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Synthetic method of acephate

A technology of acephate and synthesis method, applied in the field of machinery, can solve problems such as multiple impurities, and achieve the effect of improving purity

Pending Publication Date: 2021-06-18
湖南沅江赤蜂农化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing preparation method, the catalyst needs to use highly toxic substances such as mercury, and when cooling and crystallizing, most of the condensation nuclei are not acephate, so that after the crystallization of acephate, the interior contains more impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of acephate synthetic method, comprises the steps:

[0019] Step 1. Add arginine ammonia to the reaction kettle, then add the isomerization catalyst, raise the temperature to 60°C, keep it warm for 1h, obtain the post-reaction solution, and then lower it to room temperature; the isomerization catalyst is dimethyl sulfate, dimethyl sulfate The amount added is 0.8‰ of the mass of arginine

[0020] Step 2, add acetic acid and acylation catalyst to the solution after the reaction and heat up to 63° C., and keep it warm for 1 hour; obtain the acephate solution; 2‰ of the mass of arginine; the molar ratio of acetic acid to arginine is 2:1;

[0021] Step 3, cooling the temperature of the acephate solution to 4°C to obtain crystals of acephate;

[0022] Step 4: Grinding the acephate crystals into powder, and then adding the acephate solution in step 2 as crystallization nuclei to obtain pure acephate crystals.

[0023] The yield of acephate obtained in this test was 8...

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PUM

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Abstract

The invention discloses a synthetic method of acephate. According to the invention, a solvent tank, an acephate tank and an acetyl chloride tank are included; the solvent tank, the methamidophos tank and the acetyl chloride tank are respectively communicated with a reaction kettle through communicating pipes; a first valve and a flow meter are mounted on the communicating pipe; the reaction kettle is communicated with a cooling crystallizing tank; the bottom and the top of the cooling crystallizing tank are communicated with each other through a circulating pipe; and a circulating pump and a grinding machine are mounted on the circulating pipe. According to the invention, rapid synthesis of acephate and treatment of tail gas are realized, and the impurities of the product are effectively reduced by taking acephate crystals as condensation nucleuses in a circulating crushing and recrystallization manner.

Description

technical field [0001] The invention belongs to the field of machinery, in particular to a method for synthesizing acephate. Background technique [0002] Acephate is a commonly used pesticide. However, in the existing preparation methods, the catalyst needs to use highly toxic substances such as mercury, and most of the condensation nuclei are not acephate during cooling and crystallization, so that after the crystallization of acephate, the interior contains more impurities. Contents of the invention [0003] In order to solve the above problems, the invention provides a method for synthesizing acephate. The invention adopts a new acylation catalyst to replace the original mercury-containing acylation catalyst, and effectively improves the purity of acephate. [0004] For reaching above-mentioned technical effect, technical scheme of the present invention is: [0005] A kind of acephate synthetic method, comprises the steps: [0006] Step 1. Add arginine to the react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/24
CPCC07F9/2487
Inventor 陈正明
Owner 湖南沅江赤蜂农化有限公司
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