Production technology of 2-methyl-4-chloro-sodium phenoxy acetate

Sodium phenoxyacetate, a new process technology, applied in the field of new chemical production process, can solve problems such as easy moisture absorption and caking, failure to meet export standards, excessive material consumption, etc., and achieve accelerated chlorination reaction speed and chlorination effect The effect of improving and improving the utilization rate

Inactive Publication Date: 2005-05-25
张沈昌
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, domestic production of 2-methyl-4-chlorine (MPCA) that is 2-methyl-4-chloro-sodium phenoxyacetate all adopts the traditional production process, and the traditional process has the following defects: (1) the chlorination reaction product yield is only 50% about
(2) The product has low purity (about 60%), contains more impurities (NaCL), is easy to absorb moisture and agglomerates, and has poor solubility, so it cannot be directly used in the production of 2-methyl-4-chloramine and ester products. To export standards, so that the development of such products has been subject to certain restrictions
(3) The phenol content is too high, about 4%, the dust and smell are relatively large during mixing, and it is easy

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 technology of 2-methyl-4-chloro-sodium phenoxy acetate
  • Production technology of 2-methyl-4-chloro-sodium phenoxy acetate
  • Production technology of 2-methyl-4-chloro-sodium phenoxy acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] 1. Neutralization process

[0030]

[0031] Put 580.6kg of chloroacetic acid and 247.8kg of sodium hydroxide in a storage tank, dissolve in 1051kg of water, react at room temperature for 4 to 5 hours, and cool with an ammonia refrigeration compressor to obtain chloroacetate;

[0032] 2. Etherification process

[0033] (1) Neutralization reaction

[0034]

[0035] Put 616.2kg of o-cresol and 253.1kg of sodium hydroxide into the etherification reaction kettle to dissolve with 363.5kg of water to carry out neutralization reaction.

[0036] (2) etherification reaction (conversion rate 90%)

[0037]

[0038] After the above reaction is finished, start adding sodium chloroacetate dropwise to carry out etherification reaction, control the temperature between 125-140°C, and react for 8-10 hours to obtain sodium 2-methyl-phenoxyacetate;

[0039] Input materials: sodium o-cresolate 741.7kg, sodium chloroacetate 715.8kg, water 1627.8kg.

[0040] After the process ...

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

A process for preparing 2-methyl-4-chloro-sodium phenoxyacetate from O-phenylcresol, chloroacetic acid, sodium hydroxide and chlorine gas includes such steps as neutralizing reaction, etherifying reaction, chlorating reaction and salting reaction. It can be used as herbicide.

Description

technical field [0001] The invention relates to a new process for chemical production, in particular to a new process for producing 2-methyl-4-chloro-phenoxyethyl sodium. Background technique [0002] The trade name of 2-methyl-4-chloro-phenoxyacetic acid sodium is 2 methyl 4 chlorine (MCPA), which is one of the most commonly used herbicide varieties. It is widely used in rice, wheat, corn and other cereal crop fields to control annual and perennial broad-leaved weeds and sedge weeds. The herbicide has the advantages of wide herbicidal spectrum, good effect, low price, and slow formation of weed resistance. At the same time, it can be used with various herbicides such as sodium pentachlorophenate, fenben, enemy brand, grass-killing, and proturon. , expand the herbicidal spectrum, improve the weeding effect, it is widely used, and the market demand is relatively large. [0003] At present, domestic production of 2-methyl-4-chlorine (MPCA) that is 2-methyl-4-chloro-sodium ph...

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): C07C51/347C07C59/68
Inventor 张沈昌张李龙张敬波杨贺赵甫合于健吴斌
Owner 张沈昌
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