| 摘要 |
<p>Mo-1669-G PU-010 IMPROVED PROCESS FOR THE PRODUCTION OF MULTI-NUCLEAR AROMATIC POLYAMINES The instant invention is directed to an improved process for the production of multi-nuclear aromatic polyamines comprising: (A) pre-condensing an aromatic amine with formaldehyde in the presence of an aqueous acid catalyst at a temperature of less than about 60.degree.C, to obtain a precondensation mixture, (B) subjecting said precondensation mixture to a final condensation reaction at a temperature greater than about -60.degree.C, thereby obtaining an acidic condensation mixture containing said aromatic polyamines and said acid catalyst, (C) returning a portion of said acidic condensation mixture to step (A), and (D) recovering said aromatic polyamine from the remaining portion of said acidic condensation mixture. PU-010</p> |
