PROCESS FOR THE PRODUCTION OF DI- AND POLYAMINES OF THE DIPHENYLMETHANE SERIES

摘要

(A) reacting aniline with formaldehyde in the presence of an acid catalyst to produce a reaction mixture containing diamines and polyamines; (b) neutralizing a reaction mixture containing a diamine and a polyamine; (c) separating the neutralized reaction mixture into an organic phase containing an amine and a polyamine and an aqueous phase; (d) washing the organic phase separated in step (c) with (d1) water, (d2) separating the washed mixture into an organic phase and an aqueous phase, (d3) further separating the organic phase, Producing purified diamines and polyamines on the one hand and aniline / water on the other; (e) washing the aqueous phase separated in step (c) with (e1) aniline, (e2) separating the washed mixture into an aqueous phase and an organic phase, and (e3) And leaving the effluent stream; (A) removing a portion of the water from the neutralized reaction mixture obtained in step (b) or the aqueous phase separated in step (c), (B) ) Adding an inorganic salt to the neutralized reaction mixture obtained in step (b) or the aqueous phase separated in step (c), and (C) part of the aqueous phase obtained in step (e2) ), Or recycling to the washed mixture of step (e1), either alone or in combination with one or more other methods, Diaminodiphenylmethane). /RTI