三元体系RECl_3（RE＝Dy，Yb）－HOAc－H_2O（30℃）的研究

Phase System RECl_3-HOAc-H_2O(30℃) (RE=Dy,Yb)

测定了三元体系ＲＥＣｌ３（ＲＥ＝Ｄｙ，Ｙｂ）－ＨＯＡｃ－Ｈ２Ｏ（３０℃）的平衡态的溶度数据并绘制了相应的溶度图。在两个体系中分别得到了ＤｙＣｌ３·６Ｈ２Ｏ和ＹｂＣｌ３·６Ｈ２Ｏ两种固相。依据ＨＯＡｃ对ＤｙＣｌ３·６Ｈ２Ｏ和ＹｂＣｌ３·６Ｈ２Ｏ有盐抗作用这一结论得到了一种制备ＤｙＣｌ３·６Ｈ２Ｏ和ＹｂＣｌ３·６Ｈ２Ｏ的ＨＣｌ—ＨＯＡｃ法。同时，在分析测定酸的重量百分浓度时，利用“差减法”得到了Ｈ＋的准确含量。

The solubilities of saturated solution of ternary system RECl3(RE=Dy, Yb)-HOAc-H2O(30℃)have been investigated and the corresponding equilibrium diagrams were constructed. Two compounds DyCl3· 6H2O and YbCl3·6H2O were obtained. The Salting out effect of HOAc to DyCl3· 6H2O and YbCl3·6H2O indicates that HCl-HOAC method can be used to prepare DyCl3· 6H2O and YbCl3· 6H2O. The subtraction method was used to get the precise content of H+ of HOAc.