after finishing the ammoniation reaction, cooling the materials, taking out the excess liquid ammonia, adding an organic solvent into the reaction kettle, stirring, cooling the materials to 0-5 DEG C, filtering to remove existing crystals, collecting filtrate, evaporating to remove most of the solvent at normal pressure, cooling the materials to 0-5 DEG C again, filtering to remove the crystals in the materials, distilling the filtrate by depressurization and collecting distillates at 42-46 DEG C. A product obtained by the method is an organic intermediate for synthesizing medicines and pesticide.

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