Process for purifying dinitroaniline herbicides

Details Process for purifying dinitroaniline herbicides Process for purifying dinitroaniline herbicides

C - Chemistry, Metallurgy

07

C

260/612.3, 260/5

C07C 209/84 (2006.01) A01N 33/06 (2006.01) A01N 33/18 (2006.01) C07C 209/90 (2006.01) C07C 211/52 (2006.01)

Patent

CA 1304754

A B S T R A C T 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.

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