FIELD: chemistry.
SUBSTANCE: invention relates to a process for the preparation of a herbicidally active carboxylic acid salt, which comprises steps of: combining a carboxylic acid with a high boiling, water-immiscible organic solvent to form a solution or suspension; treating the solution or suspension obtained in step (I) with a base to form a carboxylic acid salt; removing the solvent from the mixture obtained in step (II) to obtain a carboxylic acid salt cake; and (IV) drying the cake obtained in step (III). Invention also relates to a process for preparing dicamba-sodium, comprising steps of: dissolving a carboxylic acid consisting essentially of dicamba in a high boiling, water-immiscible, inert organic solvent to form a solution or suspension; treating the solution or suspension of dicamba from step (1) with a base selected from sodium hydroxide, sodium bicarbonate, and mixtures thereof in a molar ratio of 1:0.97±0.6 % to form dicamba sodium; centrifuging the reaction mixture from step (2) to obtain a dicamba-sodium salt cake; and drying the dicamba sodium cake prepared in step (3) to obtain dry dicamba-sodium that consistently exhibits a pH between about 7 and 10 when dissolved in water.
EFFECT: method of preparing herbicidal carboxylic acid salts is disclosed.
23 cl, 4 ex
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