高等学校化学学报

高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (4): 447.

• 论文 • 上一篇    下一篇

LaCl3-CS(NH2)2-H2O体系的研究

唐宗薰, 郭志箴, 陈佩珩, 马晋华, 陈运生   

  1. 西北大学化学系
  • 收稿日期:1981-04-09 出版日期:1982-12-24 发布日期:1982-12-24

A STUDY ON TERNARY SYSTEM LaCl3-THIOUREA-H2O AT 30℃ AND AT 50℃

Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua, Chen Yunsheng   

  1. Department of Chemistry, Northwestern University, Xian
  • Received:1981-04-09 Online:1982-12-24 Published:1982-12-24

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摘要： 本文报告了以LaCl3·7H2O和LaCl3·3H2O作为原料用溶度法研完LaCl3-CS(NH2)2-H2O体系在30℃和50℃的溶度。体系30℃和50℃的等温溶度图皆为简单共饱型,其溶度曲线由两支组成,分别与CS(NH2)2和LaCL3·7H2O的结晶相对应。30℃时CS(NH2)2的溶度由纯水中的16.83%降到共饱点的6.15%,LaCl3由49.32%降到46.72%,在50℃时则分别由32.46%降到8.98%和51.72%降到48.05%。无论以LaCl3·7H2O或以LaCl3·3H2O为原料平衡所得的点均落在相同的溶度曲线和折光指数-组成(干盐)曲线上。

Abstract: By using the heptahydrate and trihydrate of lathanum trichloride as starting materials, the solubilities and the refractive indices of the saturated solutions in the ternary system LaCl3-CS(NH2)2-H2O have been investigated. The isotherms of solubilities and refractive indices of the system at both 30℃ and 50℃ consist of 2 branches, one corresponding to the saturated solution of LaCl3·7H2O and the other to CS(NH3)2. The solubility data obtained are: LaCl3 - 49.32% and CS(NH2)3 -16.83% at 30℃ and 51.72% and 32.46% at 50° in pure water, respectively. The compositions of the double saturated solutions are: LaCl3 - 46.72%, CS(NH2)2-6.15% at 30℃ and 48.05% and 8.98% at 50℃, respectively.The presence of solid phase, hexahydrated LaCl3 reported by Z. M. Zholalieva et al, in 1978 was not found.

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