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A method for synthesizing diquat

A technology of diquat and water agent, applied in the field of herbicide synthesis technology, can solve the problems of high production cost, low reaction yield, cumbersome process flow, etc., and achieve low production cost, simple process and high reaction yield Effect

Active Publication Date: 2015-11-25
ANHUI COSTAR BIOCHEM CO LTD
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Problems solved by technology

However, this method is very complicated from the synthesis of raw material 2,2'-bipyridine to the cyclization of 2,2'-bipyridine and dibromoethane. At the same time, the reaction yield is low and the production cost is high. Influencing Factors Restricting the Popularization of Diquat Synthesis Technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for synthesizing diquat, the specific steps are as follows:

[0024] (1) Coupling: Add 2-chloropyridine, solvent DMAC, catalyst triphenylphosphine, zinc powder, nickel chloride, and diffusion agent MF into the reaction kettle in sequence, heat up to 70°C, and keep the temperature for 2 hours; continue to heat up to 90°C -100°C, heat preservation for 2 hours; then sample analysis, wherein the mass ratio of 2-chloropyridine:solvent DMAC:catalyst triphenylphosphine:zinc powder:nickel chloride, diffusion agent MF=125:300:75:60: 5:3;

[0025] (2) Precipitation: Step (1) After sampling and analysis, when the content of 2-chloropyridine is less than 0.5%, the reaction ends, the temperature is controlled at 120-130°C, and the solvent DMAC is removed under reduced pressure to obtain a solid substance;

[0026] (3) Alkaline hydrolysis: add 12% sodium hydroxide solution and ammonium bicarbonate to the solid substance obtained in step (2) and heat up to 70-75°C, and perfo...

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Abstract

The invention discloses a method for synthesizing aquacide, which is mainly characterized in that an aquacide aqueous solution is prepared by the steps of coupling, carrying out alkaline hydrolysis, extracting, carrying out alkaline hydrolysis, cyclizing, extracting, decolouring and the like. The method for synthesizing the aquacide disclosed by the invention has the advantages of being simple in whole technological process, high in reaction yield, low in production cost and environment-friendly.

Description

technical field [0001] The invention relates to a synthesis process of herbicide, in particular to a method for synthesizing diquat. Background technique [0002] Diquat is a non-selective contact herbicide and desiccant developed by British Syngenta Chemical Company. It is one of the most widely used herbicide products in the world. Glyphosate and Paraquat. [0003] Diquat generally exists in the form of dibromide monohydrate, and the commercially available diquat preparations are generally 20% aqueous formulations. [0004] The traditional method of preparing diquat is to co-heat the main raw materials 2,2'-bipyridine and dibromoethane. However, this method is very complicated from the synthesis of raw material 2,2'-bipyridine to the cyclization of 2,2'-bipyridine and dibromoethane. At the same time, the reaction yield is low and the production cost is high. Influencing factors restricting the popularization of diquat synthesis process. [0005] In order to increase th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D471/14A01N43/90A01P13/00
Inventor 刘善和葛九敢王红明顾福海
Owner ANHUI COSTAR BIOCHEM CO LTD
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