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Method for increasing yield of produced methomyl

A technology for the yield of methomyl and carboxyl, which is applied in the direction of organic chemistry, can solve the problems of large pollutant discharge and low yield of chemical synthesis reactions, and achieve the effects of reducing emissions, low cost, and environmental protection

Inactive Publication Date: 2015-04-22
安道麦股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, methomyl has a certain water solubility. During the production process, due to the dissolution of methomyl in water, the yield of the chemical synthesis reaction is not high, and the amount of pollutant discharge is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The methomyl aqueous solution is prepared by the reaction of methomyl and methyl isocyanate. After the reaction is completed, activated carbon is added to absorb impurities, and then the temperature of the methomyl aqueous solution is controlled at 5°C with ice salt water, and NaCl is added to precipitate the methomyl, and then filtered. The filtrate after recovery continues to be added in the methomyl aqueous solution as NaCl. The filtered solid was first recrystallized and then dried to obtain methomyl, and the yield increased from 90% to 93%.

Embodiment 2

[0013] The methomyl aqueous solution was prepared by the reaction of methomyl and methyl isocyanate. After the reaction was completed, activated carbon was added to absorb impurities, and then the temperature of the methomyl aqueous solution was controlled at 10°C with ice salt water, and NaCl was added to precipitate the methomyl, and then filtered. The filtrate after recovery continues to be added in the methomyl aqueous solution as NaCl. The filtered solid was first recrystallized and then dried to obtain methomyl, and the yield increased from 88% to 92%.

Embodiment 3

[0015] The methomyl aqueous solution was prepared by the reaction of methomyl and methyl isocyanate. After the reaction was completed, activated carbon was added to absorb impurities, and then the temperature of the methomyl aqueous solution was controlled at 8°C with ice-salt water, and NaCl was added to precipitate the methomyl, and then filtered. The filtrate after recovery continues to be added in the methomyl aqueous solution as NaCl. The filtered solid was first recrystallized and then dried to obtain methomyl, and the yield increased from 90% to 92%.

[0016] The purity of the methomyl prepared by the method of the invention can reach more than 98%, and the methomyl in the methomyl aqueous solution is fully recovered, thereby improving the yield. At the same time, the pollution of waste water is reduced, which is beneficial to environmental protection and has strong practicability.

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PUM

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Abstract

The invention provides a method for increasing yield of produced methomyl. The method comprises the steps of reacting by virtue of methomyl oxime and methyl isocyanate to prepare a methomyl water solution; after the reaction is finished and the temperature of the methomyl water solution is controlled to 5-10 DEG C, adding NaCl to separate methomyl, and filtering, so as to obtain solid methomyl. According to the method, methomyl in the water solution is seperated by virtue of a salting-out method, so that the yield of methomyl is increased, furthermore, the emission load of pollutants in wastewater is reduced, and the environment is protected. The method is easy, the cost is low; furthermore, an obtained methomyl product is high in purity, good in quality and has very high practicability.

Description

technical field [0001] The invention relates to the field of pesticide production methods, in particular to a method for increasing the yield of methomyl. Background technique [0002] The method of domestic production of methomyl is generally to use methomyl to react with isoesters to directly synthesize the target product methomyl. However, methomyl has a certain water solubility. During the production process, due to the dissolution of methomyl in water, the yield of the chemical synthesis reaction is not high, and the amount of pollutant discharge is large. Contents of the invention [0003] The purpose of the present invention is to provide a kind of method that improves the yield of producing methomyl according to the deficiencies in the prior art, and this method technology is simple, and cost is low, can improve the yield of producing methomyl with this method. [0004] The present invention is achieved through the following technical solutions: a method for impro...

Claims

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Application Information

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IPC IPC(8): C07C327/58
Inventor 李子平王成顾军许自松
Owner 安道麦股份有限公司
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