水溶性聚磷酸铵-尿素硝酸铵-氯化钾体系在5℃下的固液相平衡研究  

Solid-liquid equilibrium of water-soluble ammonium polyphosphate-urea ammonium nitrate-potassium chloride system at 5℃

作　　者：梁杏娟 吴菁莉 许德华 王辛龙 LIANG Xing-juan;WU Jing-li;XU De-hua;WANG Xin-long(Ministry of Education Research Center for Comprehensive Utilization and Clean Processing Engineering of Phosphorus Resources,College of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院教育部磷资源综合利用与清洁加工工程研究中心,四川成都610065

出　　处：《应用化工》2023年第2期321-326,共6页Applied Chemical Industry

基　　金：国家自然科学基金(32172677)。

摘　　要：采用动态法测定了APP(水溶性聚磷酸铵,18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-KCl-H_(2)O体系及其子体系APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O、KCl-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O、APP(18-58-0)-KCl-H_(2)O在5℃下的固液相平衡数据,利用XRD分析平衡固相物相组成。结果表明:APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O、KCl-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O及APP(18-58-0)-KCl-H_(2)O体系分别含有两个单结晶相区:(NH_(4))_(3)HP_(2)O_(7)、(NH_(4))_(4)P_(2)O_(7);KNO_(3)、KCl;(NH_(4))_(3)HP_(2)O_(7)、KCl;一个共饱和结晶区:(NH_(4))_(3)HP_(2)O_(7)+(NH_(4))_(4)P_(2)O_(7);KNO_(3)+KCl;(NH_(4))_(3)HP_(2)O_(7)+KCl。APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-KCl-H_(2)O体系包含四个单晶区:(NH_(4))_(3)HP_(2)O_(7)、(NH_(4))_(4)P_(2)O_(7)、KNO_(3)、KCl。体系中N+P_(2)O_(5)+K_(2)O含量的最大、最小值分别为46.18%,14.46%。在APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-KCl-H_(2)O体系中,随着溶质的增加,饱和溶液中水的含量逐渐降低,水分含量的变化趋势与总养分N+P_(2)O_(5)+K_(2)O含量的变化趋势相反,溶液密度的变化趋势则与总养分N+P_(2)O_(5)+K_(2)O含量变化趋势相吻合。研究结果对配制不同氮磷钾比例的液体肥料具有参考价值。The solid-liquid equilibrium data of APP(ammonium polyphosphate,18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-KCl-H_(2)O system and its subsystems(APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O,KCl-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O,APP(18-58-0)-KCl-H_(2)O)at 5℃were respectively determined by the dynamic method.The phase composition of the equilibrium solid phase was analyzed by XRD.The results show that the APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O,KCl-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-H_(2)O and APP(18-58-0)-KCl-H_(2)O systems respectively contain two single crystal-phase regions[(NH_(4))_(3)HP_(2)O_(7),(NH_(4))_(4)P_(2)O_(7);KNO_(3),KCl;(NH_(4))_(3)HP_(2)O_(7),KCl],a co-saturated crystalline region[(NH_(4))_(3)HP_(2)O_(7)+(NH_(4))_(4)P_(2)O_(7);KNO_(3)+KCl;(NH_(4))_(3)HP_(2)O_(7)+KCl].APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-KCl-H_(2)O system contains four single crystal regions of(NH_(4))_(3)HP_(2)O_(7),(NH_(4))_(4)P_(2)O_(7),KNO_(3)and KCl.The maximum and minimum contents of N+P_(2)O_(5)+K_(2)O content in this system were 46.18%,14.46%.With the increase of solutes in the APP(18-58-0)-[CO(NH_(2))_(2)-NH_(4)NO_(3)]-KCl-H_(2)O system,the content of water in saturated solution decreased gradually.The change trend of water content is consequently opposite to that of N+P_(2)O_(5)+K_(2)O content.However,the density is consistent with the evolution of N+P_(2)O_(5)+K_(2)O content.The obtained results provide reference value for the preparation of liquid fertilizer with different proportions of NPK.

关 键 词：水溶性聚磷酸铵 尿素硝酸铵 相平衡 动态法 

分 类 号：TQ449[化学工程—化学肥料工业]