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›› 2012, Vol. 12 ›› Issue (4): 625-630.

• 过程与工艺 • 上一篇    下一篇

二水硫酸钙在铵盐溶液中溶解度测定及热力学计算

田萍 宁朋歌 曹宏斌 李志宝   

  1. 中国科学院过程工程研究所绿色过程与工程重点实验室 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程工程研究所绿色过程与工程重点实验室
  • 收稿日期:2012-05-23 修回日期:2012-07-02 出版日期:2012-08-20 发布日期:2012-08-20
  • 通讯作者: 田萍

Solubility Measurement of Calcium Sulfate Dihydrate in NH4Cl-(NH4)2SO4 Solutions

TIAN Ping NING Peng-ge CAO Hong-bin LI Zhi-bao   

  1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, CAS Institute of Process Engineering，Chinese Academy of Sciences Institute of Processing Engineering ，CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2012-05-23 Revised:2012-07-02 Online:2012-08-20 Published:2012-08-20
  • Contact: TIAN Ping

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被引次数

23

摘要： 利用溶解法测定了二水硫酸钙(CaSO4×2H2O)在NH4Cl-H2O体系和NH4Cl-(NH4)2SO4-H2O体系中298.15~343.15 K温度范围内的溶解度. 结果表明，CaSO4×2H2O在2个体系中的溶解度均随NH4Cl浓度增加而增大；温度对CaSO4×2H2O的溶解度影响不明显. 利用混合电解质NRTL模型对实验数据进行模拟计算，得到了新的能量相互作用参数，建立了CaSO4×2H2O(s)-NH4Cl-(NH4)2SO4-H2O体系的混合电解质模型，计算值与实验值相对偏差为2.36%.

关键词: 二水硫酸钙, 溶解度, 氯化铵, 硫酸铵, 电解质NRTL模型

Abstract: The solubility of CaSO4×2H2O in the solution of NH4Cl and mixed solution of NH4Cl-(NH4)2SO4 was studied using dissolution method in a temperature range from 298.15 to 343.15 K. The results showed that in the two solutions the solubility of CaSO4×2H2O increased with increasing of NH4Cl concentration, but the temperature had little effect. In addition, a mixed electrolyte NRTL model was employed to calculate the solubility of CaSO4×2H2O in different concentrations of NH4Cl at various temperatures. New model parameters for electrolyte NRTL model were obtained via regression of experimental data. The calculated solubility was in good agreement with experimental values with the relative average deviation of 2.36%.

Key words: calcium sulfate dehydrate (gypsum), solubility, ammonium chloride, ammonium sulfate, electrolyte NRTL model

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