高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (8): 1172.

• 论文 • 上一篇    下一篇

LaCl3·3H2O-18C6-C2H5OH体系(25℃)的相平衡研究及

李谦定1, 薛鸿福2, 任德厚2   

  1. 1. 西安石油学院化工系, 西安, 710061;
    2. 西北大学化学系
  • 收稿日期:1994-11-09 修回日期:1995-04-10 出版日期:1995-08-24 发布日期:1995-08-24
  • 通讯作者: 李谦定,男,36岁,讲师.
  • 作者简介:李谦定,男,36岁,讲师.

Studies on Phase Equilibrium of LaCl3·3H2O-18C6-C2H5OH System at 25℃ and Synthesis and Characterization of Solid Coordination Compounds

LI Qian-Ding1, XUE Hong-Fu2, REN De-Hou2   

  1. 1. Department of Chemical Engineering, Xi'an Petroleum Institute, Xi'an, 710061;
    2. Department of Chemistry, Northwest University, Xi'an, 710069
  • Received:1994-11-09 Revised:1995-04-10 Online:1995-08-24 Published:1995-08-24

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摘要： 采用半微量相平衡方法研究了LaCl3·3H2O-18C6-C2H5OH三元体系在25℃时的溶解度,测定了各饱和溶液的折光率。结果表明:该体系在25℃时形成了3种化学计量的配合物,组成分别为LaCl3·18C6·3H2O·2LaCl3·18C6·6H2O·C2H5OH及3LaCl3·18C6·9H2O·C2H5OH.考察了相平衡过程中水的行为,结果表明:无论在液相还是在固相中,H2O/LaCl3的摩尔比总是3:1.制备了固态配合物,用IR、DTG、TG与DSC研究了配合物的组成与性质。由DSC得到配合物不同分解步骤的焓变。

关键词: 三水氯化镧, 冠醚18C6, 配合物, 溶解度, 相平衡

Abstract: The solubilities of LaCl3·3H2O-18C6-C2H5OH ternary system at 25℃ were investigated by a semimicro method of phase equilibrium study,and the refractive indexes of saturated solutions were determined.The results indicate that there are three kinds of complexes formed in this system,namely,3LaCl3·18C6·9H2O·C2H5OH,2LaCl3·18C6·6H2O·C2H5OH and LaCl3·18C6·3H2O. The behavior of water in this system during the equilibrium was examined and the results show that the mole ratio,H2O/LaCl3,is always 3:1,no matter it is in liquid or solid phase.Three solid complexes were prepared and characterized by IRspectra,DTG,TG and DSC. According to the DSC,the enthalpies of some steps during the decomposition were obtained for these three complexes.

Key words: Trihydrated lanthanum chloride, Crown ether 18C6, Complex, Solubility, Phase equilibrium

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