Method For Preparing Hydrazine Hydrate Using An Absorption Column

Abstract: The invention relates to a method for preparing hydrazine hydrate, which comprises the following successive steps: a) preparing, by means of an absorption column, an aqueous solution containing solubilised ammonia and containing at least one activator, by introducing an aqueous solution comprising at least one activator and fresh ammonia into the absorption column; then b) reacting, inside at least one reactor, the aqueous ammonia solution containing at least one activator obtained in the preceding step with hydrogen peroxide and a ketone; then c) separating the azine-containing organic phase of the aqueous phase from the stream formed as a result of the preceding step; and then d) hydrolysing the organic phase obtained in the previous step to obtain hydrazine hydrate.

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