Preparation method of ametryn

Abstract

The invention provides a method for preparing ametryn through a green salt-free technology. The method comprises the following step: under the action of a catalyst, enabling atrazine and methanethiolto react in isopropyl alcohol to prepare the ametryn. According to the method provided by the invention, the production and utilization of sodium thiomethoxide with an offensive odor are avoided; meanwhile, a catalyst with the offensive odor, i.e., trimethylamine hydrochloride, is not used, and the environment-friendly catalyst is used, so that the odor can be avoided radically and the quality ofa product and the environment of a production site are extremely improved; meanwhile, industrial salt is not generated; the method is environmentally friendly and the environment protection cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a preparation method of ametryn. Background technique [0002] Ametrine, chemical name: 2-ethylamino-4-isopropylamino-6-methylthio-1,3,5-triazine, English name: atryn, molecular formula: C 9 h 17 N 5 S, molecular weight: 227.33, chemical formula as follows: [0003] [0004] Its pure product is white crystal, density: 1.19g / m 3 , melting point 84-86°C, vapor pressure at 20°C is 0.112mPa, solubility in water at 25°C is 200mg / L. It is stable in slightly acidic or slightly alkaline medium, but hydrolyzed into 6-hydroxyl derivatives without herbicidal activity in strong acidic or strongly alkaline medium. It can be mixed with most other pesticides and fertilizers when used in normal doses. The compound is non-flammable, non-explosive and non-corrosive. [0005] Ametryn is a selective systemic herbicide with rapid herbicidal action. At a low concentration, arazine can pro...

AI Technical Summary

Problems solved by technology

This method also has obvious deficiencies, mainly because the raw material sodium methyl mercaptide has a bad smell, which makes it difficult to control the smell in the production process and wastewater, and the resulting anrazine product also has an unpleasant smell

At the same time, the trimethylamine hydrochloride catalyst used also has an unpleasant stench, which cannot be removed by physical and chemical methods, resulting in difficult wastewater treatment

In addition, industrial salt sodium chloride is inevitably produced, which has poor environmental protection and high processing costs

[0010] The CN104628666 patent of Runfeng Chemical discloses that atrazine and sodium methyl mercaptide are used as raw materials, and no catalyst is used to synthesize the original drug of atrazine under airtight conditions. Although the problem of difficult odor control in the existing process has been solved, industrial chlorination The problems of sodium and wastewater are still unresolved, with poor environmental protection and high treatment costs

Simultaneously, sodium methyl mercaptide is 20% aqueous solution, and transportation cost is higher

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