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Na2SO4、Na2S2O3和NaSCN水盐体系313.15 K相平衡
程锦,吴诗勇,吴幼青,黄胜
作者单位E-mail
程锦 华东理工大学资源与环境工程学院, 煤气化及能源化工教育部重点实验室, 上海 200237  
吴诗勇 华东理工大学资源与环境工程学院, 煤气化及能源化工教育部重点实验室, 上海 200237 wsy@ecust.edu.cn 
吴幼青 华东理工大学资源与环境工程学院, 煤气化及能源化工教育部重点实验室, 上海 200237  
黄胜 华东理工大学资源与环境工程学院, 煤气化及能源化工教育部重点实验室, 上海 200237  
摘要:
利用等温溶解平衡法测定了三元水盐体系Na2SO4-Na2S2O3-H2O、Na2S2O3-NaSCN-H2O及Na2SO4-NaSCN-H2O在313.15 K时的固液相平衡数据,并结合X射线衍射确定相平衡时的固相,绘制了三元体系相图。3种体系在313.15 K时均无复盐或固溶体形成,属于简单共饱和体系。对应相图中均包含1个共饱和点、2个单盐结晶区和2条单变量曲线。在三元体系中,Na2SO4-Na2S2O3-H2O平衡固相分别为Na2SO4和Na2S2O3·5H2O;Na2S2O3-NaSCN-H2O平衡固相分别为Na2S2O3·5H2O和NaSCN;Na2SO4-NaSCN-H2O的平衡固相分别为Na2SO4和NaSCN。结果表明,Na2S2O3和NaSCN对Na2SO4有较强的盐析作用。
关键词:  三元相图  水盐体系  硫酸钠  硫代硫酸钠  硫氰酸钠
DOI:10.14135/j.cnki.1006-3080.2017.01.009
分类号:
基金项目:
Phase Equilibria of Na2SO4、Na2S2O3 and NaSCN Salt-Water Systems at 313.15 K
CHENG Jin,WU Shi-yong,WU You-qing,HUANG Sheng
Abstract:
Phase equilibria data of the ternary Na2SO4-Na2S2O3-H2O,Na2S2O3-NaSCN-H2O and Na2SO4-NaSCN-H2O systems at 313.15 K were determined by the isothermal dissolution equilibrium method.The equilibrium solid phases were determined by X-ray spectroscopy,and the phase diagrams of the ternary systems were drawn.There is no double salt or solid solution formed,and the three systems belong to a simple eutectic system.The phase diagrams of the ternary systems have one invariant point and two univariant curves at the boundary of two crystallization fields.The equilibrium solid phase of Na2SO4-Na2S2O3-H2O is composited of sodium sulfate(Na2SO4) and sodium thiosulfate pentahydrate (Na2S2O3·5H2O),respectively.Sodium thiosulfate pentahydrate and sodium rhodanate (NaSCN) are the components of the solid phase of Na2S2O3-NaSCN-H2O,and the solid phase of Na2SO4-NaSCN-H2O consists of sodium sulfate and sodium rhodanate.The experimental results suggest that Na2S2O3 and NaSCN show an obvious decrease of the solubility of Na2SO4.
Key words:  ternary phase diagram  salt-water system  sodium sulfate  sodium thiosulfate pentahydrate  sodium rhodanate

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