| abstract |
There are herein disclosed a process for continuously and stably synthesizing a ketazine from hydrogen peroxide, ammonia and methyl ethyl ketone in the presence of a working solution containing a catalyst, said process comprising a step of removing sec-butyl alcohol by distillation from methyl ethyl ketone which is reused by circulation, and a process for preparing a hydrazine hydrate which comprises the step of hydrolyzing this ketazine. n According to the present invention, while unreacted ketone is circulated, the accumulation of impurities in the circulated ketone can be prevented to maintain the yield of the ketazine and the yield of the hydrazine hydrate at a high level for a long period of time. |