Process for the preparation of aromatic polyamines

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

C - Chemistry, Metallurgy

08

G

260/597.8

C08G 12/08 (2006.01)

Patent

CA 1056856

PROCESS FOR THE PREPARATION OF AROMATIC POLYAMINES ABSTRACT OF THE DISCLOSURE The instant invention is directed to a novel process for the production of aromatic polyamines. In one embodiment, the process comprises (A) condensing an aromatic amine with formalde- hyde in the presence of a hydrophobic solvent and in the absence of an acid catalyst to produce a precondensate mix- ture containing the corresponding N,N'-disubstituted aminals, (B) removing substantially all the water from said precondensate mixture to produce a first organic phase, (C) mixing said first organic phase with an aqueous solution containing an acid catalyst thereby pro- ducing a first two-phase mixture, (D) subjecting said first two-phase mixture to a first rearrangement reaction wherein a mono-N-substituted aminal is formed and wherein a second two-phase mixture is produced, (E) separating said second two-phase mixture into a second organic phase and a first aqueous phase, (F) subjecting said first aqueous phase to at least one more rearrangement reaction thereby producing an aqueous condensation mixture containing said aromatic poly- amines, (G) extracting said aqueous condensation mixture

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