Solubilities and densities of solution in the quaternary system NaCl-Na2 SO4-Na2 B4 O7-H2 O at 288 K were studied by iso-thermal equilibrium method.Based on the solubility data ,the phase diagram of the quaternary system was plotted ,which consists of three univariant curves,one invariant point and three crystallization fields corresponding to NaCl ,Na2B4O7· 10H2O and Na2SO4· 10H2O.The experimental results show that sodium chloride (NaCl)had the salting-out effect on sodium borate(Na2B4O7)and sodi-um sulphate(Na2SO4).% 采用等温溶解平衡法研究了四元体系Na2 B4 O7-Na2 SO4-NaCl-H2 O 在288 K的相平衡关系，测定了平衡液相的溶解度及其密度。由研究结果知该四元体系为简单共饱和型，无复盐及固溶体形成。根据实验数据绘制了相应的相图。相图中有一个共饱点，三条单变曲线，三个结晶区平衡固相分别为：Na2 B4 O7·10H2 O， Na2 SO4·10H2 O和NaCl。实验结果表明NaCl对Na2 B4 O7和Na2 SO4有盐析作用，并简要讨论了实验结果。
展开▼
