Method for increasing yield of methomyl

A technology for the yield of methomyl and methomyl, which is applied in the field of recycling target products and improving the yield of methomyl, can solve the problem of chemical synthesis reaction selection and low yield, product quality cannot be guaranteed, and reaction temperature is not high. Good control and other issues, to achieve the effect of low cost, increase production yield and quality, and simple method

Inactive Publication Date: 2020-05-22
安道麦股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many side reactions, the reaction temperature is not easy to control, the reaction time is long, and the product quality cannot be guaranteed
The selection and yield of the chemical synthesis reaction are not high, and the output is not high

Method used

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  • Method for increasing yield of methomyl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This example discloses that methomyl is reacted with methyl isocyanate to prepare methomyl aqueous solution, and then the crude methomyl product is obtained through the process of heating up, recrystallization, pressure filtration, and drying, wherein the mother liquor from pressure filtration is recovered and salted out again , the methomyl mother liquor obtained by pressure filtration is measured again and put into industrial sodium chloride in proportion, and the methomyl crystallization is separated out by using the difference in solubility, and then the methomyl crude product is obtained through suction filtration.

Embodiment 2

[0024] Put 1.7-1.8t of the crude methomyl obtained in Example 1 into a warming kettle prepared with fresh water, put in 20kg of activated carbon to absorb the decolorizing agent, raise the temperature to 60-70°C, fully absorb for 1.5-2.0h, and then pass The above-mentioned special filter device absorbs the impurities in the crude methomyl,

[0025] The device is a precision filter, which is equipped with 5 sets of precision filter carbon rods, with a pore size of 0.5 mesh, which can completely intercept the adsorbed activated carbon and impurities in the crude product, especially the bottom of the filter device. Rod, can completely filter the filtrate in the filter device, and then discharge the dry filter residue from the slag outlet at the bottom, which can not only facilitate the activation and regeneration of the carbon rod, but also prevent excessive solid residue from clogging and affecting the filtration efficiency. The specific process flow See attached figure 1 Descr...

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Abstract

The invention discloses a method for increasing the yield of methomyl, and belongs to the technical field of fine chemical engineering. The method comprises: carrying out a reaction on methomyl oximeand methyl isocyanate to obtain a methomyl crude product; putting the methomyl crude product into a heating kettle filled with water, adding active carbon, heating to 60-70 DEG C, and fully adsorbing;and transferring into a filtering device, filtering, feeding the filtrate into a crystallization kettle, and carrying out normal recrystallization, filter pressing and drying to obtain high-quality methomyl with a purity of 98.7% or above. The target product obtained by the method has the advantages of high yield, good crystal form and bright white color.

Description

technical field [0001] The invention relates to the recycling of target products, belongs to the technical field of fine chemicals, and in particular relates to a method for increasing the yield of methomyl. Background technique [0002] Methomyl is a broad-spectrum carbamate insecticide with systemic contact and stomach poisoning. It is suitable for controlling pests such as aphids, moths and cutworms in cotton, tobacco, fruit trees and vegetables. A good alternative to medicinal cotton aphids. Methomyl can also be used as an intermediate of thiodicarb. It is a broad-spectrum, quick-acting insecticide that is effective against aphids, cotton bollworms and other pests. It can be used in crops such as grain, cotton, vegetables, tobacco, and fruits. [0003] The domestic pesticide methomyl reacts with methylthioglycetaldoxime and methyl isocyanate at a temperature of 5°C to directly synthesize the target product. Currently, kettle reactors and batch methods are generally used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C327/58
CPCC07C327/58
Inventor 李子平李金元严峰
Owner 安道麦股份有限公司
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