Abstract: STUDY ON KINETICS OF PYROHYDROLYSIS REACTION OF UF4Kang Shifang Zhao Jun(Chemical Engineering Department,Tianjin University,300072)ABSTRACT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.Key words UF4 Pyrohydrolysis UF6 Deflourine