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

Haijiao Lu; Jingkang Wang; Jun Yu; Yuefeng Wu; Ting Wang; Ying Bao; Dou Ma; Hongxun Hao

doi:10.1016/j.cjche.2016.08.016

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

Chemical Engineering Thermodynamics | Updated：2026-01-06

- Phase equilibria for the pseudo-ternary system (NaCl+Na₂SO₄+H₂O) of coal gasification wastewater at T=(268.15 to 373.15) K
- Chinese Journal of Chemical Engineering Vol. 25, Issue 7, Pages: 955-962(2017)
- Affiliations：
  
  1. National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University,Tianjin,China,300072
  2. Collaborative Innovation Center of Chemical Science and Engineering,Tianjin,China,300072
  3. East China Engineering Science and Technology Co., Ltd.,Hefei,China,230024
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2016.08.016
  CLC：
- Published：2017
- Accepted：
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SO DOI： 10.1016/j.cjche.2016.08.016.

摘要

Abstract

The pseudo-ternary system (NaCl + Na

+ H

O) of coal gasification wastewater was studied at

=(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 + Na

+ H

O) in coal gasification wastewater and in pure water. However

the solubility on the Na

-rich side of coal gasification wastewater was apparently higher than that of pure water. The increase in the solubility of Na

was most likely caused by the effects of other impurities apart from NaCl and Na

in coal gasification wastewater. The measured data and phase equilibrium diagrams can provide fundamental basis for salt rec

overy in coal gasification wastewater.

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