Production method of pendimethalin

The invention provides a production method of pendimethalin, which comprises the following steps: S1) carrying out salt forming reaction on N-(1-ethyl propyl)-3, 4-dimethylaniline and nitric acid to obtain a salt solution; s2) performing phase separation on the salt solution to obtain a first oil phase and a first water phase; s3) carrying out nitration reaction on the first oil phase and nitric acid to obtain reaction liquid; s4) performing phase splitting on the reaction liquid to obtain a second oil phase and a second water phase; s5) washing the second oil phase with water, and performing phase splitting again to obtain a third oil phase and a third water phase; and S6) carrying out nitrite removal treatment on the third oil phase to obtain the pendimethalin. According to the production method of the pendimethalin provided by the invention, the industrial continuous production of the pendimethalin can be realized, and the utilization rate of nitric acid is improved. 本发明提供了一种二甲戊灵的生产方法，包括以下步骤：S1)将N-(1-乙基丙基)