Y(HCO_2)_3-HCO_2H-H_2O体系35.0—60.0℃相图

PHASE DIAGRAMS OF Y(HCO_2)_3-HCO_2H-H_2O SYSTEM AT 35.0-60.0℃

测定了Y(HCO_2)_3-HCO_2H-H_2O体系在35.0℃、45.0℃和60.0℃时的等温相图,其中存在着两种固相。前者出现在高酸度区,后者则在低酸度区。两者的溶解度都随着酸度的增加而减少,温度升高时,前者的溶解度几乎不变,而后者的溶解度则递增。Y(HCO_2)_3的相区随着温度的升高而扩大。

This paper studies on isothermal phase diagrams of Y(HCO2)3-HCO2H-H2O system at 35.0℃-60.0℃, there are two solid phases in the system: Y(HCO2)3 is stable at high temperature and high acid concentration; whereas Y(HCO2)3·2H2O at low temperature and low acid concentration. Solubility of the both salts decrease with the increase of acid concentration. With the rise in temperature the solubility of YCHCO2)3·2H2O increases clearly, but that of Y(HCO2)3 slightly. Phase area of Y(HCO2)3 expands with the increase of temperature.