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Production method of chloromethyl ethyl ether

A technology of chloromethyl ethyl ether and its production method, which is applied in ether preparation, organic chemistry, etc., can solve the problems of cumbersome post-processing and high production cost, and achieve the effects of complete reaction, environment improvement and cost reduction

Active Publication Date: 2009-02-25
JIANGSU CHANGLONG AGROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The yield of this method can be improved, but after the phosphorus trichloride is hydrolyzed, a large amount of phosphorus-containing wastewater is produced, the post-treatment is more loaded down with trivial details, and the production cost is higher at the same time

Method used

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  • Production method of chloromethyl ethyl ether
  • Production method of chloromethyl ethyl ether

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Put 320g of paraformaldehyde and 460g of absolute ethanol into a 1000ml reaction bottle, start stirring, control the temperature between 0-20°C, and pass in hydrogen chloride, a by-product of the production of methyl isocyanate, when the ethanol content is lower than 0.5% When standing and stratifying, the bottom layer of chloromethyl ethyl ether has a weight of 928g, a content of 99.1%, and a yield of 97.3%. In terms of ethanol, it can directly carry out the synthesis of compounds such as acetochlor; the formaldehyde in the upper aqueous solution can be recycled and used mechanically.

Embodiment 2

[0023] 320g of paraformaldehyde and 485g of 95% ethanol (industrial grade) are dropped into a 1000 ml reaction bottle, and the stirring is started, and the temperature is controlled between 0-20° C., and the by-product hydrogen chloride produced in the production of methyl isocyanate is introduced. When the ethanol content is lower than 0.5%, stand for stratification, the bottom layer of chloromethyl ethyl ether has a weight of 885g, a content of 99.1%, and a yield of 92.8%. In terms of ethanol, it can directly carry out the synthesis of compounds such as acetochlor; formaldehyde can be recycled.

Embodiment 3

[0025] Put 865g of 37% formaldehyde aqueous solution and 485g of 95% ethanol into a 1000ml reaction bottle, start stirring, control the temperature between 0-20°C, and pass the by-product hydrogen chloride in the production of methyl isocyanate, when the ethanol content When it is lower than 0.5%, it is allowed to stand for stratification. The weight of chloromethyl ethyl ether in the bottom layer is 875g, the content is 98.3%, and the yield is 91.0%. In terms of ethanol, it can directly carry out the synthesis of compounds such as acetochlor, and the formaldehyde in the upper aqueous solution can be recovered apply.

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Abstract

The invention relates to a method for producing chloromethyl ethyl ether. The chloromethyl ethyl ether with high yield and high purity is made by adding a by-product chlorine hydride generated by production of methyl isocyanate to a mixture of ethanol and paraformaldehyde while stirring for reaction at the temperature of 0-50 DEG C, wherein, the mass ratio of the paraformaldehyde to the ethanol is 1-2:1. In the process of producing the chloromethyl ethyl ether by the method, as the by-product chlorine hydride generated by production of the methyl isocyanate is used, the waste gas from the methyl isocyanate is utilized, which improves environment and lowers cost; in the method for producing the chloromethyl ethyl ether, a little amount of impurities such as the methyl isocyanate, and the like, contained in the chlorine hydride facilitate the reaction and improve the reaction yield.

Description

technical field [0001] The invention relates to a production method of chloromethyl ether. Background technique [0002] Chloromethyl ethyl ether is an important raw material for the production of acetochlor and chlorfenapyr, and is also a common raw material for chloromethylation in organic synthesis. Acetochlor is one of the world's leading large-tonnage herbicides. It has the characteristics of safety, high efficiency, and broad herbicidal spectrum. , Beef chickweed, amaranth, Buzz grass, purslane and a series of weeds. It is widely used in corn, rice and other crops; chlorfenapyr is an excellent broad-spectrum insecticide, which has excellent control effect on more than 70 kinds of pests in Lepidoptera, Homoptera, Coleoptera and other orders. It is especially effective against vegetable-resistant pests such as diamondback moth, beet armyworm, Spodoptera litura, Liriomyza sativae, bean borer, thrips, red spider, etc. It is a bionic pesticide with low toxicity and fast i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/17C07C41/01
Inventor 陆明若张中泽田庆海万红义
Owner JIANGSU CHANGLONG AGROCHEM CO LTD
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