Process for purifying dinitroaniline herbicides

Details Process for purifying dinitroaniline herbicides Process for purifying dinitroaniline herbicides

1987-06-15

1990-11-13

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564 5, C07C20984, C07C20990

Patent

active

049703439

ABSTRACT:
A one-step process for the preparation of nitrosamine-free dinitroaniline herbicides which involves contacting the crude dinitroaniline herbicide in the liquid state, after removal of excess amine, with an effective quantity of a hydrobromide salt of a p-amino benzoate ester, optionally in the presence of such an ester, passing a gaseous stream of air therethrough or applying a reduced pressure so as to essentially remove water present, resulting in an essentially nitrosamine-free product.

REFERENCES:
patent: 4127610 (1978-11-01), Eizenber
patent: 4331468 (1982-05-01), Williams
patent: 4537992 (1985-08-01), Pikarski et al.

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