Process for separating 4,4'-diaminodiphenylmethane

Details Process for separating 4,4'-diaminodiphenylmethane Process for separating 4,4'-diaminodiphenylmethane

1976-06-04

1980-05-06

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 8526

Patent

active

042017220

ABSTRACT:
A process is described for the isolation of 4,4'-diaminodiphenylmethane in substantially pure form (of the order of 99% purity) from admixtures thereof with the corresponding 2,4'-isomer and 2,2'-isomer. The dihydrochloride of the isomeric mixture of diamines is heated in the presence of an inert organic solvent with a mixture of isomers of the free diamine, in which the amount of the 4,4'-isomer is at least equal to that of the 2,4'-isomer in the dihydrochloride isomeric mixture. The isomeric mixture of the diamines may be employed in the form of a mixture of polymethylene polyphenyl polyamines containing a major portion of said diamines. The reaction product consists of the insoluble dihydrochloride of substantially pure 4,4'-diaminodiphenylmethane and a solution which is enriched in 2,4'-isomer as compared with the starting mixture of diamines.

REFERENCES:
patent: 2149525 (1939-03-01), Jenkins
patent: 2938054 (1960-05-01), Demers, Jr. et al.
patent: 3175007 (1965-03-01), Berhenke
patent: 3996283 (1976-12-01), Knofel
patent: 4029705 (1977-06-01), Sayigh et al.

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