Continuous method for producing aromatic amines

Details Continuous method for producing aromatic amines Continuous method for producing aromatic amines

C - Chemistry, Metallurgy

07

C

C07C 209/36 (2006.01) C07C 211/50 (2006.01)

Patent

CA 2306935

The invention relates to a continuous method for producing aromatic diamines and/or polyamines by means of catalytic hydrogenation of corresponding aromatic dinitro and/or polynitro compounds with hydrogen. The invention is characterized in that in a reactor with a catalytic fixed bed or shower bed with a pressure ranging from 5 to 100 bar and at a reaction temperature ranging from 100 to 220 ~C, a) the aromatic dinitro and/or polynitro compounds are optionally introduced in the presence of a solvent in a product stream comprised of an essentially recycled hydrogenated product, water and hydrogen, and b) a part of the product stream is continuously withdrawn from the reactor system.

L'invention concerne un procédé continu permettant de préparer des di- et/ou des polyamines aromatiques par hydrogénation catalytique des composés di- et/ou polynitro aromatiques avec de l'hydrogène. Ce procédé se caractérise en ce que dans un réacteur à lit fixe ou à lit coulant catalytique, à une pression comprise entre 5 et 10 bar et à une température de réaction de l'ordre de 100 à 220 ·C, a) les composés di- et/ou polynitro sont introduits éventuellement en présence d'un solvant dans un courant du produit, comprenant un produit d'hydrogénation sensiblement recyclé, de l'eau et de l'hydrogène, et b) une partie du courant du produit est extrait en continu du système de réacteur.

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