物理化学学报 >> 2001, Vol. 17 >> Issue (11): 1045-1048.doi: 10.3866/PKU.WHXB20011117

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Na2B4O7-Na2CO3-NaHCO3-NaBO2-H2O四元体系的等温溶度

李君;杨琴;张逢星;李恒欣;王振军   

  1. 西北大学化学系 陕西省物理无机化学重点实验室，西安　710069
  • 收稿日期:2001-04-16 修回日期:2001-07-13 发布日期:2001-11-15
  • 通讯作者: 张逢星 E-mail:zhangfx@nwu.edu.cn

Isothermal Solubility of Na2B4O7-Na2CO3-NaHCO3-NaBO2-H2O System at 25， 35 and 45 ℃

Li Jun;Yang Qin;Zhang Feng-Xing;Li Heng-Xin;Wang Zhen-Jun   

  1. Department of Chemistry, Northwest University, Key Laboratory of Phosicoinorganic Chemistry of Shaanxi Province， Xi′an　710069
  • Received:2001-04-16 Revised:2001-07-13 Published:2001-11-15
  • Contact: Zhang Feng-Xing E-mail:zhangfx@nwu.edu.cn

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摘要： 测定了四元体系Na2B4O7Na2CO3NaHCO3NaBO2H2O在25 、 35及45 ℃时的等温溶度和饱和溶液的折光率,绘制了相应的溶度图和组成折光率图.体系在35和45 ℃时有异成分化合物－天然碱（Na2CO3•NaHCO3•2H2O）生成.这些结果有助于揭示含硼碱湖的固体盐矿成因，对有关盐卤存在的反应2Na2CO3＋Na2B4O7＋H2O=4NaBO2＋2NaHCO3，揭示了相化学规律.

关键词: 溶度图, 相平衡, 四元体系, 天然碱, 硼酸盐, 碳酸盐

Abstract: Solubilities and refractive indices of saturated solutions of the system Na2B4O7Na2CO3 NaHCO3NaBO2H2O have been investigated by isothermal method at 25, 35 and 45 ℃. The complex trona (Na2CO3•NaHCO3•2H2O) was found in the system, therefore,there are 5 monosaturated fields,7 disaturated lines and 3 invariant points ：E1t（Na2B4O7•10H2O＋NaBO2•4H2O＋Na2CO3•nH2O）， E2t（Na2B4O7•10H2O＋ Na2CO3•NaHCO3•2H2O＋Na2CO3•nH2O）， E3t（Na2B4O7•10H2O＋Na2CO3•NaHCO3•2H2O＋NaHCO3）， at 25 ℃， n=10； 35 ℃， n=7； 45 ℃， n=1.

Key words: Solubility diagram, Phase equilibrium, Quaternary system, Trona, Borate, 　Carbonate