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

Method for preparing high purity (99.9 percent) 4,4'-difluorobenzophenone

A difluorobenzophenone, high-purity technology, applied in 4 fields, can solve problems such as inability to improve, and achieve the effect of mature recovery technology and mild synthesis process conditions

Inactive Publication Date: 2012-07-04
JINTAN CHUNFENG CHEM
View PDF1 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing synthesis technology of 4,4'-difluorobenzophenone, the purity of 4,4'-difluorobenzophenone monomer cannot be improved, and the ideal purity requirement of 99.9% is the current special engineering Worldwide Difficulties in the Field of Plastics Research Technology

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

[0020] The first step: in the 1000ml four-necked bottle that stirring, temperature juice, reflux spherical condenser and chlorine pipe are housed, drop into 4-fluorotoluene 275g (2.5mol) earlier, add initiator dibenzoyl peroxide ( BPO) appropriate amount, heat up to 90°C and start to feed liquid chlorine, add an appropriate initiator in the middle, react at 90°C to 100°C until the end, stop the chlorine flow for about 4 hours to 5 hours, that is, 4-fluorotrichloro Toluene 515g, the yield reaches 96.5%;

[0021] In the second step, in the four-necked reaction flask equipped with stirring, temperature juice, reflux condenser and constant pressure dropping funnel, first add 320g (1.5mol) of 4-fluorobenzotrichloride, and then add an appropriate amount of catalyst ferric chloride In the constant pressure dropping funnel, add 25.6g of water, start stirring, and when the temperature rises to 90°C, start to drop water with ferric chloride, and the reaction will start. Control the drop...

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 method for preparing high purity (99.9 percent) 4,4'-difluorobenzophenone, wherein 4-fluorotoluene and liquid chlorine are taken as starting raw materials and then are processed through chlorination reaction, hydration reaction and condensation reaction, and high purity (99.9 percent) 4,4'-difluorobenzophenone is obtained finally. The method gives up the conventional synthetic route; 4-fluorotoluene is processed through chlorination, hydration and condensation firstly to obtain 4,4'-difluorobenzophenone, wherein the melting point of 4,4'-difluorobenzophenone ranges from 107 to 108 DEG C, and the purity of 4,4'-difluorobenzophenone is 99.9 percent; the purity of 4,4'-difluorobenzophenone exceeds the conventional technical standard (99.7 percent) of English ICI (Imperial Chemical Industries Ltd.); in the preparation technology of the method, the adopted raw materials are easy to get, the synthesis process conditions are mild, and almost no environment hazards can be caused. The method satisfies the technical requirements of special engineering plastic containing polyether-ether-ketone on monomers.

Description

Technical field: [0001] The present invention relates to the preparation of 4,4'-difluorobenzophenone, in particular to the preparation of high-purity (99.9%) 4,4'-difluorobenzophenone. Background technique: [0002] 4,4′-Difluorobenzophenone (DFBP) is an important monomer of special high-performance engineering plastics polyether ether ketone, polyether ether ketone is a semi-crystalline aromatic thermoplastic special engineering plastics, it is high temperature resistant, Engineering plastics with particularly excellent corrosion resistance and abrasion resistance were successfully developed in the late 1970s in the UK. The British ICI company adopted the diazonium salt method, using 4,4'-diaminodiphenylmethane and sodium nitrite as raw materials. The 4,4'-difluorobenzophenone with a purity of 99.7% can be obtained from the diazotization reaction, decomposition reaction and oxidation reaction, which provide the most important raw material for the polymerization of polyethe...

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): C07C49/813C07C45/46
Inventor 于锁荣
Owner JINTAN CHUNFENG CHEM
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