Purification of methylenedianilines

Details Purification of methylenedianilines Purification of methylenedianilines

1976-05-28

1977-07-05

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453AM, C07C 8720

Patent

active

040340392

ABSTRACT:
A process is described for the isolation of 4,4'-diaminodiphenylmethane in substantially pure form (of the order of purity of at least 95%) from admixtures thereof with the corresponding 2,4'-isomer and 2,2'-isomer. The isomeric mixture of diamines is heated, optionally in the presence of an inert organic solvent, with at least two equivalents, per mole of said diamine mixture, of a phenol or bisalkylidenephenol. The 4,4'-diaminodiphenylmethane forms a complex with said phenol and the 4,4'-isomer of the diamine is isolated therefrom in substantially pure form by treatment with alkali or by heating to dissociate. The isomeric mixture of diamines used as starting material can be employed in the form of a mixture of polymethylene polyphenyl polyamines containing a major portion of said diamines.

REFERENCES:
patent: 3542871 (1970-11-01), Thompson

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