四元体系MgCl_2-MgSO_4-CO(NH_2)_2-H_2O在25℃时的等温溶度  

Isothermal Solubility of Quaternary System MgCl_2-MgSO_4-CO(NH_2)_2-H_2O at 25 ℃:

作　　者：魏小兰[1] 张逢星[2] 郭志箴[2] 李朴[1] 

机构地区：[1]华南理工大学应用化学系,广东广州510640 [2]西北大学化学系,陕西西安710069

出　　处：《华南理工大学学报（自然科学版）》2001年第9期13-16,共4页Journal of South China University of Technology(Natural Science Edition)

摘　　要：测定了四元体系MgCl2 _MgSO4 _CO(NH2 ) 2 _H2 O(不含硫酸盐脱水区 )在 2 5℃时的等温溶度及相应饱和溶液的密度值和折射率 .绘制了该体系的溶度图和性质图 .四元体系做出了 8支共饱线 ,3个四元无变点 .溶度图有 6个单饱和区 ,分别对应CO (NH2 ) 2 ,MgSO4 ·CO (NH2 ) 2 ·2H2 O ,MgCl2 · 4CO (NH2 ) 2 · 2H2 O ,MgCl2 ·CO (NH2 ) 2 · 4H2 O ,MgCl2 ·6H2 O和MgSO4 ·xH2 O(x =4 ,5 ,6,7) .The isothermal solubility and the refraction indexes, densities of saturated solutions in the quaternary system MgCl 2_MgSO 4_CO(NH 2) 2_H 2O(except the regions of dehydrated sulfate)at 25 ℃ have been investigated for the first time. The solubility diagram, property diagrams of the system have been constructed. In the system, eight branch curves and three eutectic points have been determined. In the solubility diagram, there are six crystallization regions corresponding to CO(NH 2) 2,MgSO 4·CO(NH 2) 2·2H 2O,MgCl 2·4CO(NH 2) 2·2H 2O,MgCl 2·CO(NH 2) 2·4H 2O,MgCl 2·6H 2O and MgSO 4· x H 2O( x= 4,5,6,7),respectively for MgCl 2_MgSO 4_CO(NH 2) 2_H 2O system.

关 键 词：四元体系 相平衡 氯化镁 硫酸镁 脲 等温溶度 MgCl2-MgSO4-CO(NH2)2-H2O 

分 类 号：O642.54[理学—物理化学] O642.42[理学—化学]