)₂-NH₄NO₃]-H₂O, APP-KCl-H₂O and quaternary systems is 44.70%, 32.86%, 45.56% and 46.23% (mass), respectively, indicating that the maximum nutrient content can be reached using raw materials of the corresponding systems to prepare liquid fertilizer. In the quaternary system, the content of ascends with the increase of the total nutrient content, while the contents of and CO(NH₂)₂-N increase with elevated total N. This work can help optimize the operating parameters for the production, storage and transportation of liquid fertilizers.

关键词: Water-soluble ammonium polyphosphate, Urea ammonium nitrate (UAN), Phase equilibria, Solubility, Thermodynamics

Xingjuan Liang, Dehua Xu, Zhengjuan Yan, Jingxu Yang, Xinlong Wang, Zhiye Zhang, Jingli Wu, Honggang Zhen. Solid-liquid phase equilibrium for the system ammonium polyphosphate-urea ammonium nitrate-potassium chloride-water at 273.2 K[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 131-142.

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