Production process of 2-methyl-4-chlorophenoxyacetic acid

A technology of chlorophenoxyacetic acid and production process, which is applied in the field of pesticides, can solve the problems of high waste water and waste gas discharge, less than 10,000 tons, and slow chlorination efficiency, so as to improve chlorination efficiency, good social benefits, and reduce chlorine gas consumption Effect

Inactive Publication Date: 2018-11-09
JIANGSU JIANGU CHEM
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 2-Methyl-4-chlorophenoxyacetic acid is widely used in rice, wheat, corn, sorghum, sugarcane and non-cultivated land to control broad-leaved weeds. It is a mature product with no weed resistance, high effect and moderate price. With the modernization of agricultural production, the economic concepts of farmers’ friends have changed, and the use of herbicides has increased year by year. According to the statistics of the Ministry of Agriculture, th...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production process of 2-methyl-4-chlorophenoxyacetic acid
  • Production process of 2-methyl-4-chlorophenoxyacetic acid
  • Production process of 2-methyl-4-chlorophenoxyacetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The present invention will not be described below in conjunction with the embodiments.

[0020] The first step: Sodium chloroacetate preparation: Weigh quantitative chloroacetic acid into the sodium phosphate reaction kettle, add measured water or waste phenol water according to the proportion of liquid alkali content, start stirring, turn on the refrigerator to cool down the sodium phosphate reaction kettle, After the chloroacetic acid is completely dissolved, start to slowly add liquid caustic soda into the kettle, and strictly control the reaction temperature to ≤25°C. At the end of the reaction, the pH of the material should be controlled to be 7-8. After stirring for 20 minutes, check the pH value, and stop stirring after passing the test. When receiving the material loading notice, the pH value needs to be tested again to ensure that the qualified material liquid enters the next process.

[0021] ①The synthesis of sodium chloroacetate: (sodium acid)

[0022] ClC...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a production process of 2-methyl-4-chlorophenoxyacetic acid. The production process comprises the following steps: carrying out the procedures of perborate formation, condensation, chlorination, salt formation and the like on o-cresol, chloroacetic acid, dichloroethane and the like served as raw materials, recovering o-cresol by external circulation rectification under vacuum, and recycling o-cresol and water; performing reverse chlorination with an external circulation solvent to prepare 2-methyl-4-chlorophenoxyacetic acid. By adopting the production process, the chlorination efficiency is increased effectively, so that no waste water is discharged in production, chlorine gas consumption and industrial organic waste residue production are reduced, and green production is realized. The production process has a good social benefit.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a production process for 2-methyl-4-chlorophenoxyacetic acid. Background technique [0002] 2-Methyl-4-chlorophenoxyacetic acid is widely used in rice, wheat, corn, sorghum, sugarcane and non-cultivated land to control broad-leaved weeds. It is a mature product with no weed resistance, high effect and moderate price. With the modernization of agricultural production, the economic concepts of farmers’ friends have changed, and the use of herbicides has increased year by year. According to the statistics of the Ministry of Agriculture, the annual consumption of 2-methyl-4-chlorophenoxyacetic acid in China is about 50,000 tons, and the export volume is about 30,000 tons. The total production capacity of domestic manufacturers is less than 10,000 tons, and the gap is relatively large. At the same time, the chlorination efficiency of the existing 2-methyl-4-chlorophenoxyacetic aci...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C59/125C07C51/347C07C51/02C07C51/367C07C51/41C07C53/16C07C37/66C07C39/235
CPCC07C51/347C07C37/66C07C51/02C07C51/367C07C51/412C07C53/16C07C39/235C07C59/125
Inventor 董良胜陆劲松杜莹
Owner JIANGSU JIANGU CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap