三元体系LiCl-KCl-H2O和LiCl-SrCl2-H2O在288.15 K时稳定相平衡研究  

Phase equilibria in ternary systems LiCl-KCl-H2O and LiCl-SrCl2-H2O at 288.15 K

作　　者：杨森楠 张子义 李栋婵 YANG Sen-nan;ZHANG Zi-yi;LI Dong-chan(School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China;Engineering Research Center of Seawater Utilization Technology Ministry of Education,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学化工学院,天津300130 [2]河北工业大学海水资源高效利用化工技术教育部工程研究中心,天津300130

出　　处：《化学工程》2019年第12期54-58,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21406048,U1507109);河北省应用基础研究重点基础项目(13963103D);天津市应用基础与前沿技术研究计划项目(17JCYBJC19500,15JCQNJC06100);河北省自然科学基金资助项目(B2017202198)

摘　　要：采用等温溶解平衡法,研究了三元体系LiCl-KCl-H2O和LiCl-SrCl2-H2O在288.15 K时的稳定相平衡关系,根据平衡时的溶解度数据和固相鉴定结果,绘制了三元体系LiCl-KCl-H2O和LiCl-SrCl2-H2O在288.15 K时的稳定相图。研究结果表明:三元体系LiCl-KCl-H2O在T=288.15 K时相图中有1个共饱点、2条单变量溶解度曲线、2个固相结晶区,结晶区对应平衡固相为LiCl·2H2O和KCl,其中,KCl结晶区远大于LiCl·2H2O结晶区,表明LiCl对KCl有很强的盐析效应。三元体系LiCl-SrCl 2-H 2 O在T=288.15 K时相图中有2个共饱点、3条单变量溶解度曲线和3个固相结晶区,结晶区对应平衡固相为LiCl·2H2O,SrCl2·2H2O和SrCl2·6H2O,其中SrCl2·6H2O结晶区最大,其次是SrCl2·2H2O结晶区,LiCl·2H2O结晶区最小,表明SrCl2·6H2O最容易析出。2个体系中均无复盐以及固溶体形成,属于简单共饱和型体系。The phase equilibria in the ternary systems LiCl-KCl-H2O and LiCl-SrCl2-H2O at 288.15 K was determined with the method of isothermal solution saturation.According to the solubility data and the corresponding equilibrium solid phase,the isothermal phase diagrams of the two ternary systems at 288.15 K were plotted.The experimental results show that the phase diagram of first system has one invariant point,two univariant curves and two crystallization fields corresponding to LiCl·2H2O and KCl.The area of KCl crystallization field is much larger than that of LiCl·2H2O which means LiCl has the strong salting-out effect to KCl.The phase diagram of the second system at 288.15 K has two invariant points,three univariant curves and three crystallization fields corresponding to LiCl·2H2O,SrCl2·2H2O and SrCl2·6H2O.The area of SrCl2·6H2O crystallization field is the largest,then SrCl2·6H2O and the smallest one is LiCl·2H2O,which means SrCl2·6H2O is the easiest to crystal from the system.Both of the two ternary systems are simple total saturated type,and neither double salt nor solid solution were found.

关 键 词：相平衡 溶解度 锂盐 锶盐 

分 类 号：O642[理学—物理化学]