Wu Jiangman, Wu Zhaojun, Liu Jinrong
School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China.
ACS Omega. 2020 Apr 21;5(17):10133-10144. doi: 10.1021/acsomega.0c00777. eCollection 2020 May 5.
Solid-liquid equilibria in the quinary system NaCl + NaOH + NaCO + NaSO + HO at 363.15 K were measured by the wet residue method, and the equilibrium solid phases and solubilities of saturated solutions were determined experimentally. Using the experimental results, dry-salt phase diagrams and water diagrams versus composition diagrams were plotted (saturated with saturated sodium chloride, sodium hydroxide, sodium carbonate, and sodium sulfate). The experimental results show that there are a solid solution (γ-salt, mNaSO·NaCO) and co-saturation complex salts (S3, NaSO·NaCl·NaOH and S1, NaOH·NaSO) formed in this quinary system. Based on Xu's activity coefficient model, the solubilities of the quinary system NaCl + NaOH + NaCO + NaSO + HO at 363.15 K were calculated with corresponding parameters. Comparing the experimental and calculated results, it was shown that the calculated values had a good agreement with the experimental ones.
采用湿渣法测定了五元体系NaCl + NaOH + Na₂CO₃ + Na₂SO₄ + H₂O在363.15 K时的固液平衡，实验测定了平衡固相和饱和溶液的溶解度。利用实验结果绘制了干盐相图以及与组成图相关的水图（以饱和氯化钠、氢氧化钠、碳酸钠和硫酸钠为饱和状态）。实验结果表明，该五元体系中形成了一种固溶体（γ-盐，mNa₂SO₄·Na₂CO₃）和共饱和复盐（S3，Na₂SO₄·NaCl·NaOH和S1，NaOH·Na₂SO₄）。基于徐的活度系数模型，用相应参数计算了五元体系NaCl + NaOH + Na₂CO₃ + Na₂SO₄ + H₂O在363.15 K时的溶解度。将实验结果与计算结果进行比较，结果表明计算值与实验值吻合良好。
