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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
0
(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
投稿时间:2016-05-03
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
(Key Laboratory of Coal Gasification and Energy Chemical of Ministry of Education, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China)
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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