Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Production technology for synthesizing bromoxynil

A production process and a technology for bromoxynil are applied in the production process field of bromoxynil synthesis, can solve the problems of complex production process, difficult to conform to human beings, low purity, etc., and achieve the effects of high purity, good use effect and easy-to-obtain raw materials

Inactive Publication Date: 2014-05-14
ANHUI HUARUN PAINTS
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bromoxynil is stable in storage and generally does not react with other herbicides. In addition to being used alone, it can also be mixed with a variety of herbicides to expand the weeding spectrum. At present, the method of industrial production of bromoxynil is still relatively traditional. In the traditional production method, there are problems such as low yield, low purity and serious pollution, and the production process is relatively complicated, which is difficult to meet the needs of human beings.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of production technology that bromoxynil is synthesized is characterized in that: comprise following processing step,

[0022] (1) Synthesis of p-Hydroxybenzonitrile

[0023] a. Choose a 250ml three-necked flask, which is equipped with a stirrer, a thermometer, and a reflux condenser.

[0024] b. Weigh 13-14g of p-hydroxybenzoic acid, 8-10g of urea, 19-20g of sulfamic acid and 40-60ml of p-cresol into the three-necked flask in step a in sequence, and start stirring.

[0025] c. Heat the mixed solution in the flask in step b, slowly raise the temperature to 140-160° C., and then keep it warm for 35-45 minutes.

[0026] d. After the heat preservation reaction in step c is completed, raise the temperature to 180-200° C. again, add 2-4 g of urea again, and continue the heat preservation reaction for 55-65 minutes.

[0027] e. filter the reacted mixture in step d, then wash the filter residue with a hot melt agent and combine the filtrate to obtain p-hydroxybenzonit...

Embodiment 2

[0035] A kind of production technology that bromoxynil is synthesized, comprises following processing steps,

[0036] (1) Synthesis of p-Hydroxybenzonitrile

[0037] a. Choose a 250ml three-necked flask, which is equipped with a stirrer, a thermometer, and a reflux condenser.

[0038] b. Weigh 13.8g of p-hydroxybenzoic acid, 9g of urea, 19.4g of sulfamic acid and 50ml of p-cresol and add them to the three-necked flask in step a in sequence, and start stirring.

[0039] c. Heat the mixed solution in the flask in step b, slowly raise the temperature to 150° C., and then keep it warm for 40 minutes.

[0040] d. After the heat preservation reaction in step c is completed, the temperature is raised to 190° C. again, and 3 g of urea is added again, and the heat preservation reaction is continued for 60 minutes.

[0041] e. filter the reacted mixture in step d, then wash the filter residue with a hot melt agent and then combine the filtrate to obtain p-hydroxybenzonitrile by distil...

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 technology for synthesizing bromoxynil, and relates to the technical field of chemical industry. Cyanophenol is subjected to bromination reaction to obtain bromoxynil as a raw material after being synthesized. The production technology has the beneficial effects that the technology is simple and convenient to prepare, environment-friendly, free of pollution, available in raw material, less in equipment investment, high in purity, convenient to operate, good in use effect of prepared bromoxynil, and safe and reliable.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production process for the synthesis of bromoxynil. Background technique [0002] Bromoxynil pure product is colorless crystal, melting point 194-195°, solubility: 130mg / liter water, 170g / liter in acetone. Bromoxynil industrial product is slightly beige crystal, the content is ≥95%, and the melting point is 189~192℃. Bromoxynil is widely used abroad as a contact herbicide for selective post-emergence stem and leaf treatment in the form of its octanoate, sodium salt, and potassium salt. It is mainly absorbed by the leaves, and rapidly causes tissue necrosis by inhibiting the various processes of photosynthesis. This agent is mainly used in wheat, barley, rye, corn, sorghum, flax and other crop fields. The amount of wheat is 22.5-35g per mu; sorghum and corn are 18.7-30g per mu; flax is not more than 18.7g per mu. Bromoxynil is stable in storage and generally does n...

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): C07C255/50C07C253/30
Inventor 张学永陆建新靳民张广生
Owner ANHUI HUARUN PAINTS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com