摘要
采用等温溶解平衡法研究了308.15 K下三元体系LiCl-Li_(2)B_(4)O_(7)-H_(2)O的相平衡,测得平衡溶液的液相组成及折射率,绘制了相图。研究发现:该体系为简单共饱和型,没有复盐和固溶体生成。相图有一个共饱点,单固相结晶区两个,等温溶解曲线两条组成。测定平衡组成为w(Li_(2)B_(4)O_(7))=0.45592%,w(LiCl)=36.503%。单组分固相结晶的形式分别为Li_(2)B_(4)O_(7)·3H_(2)O和LiCl·H_(2)O。将该体系在298.15 K、308.15 K、323.15 K下的溶解度曲线分别做了对比分析,发现不同温度下的溶解度曲线的变化趋势一致。308.15 K下该体系的折光率随LiCl的质量分数增加而增大,LiCl对Li_(2)B_(4)O_(7)具有盐析作用。
The phase equilibrium of ternary system LICL-Li_(2)B_(4)O_(7)-H_(2)O at 308.15 K was studied by isothermal solution equilibrium method.The composition and refractive index of the equilibrium solution were measured and the phase diagram was drawn.It is found that the system is simple co-saturated,without double salt and solid solution formation.The phase diagram consists of one saturation point,two single solid crystal regions and two isothermal dissolution curves.The balance composition was w(Li_(2)B_(4)O_(7))=0.45592%,w(LiCl)=36.503%.The single-component solid phase crystals are Li_(2)B_(4)O_(7)·3H_(2)O and LiCl·H_(2)O,respectively.The solubility curves of the system at 298.15 K,308.15 K and 323.15 K were compared and analyzed,and it was found that the variation trend of the solubility curves at different temperatures was the same.At 308.15 k,the refractive index of the system increases with the mass fraction of LiCl,and LiCl has a salting effect on Li_(2)B_(4)O_(7).
作者
相楠
杨兰
Xiang Nan;Yang Lan(School of Chemistry and Chemical Engineering,Linyi University,Linyi 276000,China)
出处
《广东化工》
CAS
2024年第20期1-3,共3页
Guangdong Chemical Industry
基金
山东省科学技术厅其他(自科类预算制项目)(ZR2020MB051)。
关键词
溶解度
稳定相平衡
氯化锂
硼酸锂
solubility
stable phase equilibrium
lithium chloride
lithium tetraborate
