Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (11): 1045-1048.doi: 10.3866/PKU.WHXB20011117

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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

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