| 摘要 |
<p>The invention concerns an improved method for making hydrazine hydrate, characterized by the following steps: a) in a reaction medium, oxidizing ammonia in aqueous solution in the presence of pivalone with sodium hypochlorite or with hydrogen peroxide associated with an activating agent to obtain pivalone hydrazone; b) when the reaction is completed, separating an organic phase consisting essentially of pivalone hydrazone from aqueous phase containing sodium chloride or the hydrogen peroxide activating agent, c) hydrolyzing the organic phase consisting essentially of pivalone hydrazone to obtain hydrazine hydrate in aqueous solution and pivalone and recycling to step a) the pivalone obtained at step c).</p> |
