锂盐水溶液的热力学性质研究

Study on Thermodynamic Properties of Aqueous Lithium Salts

中文关键词:  锂盐水溶液，MSA方法，活度系数，溶解度

英文关键词:Aqueous lithium salt, MSA, Activity coefficient, Solubility

中文摘要:

      本文用Ｍｅｉｓｓｎｅｒ公式、Ｂｒｏｍｌｅｙ公式、Ｃｈｅｎ公式、Ｐｉｔｉｅｒ公式及经作者改进的平均球近似（ＭＳＡ）方法对锂盐水溶液（最大浓度达２０ｍｏｌ／ｋｇ）的离子平均活度系数进行了计算和比较，结果表明改进后的ＭＳＡ方法的计算精度最高。另外，本文还应用改进的ＭＳＡ法，使用由单一电解质水溶液离子平均活度系数得到的参数，不用任何混合参数，预测了２９８．１５ｋ时ＬｉＣｌ＋Ｌｉ２ＳＯ４和ＬｉＣｌ＋ＫＣｌ水溶液的等温溶解度图．其结果与文献实验值基本一致。

英文摘要:

      The mean ionic activity coefficients of aqueous lithium salts, the concentrations of which were up to 20m, were calculated by the Meissner equation, Bromley aquation, Chen equation,Pitier equation and the mean spherical approximation (MSA) method modified by the authors.The results show that among the above equations the accuracy of the modified MSA is the highest. Meanwhile, using the parameters obtained from the activity coefficients of single electrolyte solutions without any mixed parameters, the isothermal solubility diagrams of aqueous LiCl Li2So4 and LiCl KCl at 298. 15K were predicted by the modified MSA. The calculated results are coincident with the experimental data.