Process for reducing impurity levels in methylene diphenyamines

Details Process for reducing impurity levels in methylene diphenyamines Process for reducing impurity levels in methylene diphenyamines

1992-10-09

1994-02-15

Raymond, Richard L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521185, 560347, 560358, 560359, 564330, 564331, 564332, 564333, 564334, C07C26310, C07C26512

Patent

active

052867609

ABSTRACT:
Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine comprising reacting aniline with an aldehyde, in the presence of a low level of an acid wherein the acid level is reduced before digesting reaction mixture at a high temperature which is sufficient to effect a rearrangement of the intermediates to produce a reaction product containing methylene diphenylamines and low levels of impurities.

REFERENCES:
patent: 3644232 (1972-02-01), Bernard et al.
patent: 4094907 (1978-06-01), Knofel et al.
patent: 4259526 (1981-03-01), Dunlap et al.
patent: 4465639 (1984-08-01), Hatfield, Jr.
patent: 4792624 (1988-12-01), Hatfield, Jr. et al.
patent: 4952611 (1990-08-01), Indyke

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