Method for preparing methyl carbazate

Details Method for preparing methyl carbazate Method for preparing methyl carbazate

C - Chemistry, Metallurgy

07

C

C07C 281/02 (2006.01)

Patent

CA 2361423

Especially pure methyl carbazate with a particularly low tendency to discoloration is obtained from hydrazine and dimethyl carbonate by simultaneous addition of the two reactants to a first solvent at between -20 and +30 ~C, removal of the solvent and light-boiling components by distillation at reduced pressure, and either addition of a second solvent to the resulting crude methyl carbazate and removal of said solvent by distillation or passing of an inert gas through said crude methyl carbazate.

L'invention concerne un procédé permettant de préparer du carbazate de méthyle particulièrement pur et peu enclin à l'altération des couleurs, à partir d'hydrazine et de carbonate de diméthyle. Selon ce procédé, on introduit de manière dosée les deux réactifs simultanément à une température comprise entre -20 et + 30 ·C dans un premier solvant. Ledit solvant et les fractions à bas point d'ébullition sont ensuite éliminés par distillation, à pression réduite. Ensuite, on ajoute au carbazate de méthyle brut obtenu un second solvant qu'on élimine par distillation, ou on fait passer un gaz inerte à travers.

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