| 摘要 |
<p>The invention relates to a process for preparing mixtures of diphenylmethanediamine and polyphenylenepolymethylenepolyamines, which comprises the steps a) reaction of aniline with formaldehyde in the presence of hydrochloric acid, b) neutralization of the reaction mixture formed in step a) c) separation of the organic phase from the aqueous phase, d) work-up of the organic phase, e) work-up of the aqueous phase, wherein step e) comprises at least the steps e1) extraction of the aqueous phase with an organic solvent, e2) stripping of the aqueous phase obtained in step e1), e3) absorption of the solution obtained from step e2).</p> |
