| abstract |
Disclosed is a process for preparing a herbic acid salt having a herbicidal activity, which comprises the steps of: i) mixing a carboxylic acid with a high boiling point, water immiscible organic solvent to obtain a solution or slurry; ii) in step (i) The resulting solution or slurry is added with a base to form a carboxylate; iii) the solvent in the mixture produced in step (ii) is removed to obtain a carboxylate cake; and v) the cake obtained in the drying step (iii) is dried.nThis method is especially suitable for the preparation of dicamba salts. A method for preparing dicamba-sodium comprises: (1) dissolving a carboxylic acid substantially composed of dicamba in a high-boiling, water-immiscible inert organic solvent to obtain a solution or slurry; and (2) oxidizing Selecting a base from sodium, sodium bicarbonate and a mixture thereof, adding the dicamba solution or slurry of step 1 according to a molar ratio of 1:0.97±0.6% to form dicamba-sodium; (3) the step 2 The reaction mixture is centrifuged to obtain a dicamba-sodium salt cake; and (4) the dicamba-sodium cake obtained in the drying step 3 is obtained to obtain dried dicamba-sodium, and the pH after dissolution in water is always between 7 and 10 or so. |