SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (7): 955-962.DOI: 10.1016/j.cjche.2016.08.016

• Chemical Engineering Thermodynamics • 上一篇    下一篇

Phase equilibria for the pseudo-ternary system (NaCl+Na2SO4+H2O) of coal gasification wastewater at T=(268.15 to 373.15) K

Haijiao Lu1,2, Jingkang Wang1,2, Jun Yu3, Yuefeng Wu3, Ting Wang1,2, Ying Bao1,2, Dou Ma3, Hongxun Hao1,2   

  1. 1 National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;
    3 East China Engineering Science and Technology Co., Ltd., Hefei 230024, China
  • 收稿日期:2016-06-21 修回日期:2016-08-15 出版日期:2017-07-28 发布日期:2017-08-17
  • 通讯作者: Hongxun Hao,E-mail address:hongxunhao@tju.edu.cn
  • 基金资助:
    Supported by the National Key Research and Development Program of China (2016YFB0600504).

Phase equilibria for the pseudo-ternary system (NaCl+Na2SO4+H2O) of coal gasification wastewater at T=(268.15 to 373.15) K

Haijiao Lu1,2, Jingkang Wang1,2, Jun Yu3, Yuefeng Wu3, Ting Wang1,2, Ying Bao1,2, Dou Ma3, Hongxun Hao1,2   

  1. 1 National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;
    3 East China Engineering Science and Technology Co., Ltd., Hefei 230024, China
  • Received:2016-06-21 Revised:2016-08-15 Online:2017-07-28 Published:2017-08-17
  • Supported by:
    Supported by the National Key Research and Development Program of China (2016YFB0600504).

摘要: The pseudo-ternary system (NaCl + Na2SO4 + H2O) of coal gasification wastewater was studied at T=(268.15 to 373.15) K. The solubility and density of the equilibrium liquid phase were determined by the isothermal solution saturation method. The equilibrium solids were also investigated by the Schreinemaker's method of wet residues and X-ray powder diffraction (XRD). According to the experimental data, the phase diagrams were determined. It was found that there was no significant solubility difference on the NaCl-rich side between the ternary system (NaCl + Na2SO4 + H2O) in coal gasification wastewater and in pure water. However, the solubility on the Na2SO4-rich side of coal gasification wastewater was apparently higher than that of pure water. The increase in the solubility of Na2SO4 was most likely caused by the effects of other impurities apart from NaCl and Na2SO4 in coal gasification wastewater. The measured data and phase equilibrium diagrams can provide fundamental basis for salt recovery in coal gasification wastewater.

关键词: Pseudo-ternary system, Phase equilibria, Thermodynamics, Waste water, Recovery

Abstract: The pseudo-ternary system (NaCl + Na2SO4 + H2O) of coal gasification wastewater was studied at T=(268.15 to 373.15) K. The solubility and density of the equilibrium liquid phase were determined by the isothermal solution saturation method. The equilibrium solids were also investigated by the Schreinemaker's method of wet residues and X-ray powder diffraction (XRD). According to the experimental data, the phase diagrams were determined. It was found that there was no significant solubility difference on the NaCl-rich side between the ternary system (NaCl + Na2SO4 + H2O) in coal gasification wastewater and in pure water. However, the solubility on the Na2SO4-rich side of coal gasification wastewater was apparently higher than that of pure water. The increase in the solubility of Na2SO4 was most likely caused by the effects of other impurities apart from NaCl and Na2SO4 in coal gasification wastewater. The measured data and phase equilibrium diagrams can provide fundamental basis for salt recovery in coal gasification wastewater.

Key words: Pseudo-ternary system, Phase equilibria, Thermodynamics, Waste water, Recovery