298.16K Na^+,K^+,Mg^(2+)//Cl^-,NO_3^--H_2O五元体系的相平衡研究  

Study on the Phase Equilibrium for the Quinary System Na^+,K^+,Mg^(2+)//Cl^-,NO_3^--H_2O at 298.16K

作　　者：黄雪莉[1] 朱丽娟[2] 梁涛[2] 宋彭生[3] 

机构地区：[1]大连理工大学化工学院,大连116024 [2]新疆大学化学化工学院,乌鲁木齐830046 [3]中国科学院青海盐湖研究所,西宁810008

出　　处：《化学学报》2007年第9期798-802,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20466003)资助项目.

摘　　要：采用等温溶解平衡法研究了五元体系Na+,K+,Mg2+//Cl-,NO3--H2O在298.16K、氯化钠饱和时各盐的溶解度和饱和溶液的物化性质(密度,电导率)以及四元体系Na+,Mg2+//Cl-,NO3--H2O的相平衡关系.研究表明:在298.16K,氯化钠饱和时该五元体系溶解度相图由六个结晶区、九条单变量溶解度曲线和四个零变量点构成,六个结晶区分别对应于NaNO3+NaCl,KNO3+NaCl,KCl+NaCl,Mg(NO3)2·6H2O+NaCl,MgCl2·6H2O+NaCl和复盐KCl·MgCl2·6H2O+NaCl;在298.16K时,该四元体系的相图由四个结晶区、五条单变量溶解度曲线和二个零变量点构成,四个结晶区分别对应于NaNO3,NaCl,Mg(NO3)2·6H2O,MgCl2·6H2O.Solubilities of each salt in the system Na^＋, K^＋, Mg^2＋//Cl^-, NO3 -H2O saturated with NaCl and the system Na^＋, Mg^2＋//Cl^-, NO3 ^--H2O were investigated by isothermal method at 298.16 K. The physico-chemical properties, such as densities and conductivities, of the corresponding solutions were determined too. The dry salt phase diagram of the system Na^＋, K^＋, Mg^2＋//Cl^-, NO3 ^--H2O saturated with NaCl consists of six crystallization regions （NaNO3＋NaCl, KNO3＋NaCl, KCl＋NaCl, Mg（NO3）2·6H2O＋ NaCl, MgCl2·6H2O＋NaCl and KCl·MgCl2·6H2O＋NaCl）, nine univariant curves and four invariant points. The dry salt phase diagram of the system Na^＋, Mg^2＋//Cl^-, NO3 -H2O consists of four crystallization regions （NaNO3, Mg（NO3）2·6H2O, MgCl2·6H2O and NaCl）, five univariant curves and two invariant points.

关 键 词：五元水盐体系 相平衡 物化性质 溶解度 

分 类 号：O642.42[理学—物理化学]