CsCl-PEG 400-H_2O三元体系在15,25和35℃时的等温溶解度、密度及折光率研究  

Equilibrium Solubility,Densities,and Refractive Indices for CsCl-PEG 400-H_2O Ternary System at 15,25 and 35 ℃

作　　者：康永宁[1] 李淑妮[1] 翟全国[1] 蒋育澄[1] 胡满成[1] 

机构地区：[1]陕西师范大学化学与材料科学学院,陕西省大分子科学重点实验室,陕西西安710062

出　　处：《稀有金属》2011年第4期548-557,共10页Chinese Journal of Rare Metals

基　　金：国家自然科学基金资助项目(20871079)

摘　　要：采用半微量相平衡测定装置和高精度密度-折光率测定仪,精确测定了CsCl-PEG 400-H2O三元体系在15,25和35℃3个温度下不同组分百分比溶液的折光率和密度数据,通过关联密度和折光率数据获得了CsCl在上述温度下的等温溶解度。对饱和体系的溶解度研究表明:在同一温度下CsCl的溶解度随聚乙二醇质量分数的增加而减小;在不同温度下CsCl的溶解度随温度的升高而增大。采用经验方程lnS=A1+A2w2+A3w22+A4w23对饱和体系的溶解度进行了关联,效果较好。对不饱和体系的研究表明:当盐含量一定时,随着醇水比例的增加,体系的密度不断增大,折光率也随盐含量增加而增大;当醇水质量比一定时,体系的密度和折光率随盐含量的增加而增大,对不饱和体系的密度和折光率用经验方程Y=(A0+A1w2+A2w1+A3w1w2+A4w2w12)×exp[A5(w1/w3)+A6(w1/w3)2]进行拟合,拟合效果较好,同时给出了体系的盐析率曲线。本研究不仅为溶液化学提供了基础数据,也为混合溶液中盐和醇的分离纯化提供一种新的方法和思路,对CsCl进一步的应用、开发和研究具有一定的参考价值。The phase equilibriums for CsCl-PEG 400-H2O ternary system were investigated at 15,25 and 35 ℃ respectively.The density and refractive index data of the solution with different percentage concentration were determined and used to calculate the isothermal solubility of CsCl at the three investigated temperatures.It was revealed that the solubility of CsCl decreased with the mass fraction of PEG 400 at the same temperature,and the solubility of CsCl increased with the system temperature increasing.The experience expression lnS=A1＋A2w2＋A3w22＋A4w23 was satisfactorily used to correlated the solubility of the saturated ternary systems.The unsaturated systems were also studied.It was confirmed that when the salt content was constant,the density and the refractive index data increased continuously with the alcohol-water ratio increasing in this system.On the other hand,when the alcohol-water ratio was constant,the density and the refractive index data increased as the salt concentration increased.The experimental data of the density and the refractive index of the unsaturated ternary systems were fitted by the equation： Y=（A0＋A1w2＋A2w1＋A3w1w2＋A4w2w12）×exp[A5（w1/w3）＋A6（w1/w3）2].At the same time,the salting-out curves of CsCl by PEG 400 were also obtained.The work not only provided the basic data for the solution chemistry,but also gave new insights into the separation and purification methods of salt and alcohol in mixed solution.It was also significant to further application,development and research of CsCl.

关 键 词：CSCL PEG400 溶解度 密度 折光率 

分 类 号：TF826.5[冶金工程—有色金属冶金]