高等学校化学学报

高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (9): 1449.

• 论文 • 上一篇    下一篇

三元体系MgCl2-CO(NH2)2-H2O在25℃时的等温溶度与新相研究

张逢星1, 魏小兰2, 郭志箴1, 史启祯1   

  1. 1. 西北大学化学系, 西安, 710069;
    2. 华南理工大学应用化学系, 广州, 510641
  • 收稿日期:1997-06-11 出版日期:1998-09-24 发布日期:1998-09-24
  • 通讯作者: 张逢星,男,42岁,硕士.副教授.
  • 作者简介:张逢星,男,42岁,硕士.副教授.
  • 基金资助:

    陕西省教委专项科研基金(批准号:95JK012)资助课题.

Studies on the Isothermal Solubility and the New Phases in the Ternary System MgCl2 CO(NH2)2 H2O at 25 ℃

ZHANG Feng-Xing1, WEI Xiao-Lan2, GUO Zhi-Zhen1, SHI Qi-Zhen1   

  1. 1. Department of Chemistry, Northwest University, Xi'an, 710069;
    2. South China University of Science & Technology, Guangzhou, 510641
  • Received:1997-06-11 Online:1998-09-24 Published:1998-09-24

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摘要： 测定了25℃时三元体系MgCl2-CO(NH2)2-H2O的等温溶度及饱和溶液的折光率和密度,且绘制成溶度图和性质-组成图.在三元体系内形成2个三元化合物新相:MgCl2·CO(NH2)2·4H2O(记作A)和Mgcl2·4CO(NH2)2·2H2O(记作B),B为新化合物.三元体系的溶度图由4支单饱和线[对应单饱和固相为MgCl2·6H2O、三元化合物A和B、CO(NH2)2]组成,这4支单饱和线两两交于3个三元无变点[对应双饱和固相为MgCl2·6H2O+A、A+B、B+CO(NH2)2].

关键词: 三元体系, 相平衡, 氯化钾, 氯化镁, 脲

Abstract: The solubilities and refractive indices, densities of the saturated solutions in the title ternary system have been investigated isothermally at 25 ℃. In the ternary system, there are two new phases being formed, MgCl2·CO(NH2)2·4H2O(compound A) and MgCl2·4CO(NH2)2·2H2O(compound B). Compound Bis found for the first time. The two compounds are characterized by IRspectra, DTA, DSC, X-Ray diffraction etc. The solubility diagram is consisted of four crystallization surfaces corresponding to MgCl2·6H2O, ternary compounds A, Band CO(NH2)2, and three invariant points corresponding to the eutectic solutions saturated with MgCl2·6H2O+A, A+B, B+CO(NH2)2.

Key words: Ternary system, Phase equilibrium, Potassium chloride, Magnesium chloride, Urea

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