Process for the preparation of polyamines

Details Process for the preparation of polyamines Process for the preparation of polyamines

C - Chemistry, Metallurgy

08

G

260/597.5

C08G 8/16 (2006.01) C08G 12/08 (2006.01) C08G 73/02 (2006.01)

Patent

CA 1084067

PROCESS FOR THE PREPARATION OF POLYAMINES ABSTRACT OF THE DISCLOSURE The instant invention is directed to a process for the preparation of multinuclear aromatic polyamines by conden- sation of aromatic amines with formaldehyde in the presence of aqueous acid catalysts followed by neutralization of the catalyst and processing of the resulting reaction mixture in known manner, characterized in that free amine is removed from the reaction mixture leaving the last condensation stage by means of a hydrophobic solvent, optionally after partial neutraliza- tion of the catalyst but before neutralization of the total quan- tity of catalyst put into the process, and the amine thus removed is returned to the catalyst-containing aqueous phase by return of the resulting amine-containing solvent phase into said aqueous, catalyst-containing phase at any point before the last condensa- tion stage.

267716

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