Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of brominated poly(phenylene oxide) asymmetric membrane for water treatment

A brominated polyphenylene ether, asymmetric membrane technology, used in chemical instruments and methods, osmotic/dialysis water/sewage treatment, membrane technology, etc. It can improve the polarity, selectivity and transmittance, and save bromine resources.

Active Publication Date: 2018-02-16
WEIFANG RIXING CHEM
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main chain of the PPO molecule contains a polar ether bond. Through this structure, it is possible to separate liquid mixtures with different polarities. However, the polarity that the ether bond can provide is limited, and its own selectivity in water treatment Low and insoluble in polar aprotic solvents commonly used in film-forming processes, so it has not been widely used

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

[0024] A preparation method of brominated polyphenylene ether asymmetric membrane for water treatment, comprising the following steps:

[0025] (1) 1mol polyphenylene ether (PPO) and composite catalyst (iodine: aluminum trichloride: tin tetrachloride: antimony trichloride=0.5:1:4:2) are joined in organic solvent ethyl acetate, heat up To 60 ℃ until completely dissolved, the amount of ethyl acetate as an organic solvent is 5 times the mass of the polyphenylene ether;

[0026] (2) Cool down to 0°C, add 0.3mol bromine chloride, keep warm at low temperature for 1 hour, then raise the temperature to normal temperature to realize the bromination of the benzene ring of polyphenylene ether. After the reaction is completed, the catalyst is removed by washing with water, and the bromination of the benzene ring is obtained by standing and stratifying. Polyphenylene ether, the degree of bromination of the benzene ring is 26%;

[0027] (3) Add 0.2 mol tetraethylammonium bromide and 0.2 mo...

Embodiment 2

[0030] A preparation method of brominated polyphenylene ether asymmetric membrane for water treatment, comprising the following steps:

[0031] (1) 1mol polyphenylene ether (PPO) and composite catalyst (iodine: aluminum trichloride: tin tetrachloride: antimony trichloride=0.5:1:4:2) are joined in organic solvent ethyl acetate, heat up To 70 ℃ until completely dissolved, the amount of ethyl acetate as the organic solvent is 7 times the mass of the polyphenylene ether;

[0032] (2) Cool down to 0°C, add 0.4mol bromine chloride, keep warm at low temperature for 1 hour, then raise the temperature to normal temperature to realize the bromination of the benzene ring of polyphenylene ether. After the reaction is completed, the catalyst is removed by washing with water, and the bromination of the benzene ring is obtained by standing and stratifying. Polyphenylene ether, the degree of bromination of the benzene ring is 28%;

[0033] (3) Add 0.15 mol tetrabutylammonium bromide and 0.3 ...

Embodiment 3

[0036] A preparation method of brominated polyphenylene ether asymmetric membrane for water treatment, comprising the following steps:

[0037] (1) 1mol polyphenylene ether (PPO) and composite catalyst (iodine: aluminum trichloride: tin tetrachloride: antimony trichloride=0.5:1:4:2) are joined in organic solvent ethyl acetate, heat up To 80 ℃ until completely dissolved, the amount of organic solvent chlorobenzene is 8 times the mass of the polyphenylene ether;

[0038] (2) Lower the temperature to 0°C, add 0.5mol bromine chloride, keep the temperature at low temperature for 1 hour, then raise the temperature to normal temperature to realize the bromination of the benzene ring of polyphenylene ether. After the reaction is completed, the catalyst is removed by washing with water, and the bromination of the benzene ring is obtained by standing and stratifying. Polyphenylene ether, the degree of bromination of the benzene ring is 29%;

[0039] (3) Add 0.2 mol dibromohydantoin and...

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 preparation method of a brominated poly(phenylene oxide) asymmetric membrane for water treatment, and belongs to the technical field of water treatment. The method comprises:adding poly(phenylene oxide) and a catalyst to an organic solvent and raising the temperature till the poly(phenylene oxide) and catalyst are totally dissolved; reducing the temperature to 0 DEG C, adding a brominating agent, achieving benzene ring bromination of poly(phenylene oxide), completing a reaction, washing the obtained product with water to remove the catalyst, and performing standing and layering to obtain benzene-ring-brominated poly(phenylene oxide); adding a brominating agent and a catalyst to the organic layer obtained through layering, carrying out a secondary bromination reaction to achieve methyl bromination of poly(phenylene oxide), after the reaction is over, washing the obtained product with water to remove the catalyst, and performing standing and layering to obtainmethyl-brominated poly(phenylene oxide); and adding water and an emulsifier to the organic layer obtained from layering, steaming the obtained product to obtain the organic solvent, soaking the obtained product in a gel-phase conversion solvent made from acetone and an ammonia-water solution, and precipitating polymer to obtain the brominated poly(phenylene oxide) asymmetric membrane. Through poly(phenylene oxide) modification, a brominated poly(phenylene oxide) asymmetric membrane which is good in permselectivity and is used for water treatment is prepared.

Description

technical field [0001] The invention relates to a preparation method of a brominated polyphenylene ether asymmetric membrane for water treatment, belonging to the technical field of water treatment. Background technique [0002] Solving the organic pollution in water is one of the important issues of environmental protection, among which the problem of chlorinated hydrocarbons is the most urgent. In addition, ketones, ethers, alcohols, amines, and phenols are also important sources of pollution. The pervaporation process that uses organic liquids to preferentially pass through the membrane can effectively treat aqueous solutions containing a small amount of organic liquids and recycle the organic liquids. The key to processing lies in the choice of membrane material. [0003] Polyphenylene ether (chemical name is poly 2,6-dimethyl-1,4-phenylene ether, referred to as PPO) is a thermoplastic polymer with stable physical and chemical properties. It has excellent mechanical and...

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): B01D67/00B01D71/52C08G65/48C08G65/38C02F1/44
CPCB01D67/0006B01D71/52C02F1/44C08G65/485
Inventor 张存明宗先庆孙美玲郭安昊赵守俊
Owner WEIFANG RIXING CHEM