Solid鈥揕iquid Equilibrium for the Ternary Systems (Na2SO4 + NaH2PO4 + H2O) and (Na2SO4 + NaCl + H2O) at 313.15 K

详细信息    查看全文

• 作者：Xiaorui Zhang ; Yongsheng Ren ; Ping Li ; Huijuan Ma ; Wenjuan Ma ; Chengqi Liu ; Ya鈥檔an Wang ; Lingxin Kong ; Wei Shen
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：December 11, 2014
• 年：2014
• 卷：59
• 期：12
• 页码：3969-3974
• 全文大小：288K
• ISSN：1520-5134

文摘

Solid鈥搇iquid equilibrium in the ternary systems (Na₂SO₄ + NaH₂PO₄ + H₂O) and (Na₂SO₄ + NaCl + H₂O) at 313.15 K and atmospheric pressure was investigated by using isothermal solution saturation and moist residue method. The solubility and thermodynamic properties of the solution were determined. The phase diagrams and the diagrams of thermodynamic properties versus composition were constructed. It turned out that there was one invariant point, two uninvariant curves, and two crystallization regions. In the phase diagram of the ternary system (Na₂SO₄ + NaH₂PO₄ + H₂O) at 313.15 K, the crystallization region of Na₂SO₄ was obviously larger than the NaH₂PO₄路2H₂O crystalline region. When Na₂SO₄ was 11.57 wt % and NaH₂PO₄ was 44.41 wt %, this system reached saturation at 313.15 K. In the phase diagram of the ternary system (Na₂SO₄ + NaCl + H₂O) at 313.15 K, the crystallization region of Na₂SO₄ was significantly larger than the crystallization region of NaCl. When NaCl was 22.56 wt % and Na₂SO₄ was 5.00 wt %, this system reached saturation at 313.15 K. The research results could be used for the optimization solvent extraction process of sodium dihydrogen phosphate in industrial production.