Liquid-solid Phase Equilibrium for the Quinary System Na+, Mg2+//Cl-, SO42-, NO3-, H2O Saturated with NaCl at 298.16 K

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Liquid-solid Phase Equilibrium for the Quinary System Na⁺, Mg²⁺//Cl^-, SO₄^2-, NO₃^-, H₂O Saturated with NaCl at 298.16 K

HUANG Xue-Li*, MA Feng-Yun, SUN Hong-Mei

College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

Received:2007-05-28 Revised:1900-01-01 Online:2008-02-10 Published:2008-02-10
Contact: HUANG Xue-Li

Abstract

Abstract: Solubilities in the system Na⁺, Mg²⁺//Cl^-, SO₄^2-, NO₃^-, H₂O saturated with NaCl were investi-gated by isothermal method at 298.16 K. According to the experimental data, the solvent-free, NaCl-free and water projection phase diagrams of this system were plotted. In this system, eight crystallization fields with two saturated salts were observed: MgSO₄·Na₂SO₄·4H₂O+NaCl, NaNO₃+NaCl, NaNO₃·Na₂SO₄·2H₂O+NaCl, MgCl₂·6H₂O+NaCl, Na₂SO₄+NaCl, Mg(NO₃)₂·6H₂O+NaCl, NaCl+MgSO₄·7H₂O and MgSO₄ ·(1—6)H₂O+NaCl. The respective crystallization areas are being separated from each other by thirteen univariant curves with three saturated salts which intersect in six invariant points corresponding to NaCl+Na₂SO₄+Na₂SO₄·MgSO₄·4H₂O+Na₂SO₄·NaNO₃·2H₂O, NaCl+NaNO₃+Na₂SO₄·MgSO₄·4H₂O+Na₂SO₄·NaNO₃·2H₂O, NaCl+NaNO₃+Na₂SO₄·MgSO₄·4H₂O+MgSO₄·7H₂O, NaCl+NaNO₃+Mg(NO₃)₂·6H₂O+MgSO₄·7H₂O, MgSO₄·(1—6)H₂O+Mg(NO₃)₂·6H₂O+MgSO₄·7H₂O+NaCl, MgSO₄·(1—6)H₂O+NaCl +MgCl₂·6H₂O+Mg(NO₃)₂·6H₂O. Application of these phase diagrams were discussed for industry.

Key words: Quinary system, Brine, Nitrate, Phase equilibrium

CLC Number:

O642

TrendMD:

HUANG Xue-Li*, MA Feng-Yun, SUN Hong-Mei. Liquid-solid Phase Equilibrium for the Quinary System Na⁺, Mg²⁺//Cl^-, SO₄^2-, NO₃^-, H₂O Saturated with NaCl at 298.16 K[J]. Chem. J. Chinese Universities, doi: .

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Liquid-solid Phase Equilibrium for the Quinary System Na⁺, Mg²⁺//Cl^-, SO₄^2-, NO₃^-, H₂O Saturated with NaCl at 298.16 K

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