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化学学报
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化学学报 ›› 1992, Vol. 50 ›› Issue (9): 839-848.    下一篇

研究论文

含锂水盐体系热力学性质研究:LiCl-MgCl~2-H~O体系渗透系数和活度系数的等压测定

姚燕;孙柏;宋彭生;王瑞陵;陈敬清   

  1. 中国科学院青海盐湖研究所
  • 发布日期:1992-09-15

Thermodynamics of aqueous electrolyte solutions isopiestic determination of osmotic and activity coefficients in LiCl-MgCl~2-H~O at 25℃

YAO YAN;SUN BAI;SONG PENGSHENG;WANG RUILING;CHEN JINGQING   

  • Published:1992-09-15

PDF

490

被引次数

120

25℃下,用等压法测定了单盐水溶液(浓度范围分别为0.5-19.8mol.kg^-1,0.3-6.0mol.kg^-1)以及混合水溶液(离子强度范围为0.6-19.4mol.kg^-1)的水活度和渗透系数,同时测定了LiCl的溶解度.该体系的实验等水活度线符合本工作推导出的Zdanovskii规则扩展式,用Gibbs-Duhem方程和改进的Mckay-perring方法计算了单盐和混合盐水溶液的活度系数.由本实验获得的渗透系数拟合了Pitzer单盐和混合作用参数,检验了Pitzer方程对该体系渗透系数、活度系数和溶解度预测的适用性.用Pitzer方程取本工作得到的参数计算的溶解度与文献实验值基本一致.

关键词: 水, 氯化镁, 渗透系数, 氯化锂, 活度系数, 等压测定

The osmotic and activity coefficients of aqueous mixtures of LiCl and MgCl2 in the range low concentration to near crystallization limits and the solubility of LiCl in water were measured by using the isopiestic method at 25? The experimental iso-water activity lines obey extended Zdanovskii rule well. The mean activity coefficients of LiCl and MgCl2 in pure and mixing solns were obtained form the osmotic coefficients by Gibbs-Duhem equation and Mc Kay-Perring method, resp. The predicted solubilities for the system studied using Pitzer's approach were shown to be in reasonable agreement with experimental results.

Key words: WATER, MAGNESIUM CHLORIDE, OSMOTIC COEFFICIENT, LITHIUM CHLORIDE, ACTIVITY COEFFICIENT

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