Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1992-04-06
1993-03-23
Raymond, Richard L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564333, 564334, C07C20978, C07C20984
Patent
active
051965917
ABSTRACT:
The invention relates to an improved process for the production of polynuclear aromatic polyamines by condensation of aniline with formaldehyde in the presence of water and acidic catalysts and working up of the reaction mixture by extraction with a hydrophobic solvent, the acid catalyst accumulating in the aqueous phase of the extraction step being reused.
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Brockelt Michael
Knofel Hartmut
Petinaux Marcel
Schal Hans-Peter
Uchdorf Rudolf
Bayer Aktiengesellschaft
Gil Joseph C.
Raymond Richard L.
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