摘要
利用等温溶解平衡法测定了三元水盐体系Na_2SO_4-Na_2S_2O_(3)-H_2O、Na_2S_2O_(3)-NaSCNH_2O及Na_2SO_4-NaSCN-H_2O在313.15K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313.15K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,Na_2SO_4-Na_2S_2O_(3)-H_2O平衡固相分别为Na_2SO_4和Na_2S_2O_(3)·5H_2O;Na_2S_2O_(3)-NaSCN-H_2O平衡固相分别为Na_2S_2O_(3)·5H_2O和NaSCN;Na_2SO_4-NaSCN-H_2O的平衡固相分别为Na_2SO_4和NaSCN。结果表明,Na_2S_2O_(3)和NaSCN对Na_2SO_4有较强的盐析作用。
Phase equilibria data of the ternary Na_(2)SO_(4)-Na_(2)S_(2)O_(3)-H_(2)O,Na_(2)S_(2)O_(3)-NaSCN-H_(2)O and Na_(2)SO_(4)-NaSCN-H_(2)O 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 Na_(2)SO_(4)-Na_(2)S_(2)O_(3)-H_(2)O is composited of sodium sulfate(Na2SO4)and sodium thiosulfate pentahydrate(Na2S203·5H2O),respectively.Sodium thiosulfate pentahydrate and sodium rhodanate(NaSCN)are the components of the solid phase of Na2S203-NaSCN_H2O,and the solid phase of Na2S04-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 Na2S04.
作者
程锦
吴诗勇
吴幼青
黄胜
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)
出处
《华东理工大学学报(自然科学版)》
CAS
CSCD
北大核心
2017年第1期56-60,共5页
Journal of East China University of Science and Technology
关键词
三元相图
水盐体系
硫酸钠
硫代硫酸钠
硫氰酸钠
ternary phase diagram
salt-water system
sodium sulfate
sodium thiosulfate pentahydrate
sodium rhodanate
