In order to select high activity catalysts for urea hydrolysis

the kinetic and thermodynamic characteristics of urea catalytic hydrolysis reaction were studied by using batch reactor and continuous operation pilot plant

and the effects of different catalysts on hydrolysis reaction temperature

energy consumption and variable load response time were compared. The results show that

the activation energy of the hydrolysis reaction can be reduced by adding catalyst(the activation energy of the liquid diammonium hydrogen phosphate is 65.3 kJ/mol

and that of the solid alumina is 52.9 kJ/mol)

and the urea conversion can be improved. The addition of catalyst increases the hydrolysis reaction rate and decreases the hydrolysis reaction temperature. Due to uneven distribution and insufficient contact

the catalytic activity of solid alumina catalyst decreases in the continuous operation reactor.The energy consumption of ammonia production by catalytic hydrolysis is about 1%～3% lower than that of ordinary hydrolysis

and the response time of hydrolyzer changing load is not shortened by adding diammonium phosphate and alumina catalyst.