IMPROVED PROCESS FOR THE PREPARATION OF HYDRAZINE HYDRATE WITH PYRAZOLINE RECYCLING

摘要

The present invention relates to an improved process for the preparation of hydrazine hydrate from the azine of methyl ethyl ketone obtained from methyl ethyl ketone by oxidation of ammonia with hydrogen peroxide in the presence of a activator, characterized in that it comprises a step of recycling the purge of the heterocycles of the pyrazoline family.