Method for continuously producing herbicide 2,4-dichlorophenoxyacetic acid

A technology of dichlorophenoxyacetic acid and herbicide, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of floating, the influence of chlorinated product quality, increase of human operation factors, etc., to achieve industrial Production, safe and continuous industrial production, the effect of reducing emissions

Active Publication Date: 2015-04-22
台州煜农生物科技有限公司
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  • Description
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  • Application Information

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Problems solved by technology

The intermittent production of 2,4-dichlorophenoxyacetic acid has many technical disadvantages, such as: (1), the chlorination section adopts the traditional batch method operation, which increases the human operation control factors and has a great impact on the quality of the chlorinated finished product (2), the production process control of the condensation workshop section is unstable, which increases the human operation factor, causing the fluctuation of the conversion rate of the condensa

Method used

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  • Method for continuously producing herbicide 2,4-dichlorophenoxyacetic acid
  • Method for continuously producing herbicide 2,4-dichlorophenoxyacetic acid
  • Method for continuously producing herbicide 2,4-dichlorophenoxyacetic acid

Examples

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example 1

[0021] A microchannel reactor is used to continuously feed phenol (94kg / h, 1.00kmol / h) and chlorine gas (142kg / h, 2.00kmol / h) through a metering pump. The reaction temperature is controlled at 50°C, and 2,4-dichloro Phenol content, control the content of 2,4-dichlorophenol to be greater than 90.0%, recover hydrogen chloride gas, and the synthesis yield is 96.9%.

example 2

[0023] Adopt 3-5 stage series continuous reactor, pass into 2,4-dichlorophenate sodium solution (185kg / h, 1.00kmol / h), sodium chloroacetate solution (118kg / h, 1.00kmol / h), reaction temperature At 80°C, the reaction liquid overflows from the last stage of the reaction kettle to the cooling kettle, and the temperature is lowered to 50°C. The cooled material enters the integrated suction filtration and washing machine to obtain the sodium salt of 2,4-dichlorophenoxyacetic acid.

example 3

[0025] Using 2-3 series continuous reactors, feed 2,4-dichlorophenoxyacetic acid sodium salt solution (243kg / h, 1.00kmol / h), 36.5% hydrochloric acid (100kg / h, 1.00mol / h), The pH value is adjusted, and the material enters the integrated suction filter and washing machine to obtain 2,4-dichlorophenoxyacetic acid with a content of 98.2% and a yield of 97.1%.

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Abstract

The invention discloses a method for continuously producing herbicide 2,4-dichlorophenoxyacetic acid. According to the method, phenol and chlorine gas are used as raw materials; a continuous chlorination reaction is conducted through a micro-channel reactor to prepare 2,4-dichlorophenol, a condensation reaction is conducted through a tandem condensation reaction kettle to prepare 2,4-dichlorphenoxyacetic acid sodium salt, and then a continuous acidification reaction is conducted through a tandem acidification reaction kettle to prepare the 2,4-dichlorphenoxyacetic acid. Since continuous operation is realized in all the three reactions, the technological process is efficient, environmentally friendly, sustainable and suitable for industrial production; the method has the advantages that energy is saved, consumption is lowered, and emission of pollutants is reduced, and therefore safe and continuous industrial production is achieved.

Description

technical field [0001] The invention relates to a method for producing the herbicide 2,4-dichlorophenoxyacetic acid, in particular to a method for producing the herbicide 2,4-dichlorophenoxyacetic acid using a continuous process, which belongs to the preparation technology of the herbicide field. Background technique [0002] 2,4-Dichlorophenoxyacetic acid is a kind of widely used systemic conductive herbicide, which has phytohormone effect and herbicidal selection effect, and can stimulate the growth of plants at low concentration; Can destroy the plant metabolic process and kill the plant. At present, it is widely used in the control of weeds in wheat fields, corn, fruit trees, vegetables and other crops. [0003] The world's annual demand for 2,4-dichlorophenoxyacetic acid is over 50,000 tons. Major domestic manufacturers include Changzhou Yongtaifeng Chemical Co., Ltd., Shandong Weifang Runfeng Chemical Co., Ltd., etc. At present, there are mainly two kinds of prepara...

Claims

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Application Information

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IPC IPC(8): C07C59/70C07C51/02
CPCC07C37/62C07C37/66C07C51/02C07C51/367C07C39/30C07C59/70
Inventor 徐德锋杜剑萍
Owner 台州煜农生物科技有限公司
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