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

A kind of synthetic method of high-quality zinc pyrithione

A technology of zinc pyrithione and its synthesis method, which is applied in the chemical industry and can solve problems such as unfavorable industrial production, loss of raw materials, and increased production costs

Active Publication Date: 2021-05-21
CHONGQING ZHONGBANG TECH CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have increased reaction operations and procedures, brought some unnecessary raw material consumption, and increased production costs; and a small amount of sodium pyrithione will remain in the filtrate after the acid stripping reaction, thereby causing raw material loss, and also A large amount of waste liquid is produced, which is not conducive to industrial production

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
  • A kind of synthetic method of high-quality zinc pyrithione

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 100g of 2-chloropyridine, 100g of distilled water and 3.0g of TS-1 molecular sieve catalyst into a 500mL four-necked flask, start stirring and heat up to 65°C, then start to drop 100g of hydrogen peroxide with a mass fraction of 30%, and control the dropping rate to maintain the reaction The temperature of the solution is 70-80°C. After the dropwise addition, the temperature is kept for 2 hours, and the temperature of the reaction solution is lowered to 45°C, and filtered to obtain a solution of 2-chloropyridine nitrogen oxide. Add 118g of sodium hydrosulfide with a mass fraction of 43% and 121g of a mass fraction of 30% sodium hydroxide solution into a 1000mL four-necked flask, start stirring and heat up to 65°C, and start to drop the 2-chloropyridine nitrogen oxide prepared above Solution, control the reaction temperature at 70-80°C, keep it warm for 2 hours after the dropwise addition, cool the reaction solution to 45°C, add 31% hydrochloric acid dropwise to adjus...

Embodiment 2

[0032]Add 100g of 2-chloropyridine, 100g of distilled water and 3.0g of TS-1 molecular sieve catalyst into a 500mL four-necked flask, start stirring and heat up to 65°C, then start to drop 100g of hydrogen peroxide with a mass fraction of 30%, and control the dropping rate to maintain the reaction The temperature of the solution is 70-80°C. After the dropwise addition, the temperature is kept for 2 hours, and the temperature of the reaction solution is lowered to 45°C, and filtered to obtain a solution of 2-chloropyridine nitrogen oxide. Add 118g of sodium hydrosulfide with a mass fraction of 43% and 121g of a mass fraction of 30% sodium hydroxide solution into a 1000mL four-neck flask, start stirring and when the temperature rises to 65°C, start to dropwise add the 2-chloropyridine nitrogen oxide prepared above solution, control the reaction temperature at 70-80°C, keep the reaction for 2 hours after the dropwise addition, cool the reaction solution to 45°C, add 31% hydrochlor...

Embodiment 3

[0036] The remaining 183.5g of pyrithione sodium solution (mass fraction of pyrithione sodium 33.9%) in implementation 1 continued to be distilled under reduced pressure at a temperature of 90°C, and when 35g of water was steamed, stop the rotary steaming and filter at 90°C Obtain 5.6g of sodium chloride solid and 142.9g of sodium pyrithione filtrate with a mass fraction of 43.1%. The sodium pyrithione filtrate is cooled to -2°C and stirred. After white crystals are precipitated, continue to insulate and stir for 30 minutes, and then filter to obtain pyrithione 44 g of sodium crystals (sodium pyrithione content: 76.4%) and 98.9 g of sodium pyrithione filtrate. Then 44g of sodium pyrithione crystals were dissolved in 292.2g of distilled water to prepare a 10% sodium pyrithione solution with a pH value of 9.1, stirred and heated to 50°C, and 142g of a mass fraction of 25% was added dropwise After the zinc sulfate solution was added dropwise, the solution was incubated and stirre...

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

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention discloses a synthesis method of pyrithione zinc, which uses 2-chloropyridine as a raw material to obtain pyrithione sodium solution after catalytic oxidation and mercaptolation reaction; the pyrithione sodium solution undergoes vacuum distillation to precipitate chlorine sodium pyrithione solid salt; heat preservation and filtration to obtain sodium pyrithione filtrate, crystallization at a low temperature of ‑10 to 10 °C; Sodium pyrithione solid is prepared into sodium pyrithione solution and reacted with water-soluble zinc salt to obtain zinc pyrithione product. The method of the invention has simple process and convenient operation, and the prepared product has high purity, good whiteness and good stability; at the same time, the synthesis process reduces the generation of three wastes, is green and environmentally friendly, and is beneficial to industrialized production.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for synthesizing high-quality zinc pyrithione. Background technique [0002] Zinc pyrithione (ZPT), as a broad-spectrum, low-toxicity, and environmentally friendly fungicide, is widely used in various fields of life, especially in the field of shampoo products. There are also many research reports on the synthesis of zinc pyrithione. At present, the synthesis process mainly uses pyridine, 2-aminopyridine, 2-carboxypyridine and 2-chloropyridine as starting materials. At present, 2-chloropyridine is mainly used as the starting raw material in China to prepare zinc pyrithione through catalytic oxidation, mercaptolation and salt formation; Due to the limitation of synthetic process route and raw materials, sodium pyrithione solution is yellow or light yellow, and it contains a large amount of alkali metal chloride salt and a small amount of impurities such as 2-ch...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/89
CPCC07D213/89
Inventor 王平薛谊王金山韩小军桂清
Owner CHONGQING ZHONGBANG TECH CO LTD
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