Patent ID: 9416094
Filing Date: 2016-08-16
CPC Classification: C07C

Claim Text:
1. A process for the preparation of di- and polyamines of the diphenylmethane series, comprising: a) reacting aniline and formaldehyde in the presence of an acidic catalyst to give a reaction mixture comprising di- and polyamines of the diphenylmethane series, b) neutralizing the reaction mixture comprising di- and polyamines of the diphenylmethane series, c) separating the neutralized reaction mixture comprising di- and polyamines of the diphenylmethane series in a separation container into an organic phase (1) comprising di- and polyamines of the diphenylmethane series and an aqueous phase, d) further purifying the organic phase (1) comprising di- and polyamines of the diphenylmethane series in a washing container with washing liquid, e) freeing the mixture obtained in step d) from aqueous constituents, giving an organic phase (2) comprising di- and polyamines of the diphenylmethane series, and f) freeing the organic phase (2) comprising di- and polyamines of the diphenylmethane series distillatively from water and aniline, wherein the freeing of the aqueous constituents in step e) comprises: