Process for preparing hydrazine hydrate in the presence of an anti-foaming agent
OwnerJean-Marc SAGE, Emmanuel ACHARDinventors
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Abstract
The invention relates to a process for preparing hydrazine hydrate, comprising a step of hydrolyzing an azine in a distillation column in the presence of at least one silicone of the polydialkylsiloxane, polydiarylsiloxane or polyalkyl-arylsiloxane formula. The invention also relates to the use of at least one silicone of the polydialkylsiloxane formula as an anti-foaming agent in a process for preparing azine hydrate.
Claims13
A process for preparing hydrazine hydrate, comprising a step of hydrolyzing an azine in a distillation column in the presence of at least one silicone of the polydialkylsiloxane, polydiarylsiloxane or polyalkyl-arylsiloxane formula.
The process according to any one of the preceding claims, characterized in that the silicone is a polydimethylsiloxane.
The process according to any one of the preceding claims, characterized in that the silicone is in the form of an aqueous emulsion.
The process according to any one of the preceding claims, characterized in that the silicone is introduced at the head of the distillation column, with the water introduced into the column for hydrolysis.
The process according to any one of the preceding claims, characterized in that the silicone is introduced in a content ranging from 1 ppm to 5000 ppm by weight relative to the azine, preferably between 5 ppm and 4000 ppm by weight relative to the azine.
The process according to any one of the preceding claims, characterized in that the azine is methyl ethyl ketone azine or dimethyl ketone azine, preferably the azine is methyl ethyl ketone azine.
The process according to any one of the preceding claims, characterized in that the process comprises:
- a step of reacting ammonia, hydrogen peroxide and ketone in the presence of a solution comprising at least one activator to form an azine in a working solution, prior to the hydrolysis step defined in the preceding claims.
Dependencies are inferred from the claim text.