Method for the continuous synthesis of monoalkyl-hydrazines...

Details Method for the continuous synthesis of monoalkyl-hydrazines... Method for the continuous synthesis of monoalkyl-hydrazines...

C - Chemistry, Metallurgy

07

C

C07C 243/16 (2006.01)

Patent

CA 2550076

The invention relates to a method for the continuous synthesis of monoalkyl-hydrazines with a functionalised alkyl group. The inventive method is characterised in that it comprises a step consisting in demixing a solution containing the synthesised monoalkyl-hydrazine, by reacting an anhydrous amine with monochloramine, in an organic phase and an aqueous phase with the addition of anhydrous sodium hydroxide. The invention can be used to obtain perfect selectivity in relation to monoalkyl-hydrazine without the presence of the di- and tri-substituted forms thereof. According to the invention, the starting amine which has not reacted is collected and reused directly without any additional treatment.

La présente invention concerne un procédé de synthèse en continu de monoalkyl~hydrazines à groupe alkyle fonctionnalisé. Le procédé se caractérise en ce qu'il comprend une étape de démixtion la solution comprenant la monoalkyl-hydrazine synthétisée, par réaction d'une amine anhydre avec de la monochloramine, en une phase organique et une phase aqueuse par l'ajout d'hydroxyde de sodium anhydre. Le procédé mis au point permet d'obtenir une parfaite sélectivité au niveau de la monoalkyl~hydrazine sans la présence de ses formes di- et tri- substituées. L'amine de départ qui n'a pas réagi est récupérée et réutilisée directement, sans traitement supplémentaire.

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