四元体系Na_2B_4O_7-Na_2CO_3-NaCl-H_2O在0℃时的等温溶度研究

Study on the Isothermal Solubilities of the Quaternary System Na 2B 4O 7-Na 2CO 3- NaCl-H 2O at 0℃

第一次用等温方法测定了含硼酸盐的三元边界体系Ｎａ２Ｂ４Ｏ７－ＮａＣｌ－Ｈ２Ｏ和四元体系Ｎａ２Ｂ４Ｏ７－Ｎａ２ＣＯ３－ＮａＣｌ－Ｈ２Ｏ在０℃时的溶度。结果发现它们都是低共饱型体系。在三元体系中共饱点组成为ＮａＣｌ２６．１９％，Ｎａ２Ｂ４Ｏ７０．３６％（质量）；四元体系中共饱点组成为ＮａＣｌ２３．５５％，Ｎａ２Ｂ４Ｏ７０．６２％，Ｎａ２ＣＯ３４．０７％（质量），并且绘出了四元体系中的溶度图和等水线。

The studying on solubility of the quaternary system Na 2B 4O 7-Na 2CO 3- NaCl-H 2O and its boundary ternary system Na 2B 4O 7- NaCl-H 2O has been investigated by isothermal method at 0℃ first time.These systems are simple eutonic type,whose eutonic points are NaCl 26.19%, Na 2B 4O 7 0.36%,H 2O 74.45% saturacted solutions in the ternary system;NaCl 23.55%, Na 2B 4O 7 0.62%, Na 2CO 3 4.07%, H 2O 71.76% saturacted solutions in the quaternary system.The isogram of water content of the saturacted solutions in the quaternary system has been drawn.