A new process for synthesizing atrazine by aqueous method

Abstract

The invention discloses a novel water method synthetic process of atrazine. The novel water method synthetic process specifically comprises the following steps: step one, injecting water into a reaction still, then adding an emulsifier and halate into the reaction still and uniformly stirring to obtain a mixed solution; step two, pumping cold saline into a cooling jacket of the reaction still, stirring, and then throwing cyanuric chloride into the reaction still; step three, uniformly adding isopropylamine into the reaction still; step four, uniformly adding 28 to 40 percent of liquid caustic soda into the reaction still; step five, uniformly adding monoethyl amine into the reaction still; step six, uniformly adding 28 to 40 percent of liquid caustic soda into the reaction still again, and finishing the synthetic reaction. The novel water method synthetic process provided by the invention has the beneficial effects that an aqueous solution in which the emulsifier and the halate are added is used as a solvent for replacing methylbenzene, so the after-treatment working procedure is shortened and the production cost is reduced.

Description

technical field [0001] The invention relates to a synthesis process of herbicides, in particular to a new synthesis process of atrazine by aqueous method. Background technique [0002] The chemical name of atrazine is 2-chloro-4-diethylamino-6-isopropylamino-1,3,5-triazine. Its physical and chemical properties: appearance is white powder, melting point is 173-175℃, The vapor pressure at 20°C is 40μPa, and the solubility in water is 33mg / L. It is easily soluble in organic solvents and relatively stable in slightly acidic or slightly alkaline media. However, at higher temperatures, alkali or inorganic acids can make it hydrolysis. Atrazine is a special herbicide for corn, sugarcane, sorghum, etc. It can control annual grass weeds, especially for broad-leaved weeds. It can be mixed with a variety of amide herbicides such as amines to enhance the activity and application range of herbicides. The industrial production of atrazine uses cyanuric chloride (CN3C13), isopropylamine...

AI Technical Summary

Problems solved by technology

The industrial production of atrazine uses cyanuric chloride (CN3C13), isopropylamine, and monoethylamine as the main raw materials. Atrazine is obtained through a two-step substitution reaction. Among them, cyanuric chloride is insoluble in water and easily decomposes when it meets water and alkali. , in industrial production, if water is simply used as a solvent, cyanuric chloride will decompose with water, resulting in a decrease in the atrazine content and an excessively high impurity content, resulting in a low yield of the product atrazine

Therefore, the synthesis reaction of atrazine uses toluene as a solvent, such as patent number ZL201110339825.2, the invention name is "new synthesis process of atrazine", but when the "synthesis reaction is finished", atrazine toluene is also required The solution is washed with water to remove toluene, and then steam distillation, suction filtration, etc. can be used to obtain the finished product of atrazine wet material. In actual production, the above-mentioned process route is long, and toluene is expensive, high in cost, and has a lot of toxicity and pollution.