Process for the purification of MDA

Details Process for the purification of MDA Process for the purification of MDA

1975-08-18

1977-06-07

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260248NS, 2605705P, C07C 8516

Patent

active

040283615

ABSTRACT:
A process is described for the selective removal of 2,2'- and 2,4'-diaminodiphenylmethane from mixtures thereof with the corresponding 4,4'-isomer by heating the mixture of isomers in the presence of a 1,3,5-tri-arylhexahydro-1,3,5-triazine and a catalyst (aqueous mineral acid). The process is particularly useful in facilitating the isolation of substantially pure 4,4'-isomer from the aniline-formaldehyde condensation. The pure 4,4'-isomer is a valuable intermediate for polyamides as well as for the corresponding diisocyanate. The by-products of the reaction are oligomeric polymethylene polyphenyl polyamines which are also useful as curing agents and intermediates for polymethylene polyphenyl polyisocyanates and the like.

REFERENCES:
patent: 3676497 (1972-07-01), Recchia et al.
patent: 3857890 (1974-12-01), Recchia et al.
patent: 3860637 (1975-01-01), Bentley
Allied Chemical, "Aniline," p. 35 (1964).

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