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

Method for preparing 4,4'-diaminodiphenyl ether

A technology of diaminodiphenyl ether and dinitrodiphenyl ether, applied in the field of preparation 4, can solve the problems of high price, strong corrosion and high cost of hydrazine hydrate, and achieve easy industrial promotion and application, good quality and low production cost Effect

Inactive Publication Date: 2006-07-26
CHANGZHOU SUNLIGHT PHARMA
View PDF0 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrazine hydrate is more expensive, the cost is higher, and it is highly corrosive and toxic

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
  • Method for preparing 4,4'-diaminodiphenyl ether
  • Method for preparing 4,4'-diaminodiphenyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Into the autoclave of 50L band stirrer, drop into 4Kg 4,4'-dinitrodiphenyl ether, 20g Pd content is the mixed solvent that the Pd / c catalyst of 3%, 25L methyl alcohol and 5L dimethylformamide form, Steam is passed into the interlayer of the high-pressure reactor to heat up the temperature. The high-pressure reactor is first replaced with nitrogen three times, and then replaced with hydrogen three times respectively, and the catalytic hydrogenation reduction reaction is carried out under the conditions of 95-100°C and 0.4Mpa. After the hydrogenation reaction is completed, filter while it is hot to separate the Pd / C catalyst, and then recycle the separated Pd / C catalyst after cleaning and activation. The crude 4,4'-diaminodiphenyl ether is 2.78Kg, the melting point is 190.0~190.4℃, the molar yield is 90.4%, the mixed solvent can also be recycled, and the crude 4,4'-diaminodiphenyl ether is vacuum sublimated 2.77 kg of white crystals of polymer grade 4,4'-diaminodiphenyl e...

Embodiment 2

[0026] Other conditions are the same as in Example 1, except that the Pd / c catalyst adopts a Pd / c catalyst with a Pd content of 5%. 2.83Kg of crude 4,4'-diaminodiphenyl ether was obtained, with a melting point of 190.1-190.5°C and a molar yield of 91.8%. The crude 4,4'-diaminodiphenyl ether was sublimated under reduced pressure to obtain 2.80 kg of white crystals of polymerization-grade crude 4,4'-diaminodiphenyl ether, with a melting point of 191.0-191.5°C and a molar yield of 91.0%.

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 relates to a preparation method for 4, 4'-diamino diphenyl ether, which comprises: taking catalytic hydrogenation reduction reaction to the 4, 4'-dinitro diphenyl ether in alcohol solvent; crystallizing to obtain the coarse product; reducing pressure to sublimate and refine the coarse product for final product. This invention has well product quality and no pollution with low cost, and more fit to spread than the traditional ferrous powder-chlorhydric acid reduction method.

Description

Technical field [0001] The invention relates to a method for preparing 4,4'-diaminodiphenyl ether, which belongs to the technical field of fine chemicals. Background technique [0002] 4,4'-Diaminodiphenyl ether is a fine organic product with high added value. It is one of the important raw materials of new special engineering plastics polyimide, polyetherimide, polyesterimide, polyamideimide, polymaleimide, polyaramide and other high temperature resistant resins. It is also the raw material for the synthesis of 3,3',4,4'-tetraaminodiphenyl ether, which is used to prepare a series of new heat-resistant aromatic heterocyclic polymer materials such as polybenzimidazole, polyphenylquinoline, polyimidazole The main monomer of pyrolone. It can also be used as a raw material and crosslinking agent for synthetic polymer materials such as high-performance heat-resistant epoxy resin and polyurethane. At the same time, it is also used to replace the carcinogenic benzidine to produc...

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 Applications(China)
IPC IPC(8): C07C213/00C07C217/90
Inventor 胡国宜薛建伟丁志伟储秋生闵雪峰
Owner CHANGZHOU SUNLIGHT PHARMA
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