Process for the production of polyamines

Details Process for the production of polyamines Process for the production of polyamines

1974-11-27

1977-05-24

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 85145

Patent

active

040255573

ABSTRACT:
A process for condensing aromatic amines with formaldehyde in the presence of water is disclosed whereby an inhomogeneous mixture of a reaction product containing a large amount of 4,4'-diamino diphenylmethane is obtained which inhomogenity is due to a large quantity of water which is either present at the beginning of the condensation reaction or which if the reaction is carried out in the presence of relatively small amounts of water is obtained by the subsequent addition of water. The two phases are separated into an organic phase which is directly worked up by distillation without the necessity of an alkaline treatment. The aqueous phase is recycled to the beginning of the process. The process has the advantage of elimination of a salt free effluent, no consumption of acid catalyst and elimination of the need for alkaline reagents.

REFERENCES:
patent: 1803331 (1931-05-01), Kladivko
patent: 1954484 (1934-04-01), Mattison
patent: 3175007 (1965-03-01), Berhenke
patent: 3358025 (1967-12-01), Foster et al.

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