三元体系K2B4O7-KBr-H2O在323K的相平衡研究

Phase Equilibrium of the Ternary System K2B4O7-KBr-H2O at 323 K

中文关键词:  水盐体系  相平衡  硼酸钾  溴化钾

英文关键词:Salt-water system  Phase equilibrium  Potassium borate  Potassium bromide  

中文摘要:

      采用等温溶解平衡法研究了三元体系K2B4O7-KBr-H2O在323 K的相平衡关系及密度。研究发现,该三元体系为简单共饱和型,无复盐及固溶体形成。根据溶解度数据绘制了相图,相图中有一个共饱点,两条单变曲线,单变量曲线所对应的平衡固相分别为K2B4O7.4H2O和KBr;实验结果表明KBr对K2B4O7有较强的盐析作用。并简要讨论了密度变化规律。

英文摘要:

      In this paper,equilibrium relationship and densities of solution in the ternary system K2B4O7-KBr-H2O at 323 K were studied by isothermal equilibrium method.The experimental results show that the system is a type of simple common saturation and without complex salt and solid solution.Based on the solubility data,the phase diagram of the ternary system was plotted,which consists of one invariant point,two univariant curves and two crystallization fields,K2B4O7·4H2O and KBr.The experimental results show that KBr has the salting-out effect on K2B4O7.Densities transformation rules were also discussed.