UF_4水解反应动力学研究

STUDY ON KINETICS OF PYROHYDROLYSIS REACTION OF UF 4

在Ｈ２－Ｈ２Ｏ混合气流下研究了由ＵＦ６经催化氢还原制得ＵＦ４的水解反应动力学。结果表明，ＵＦ４水解反应服从相界面反应速度定律，并测得其水解反应的表观活化能为４９．２ｋＪ／ｍｏｌ。实验还发现，水解气中水分压随着温度的升高对水解反应的影响显著增加。与其他方法制备的ＵＦ４的水解反应性能做比较发现，ＵＦ６催化氢还原所得ＵＦ４有较好的反应性能，而且在较低的温度下也有较好的脱氟效果。在０．０５２ＭＰａ水分压及５２０℃下经３０ｍｉｎ水解，产物中的氟含量可降至６．１×１０－５。

The pyrohydrolysis of UF 4 producted by catalysis hydrogen reduction of UF 6 is studied in H 2 steam mixture gases. The results show that the pyrohydrolysis of UF 4 obeys the phase boundary rate law and has an activitition energy of 49.2 kJ/mol. The water partial pressure in H 2 steam mixture gases effects more on reaction rate of UF 4 pyrohydrolysis at higher temperature. The experimental results also show that this UF 4 has higher reaction rate than the UF 4 producted by other methods.The UF 4 produced by catalysis hydrogen reduction of UF 6 is deflourined easily at lower temperature.