Method for the continuous production of tetra-substituted ureas

Details Method for the continuous production of tetra-substituted ureas Method for the continuous production of tetra-substituted ureas

C - Chemistry, Metallurgy

07

C

C07C 273/18 (2006.01) C07C 275/06 (2006.01)

Patent

CA 2489408

The invention relates to a method for producing tetra-substituted ureas by reacting the corresponding amines with phosgene in the presence of an aqueous inorganic base at a temperature ranging of from 0 to 150 ~C. According to the inventive method, the corresponding amine, the phosgene and the aqueous inorganic base are on average continuously fed to the reactor, a two-phase system is formed in the reactor by selecting the tetra-substituted ureas to be produced, by selecting the quantitative ratio of the substances and substance mixtures to be added, by selecting the temperature during reaction and optionally by adding an organic solvent that is not completely miscible with water, and the reaction mixture is discharged from the reactor in an on average continuous manner.

L'invention concerne un procédé de production d'urées tétrasubstituées par réaction des amines correspondantes avec du phosgène en présence d'une base inorganique aqueuse à une température comprise entre 0 et 150 ·C. Selon ce procédé, l'amine correspondante, le phosgène et la base inorganique aqueuse sont acheminés en moyenne de façon continue dans le réacteur, un système diphasique est formé dans le réacteur par sélection des urées tétrasubstituées à produire, par définition des rapports quantitatifs des substances et mélanges de substances à acheminer et de la température pendant la réaction et éventuellement par addition d'un solvant organique pas totalement miscible avec l'eau et le mélange réactionnel est évacué en moyenne de façon continue du réacteur.

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