Time: 2018年12月30日 | Visit：
Used in anti-rust oil (fat) products, mainly used in copper and copper alloy gas phase corrosion inhibitor circulating water treatment agent, automobile antifreeze, photographic antifogging agent, polymer stabilizer, plant growth regulator, lubricant additive, ultraviolet absorber, etc.
By adjacent benzene amine react with sodium nitrite. Adding o-phenylendiamine 50 ℃ dissolve in water, adding glacial acetic acid, cooled to 5 ℃, stir in sodium nitrite reaction. The reactants gradually become green, the temperature rose to 70-80 ℃, the solution becomes nacarat, place 2 h at room temperature, cooling, filtering out crystallization, use cold water washing, dry rough, coarse product vacuum distillation, the 201-204 ℃ (2.0 kPa) fractions, reoccupy benzene recrystallization, available product melting point is 96-97 ℃, the yield was about 80%. There was reported with sodium nitrite condensation of carbendazim wastewater treatment and by-products of benzene and three nitrogen Azole.