Process for the preparation of polyamines

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

1976-12-17

1978-06-13

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2605709, 560 19, C07C 8524

Patent

active

040949079

ABSTRACT:
The instant invention is directed to a process for the preparation of multinuclear aromatic polyamines by condensation 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 neutralization of the catalyst but before neutralization of the total quantity 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 condensation stage.

REFERENCES:
patent: 3478099 (1969-11-01), Ross et al.
patent: 3931320 (1976-01-01), Eifler et al.
patent: 3952042 (1976-04-01), Knofel
patent: 3996283 (1976-12-01), Knofel
patent: 4014914 (1977-03-01), Pistor et al.

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