Production Process Of Diuron

  • Author:Hubei Ocean Biotech Co,.LTd
  • Release on :2016-05-04

A certain amount of molten dewatered chloronitrobenzene with the appropriate amount of anhydrous FeCl3 catalyst mixture, temperature was raised to 100 ~ 105 ℃, chlorine begins, chlorination temperature 100 ~ 110 ℃, 8 ~ 9h reaction obtained 3,4 chloronitrobenzene.
The above-mentioned reduction of nitro compounds to prepare 3,4-dichloroaniline.
At present, there is a method using iron powder and water to restore production in the electrolyte. Procedure: water, iron powder, a small amount of hydrochloric acid, ammonium chloride, and copper sulfate electrolyte measurement, the temperature was raised to 95 ~ 100 ℃, a solution of 2,4-dichloro-nitrobenzene, and kept at reflux (105 ~ 110 ℃) reaction 3h, filtered, dehydrated 3,4-dichloro-aniline.
The toluene solution of phosgene at 0 ℃ saturated, then a solution of 3,4-dichloro-aniline, control 0 ~ 10 ℃, about 15min plus complete, followed by continuously feeding phosgene, slowly increasing the reaction temperature to 40 ℃, increase phosgene flow, then heated to 65 ~ 75 ℃, reaction 1 ~ 2h, the material becomes clear, stop phosgene, quickly warmed to 90 ~ 100 ℃, nitrogen or dry air, get rid of the excess phosgene and hydrochloric acid gas to give 3 , 4-dichloro-phenyl isocyanate in toluene.
3,4-dichloro-phenyl isocyanate, toluene and cooled to less 20 ℃, dropping 30% -40% aqueous solution of dimethylamine (ester amine ratio of 1: 1.05), the temperature rose to their own 34 ℃, not control Chaoguo 50 ℃, dropping around about the end of PH 9-10, 15 ℃ for 2.5 hours and then centrifugal filtration, solvent recovery filter cake washed neutral after 90 ~ 100 ℃ dried to obtain diuron.
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