The process of hydrolyzing methyl ethyl ketazine to get hydrazine hydrate under the reactive distillation was studied,and the effects of process conditions and catalysts on the reaction were investigated. Results showed that using the bulk packed tower and the hydrophilic ionic liquid [BMIM]BF_4 as catalyst, under the optimized process conditions of reflux ratio of 4, bottom temperature of 112℃ and stirring speed of 600r/min, the conversion of methyl ethyl ketazine and the selectivity to N2H4 were 92.30%and...