Effect of Phosphate and Sulfate on the Solubility of Na2SO4 in Supercritical Water

Xing Ying Tang; Shu Zhong Wang; Meng Meng Ren; Pan Pan Sun

doi:10.4028/www.scientific.net/AMM.522-524.290

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 522-524Effect of Phosphate and Sulfate on the Solubility...

Effect of Phosphate and Sulfate on the Solubility of Na₂SO₄ in Supercritical Water

Abstract:

The solubility of Na₂SO₄mixed with K₂SO₄and K₃PO₄were investigated by a continuous kettle-reactor system at temperature within the range of 320°C to 420°C, 24MPa. The solubility of Na₂SO₄showed a drastic reduce at a temperature of about 360°C. Ionic chromatography was used to determine the concentration of Na₂SO₄in effluent. Among 355°C to 380°C, the presence of K₂SO₄reduced the solubility of Na₂SO₄, due to common-ion effect. The addition of K₃PO₄could inhibit the salts deposition in the supercritical water system, effectively. The variation degree is more remarkable as the addition of K₂SO₄and K₃PO₄increased.