无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2021, Vol. 53 ›› Issue (1): 30-35.doi: 10.11962/1006-4990.2020-0103

• 研究与开发 • 上一篇    下一篇

283.15 K下三元KCl-NH4Cl-H2O和KH2PO4-NH4H2PO4-H2O体系固-液相平衡测定与关联

杨家敏(),朱静(),胡雪,吴强,李天祥   

  1. 贵州大学化学与化工学院,贵州贵阳 550025
  • 收稿日期:2020-07-11 出版日期:2021-01-10 发布日期:2021-01-08
  • 通讯作者: 朱静
  • 作者简介:杨家敏(1994— ),女,硕士研究生,研究方向为化学工艺;E-mail: 284226775@qq.com
  • 基金资助:
    国家自然科学基金(21868010);贵州省科技计划项目(黔科合平台人才[2018]5781号)

Determination and correlation for solid-liquid phase equilibrium of ternary KCl-NH4Cl-H2O and KH2PO4-NH4H2PO4-H2O systems at 283.15 K

Yang Jiamin(),Zhu Jing(),Hu Xue,Wu Qiang,Li Tianxiang   

  1. School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
  • Received:2020-07-11 Online:2021-01-10 Published:2021-01-08
  • Contact: Zhu Jing

摘要:

采用等温溶解平衡法测定了283.15 K下KCl-NH4Cl-H2O和KH2PO4-NH4H2PO4-H2O两个三元体系的溶解度,采用X射线衍射法和湿渣法联合测定平衡固相结构和组成。结果表明,两个体系平衡固相均有部分互溶的固溶体产生,两个相图分别包含一个共饱和点、两条单变量曲线和6个区域。采用Pitzer模型关联和计算两个体系的溶解度数据,结果表明,KCl-NH4Cl-H2O体系的最大相对误差为3.096 9%,最小相对误差为0.038 3%,KH2PO4-NH4H2PO4-H2O体系的最大相对误差为5.935 6%,最小相对误差为0.069 8%,模型计算值与实验值基本一致。

关键词: 相平衡, 溶解度, Pitzer模型, 固溶体

Abstract:

The solubility of ternary systems KCl-NH4Cl-H2O and KH2PO4-NH4H2PO4-H2O were determined by isothermal dissolution equilibrium method at 283.15 K.The structure and composition of the equilibrium solid phase were determined by the combination of X-ray diffraction and Schreinemakers′ wet residue method.Results showed that the equilibrium solid pha-se of two systems had solid solutions of partially miscible,which respectively contained one co-saturation crystallization point,two univariate curves and six zones.The solubility data of the two systems were correlated and calculated by Pitzer model.Results showed that the maximum relative error and the minimum relative error of calculated data of KCl-NH4Cl-H2O ternary system were 3.096 9% and 0.038 3% resepectively,and the maximum relative error and the minimum relative error of calculated data of KH2PO4-NH4H2PO4-H2O ternary system were 5.935 6% and 0.069 8% resepectively.The calculated value of Pitzer model was basically consistent with the experimental value.

Key words: phase equilibrium, solubility, Pitzer model, solid solution

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