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A kind of preparation method of modified polyphenylene ether membrane for water treatment

A polyphenylene ether and water treatment technology, applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membrane technology, etc., can solve the problem of polar aprotic solvent dissolution, has not been widely used, and has low selectivity. and other problems, to achieve the effect of improving polarity, selectivity and transmittance, and saving bromine resources

Active Publication Date: 2019-05-28
WEIFANG RIXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing a modified polyphenylene ether membrane for water treatment, comprising the following steps:

[0021] (1) Add 300Kg of organic solvent chloroform to the reaction kettle, add 50Kg of polyphenylene ether and 0.5Kg of catalyst tin tetrachloride under stirring, raise the temperature to 60°C, and stir for 1 hour until the materials are completely dissolved;

[0022] (2) Add 0.28Kg brominating agent N-bromosuccinimide and 0.05Kg oxidant hydrogen peroxide and 0.16Kg initiator benzoyl peroxide in the reactor, after insulation reaction 3h, add 300kg water, carry out washing and remove Catalyst, static layering, distillation recovery of chloroform to obtain brominated polyphenylene ether, the degree of methyl bromination in this brominated polyphenylene ether is 25%, and the degree of bromination of benzene ring is 16%;

[0023] (3) adopt the gel phase inversion method, add 100L carbon tetrachloride and 100L isopropanol in another reactor and stir and mix, ...

Embodiment 2

[0025] A method for preparing a modified polyphenylene ether membrane for water treatment, comprising the following steps:

[0026] (1) Add 350Kg of organic solvent dichloropropane to the reaction kettle, add 50Kg of polyphenylene ether and 0.6Kg of catalyst titanium tetrachloride under stirring, raise the temperature to 70°C, and stir for 1 hour until the materials are completely dissolved;

[0027] (2) add 0.6Kg brominating agent tetraethylammonium bromide and 0.1Kg oxygenant hydrogen peroxide and 0.21Kg initiator azobisisobutyronitrile in reactor, after insulation reaction 3h, add 300kg water, carry out washing and remove catalyzer, Static layering, distillation and recovery of chloroform to obtain brominated polyphenylene ether, the degree of methyl bromination in this brominated polyphenylene ether is 28%, and the degree of bromination of benzene rings is 17%;

[0028] (3) Adopt the gel phase inversion method, add 90L carbon tetrachloride and 110L isopropanol in another r...

Embodiment 3

[0030] A method for preparing a modified polyphenylene ether membrane for water treatment, comprising the following steps:

[0031] (1) Add 400Kg of organic solvent chloroform to the reaction kettle, add 50Kg of polyphenylene ether and 0.5Kg of catalyst tin tetrachloride under stirring, raise the temperature to 60°C, and stir for 1 hour until the materials are completely dissolved;

[0032] (2) add 0.4Kg brominating agent N-bromosuccinimide and 0.06Kg oxidant sodium peroxide and 0.2Kg initiator benzoyl peroxide in reactor, after insulation reaction 3h, add 300kg water, carry out Washing with water to remove the catalyst, static layering, distillation and recovery of chloroform to obtain brominated polyphenylene ether, the degree of methyl bromination in this brominated polyphenylene ether is 24%, and the degree of bromination of benzene rings is 19%;

[0033] (3) Adopt the gel phase inversion method, add 90L carbon tetrachloride and 120L isopropanol in another reaction kettle ...

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PUM

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Abstract

The invention discloses a preparation method of a modified polyphenylene oxide film for water treatment, which belongs to the technical field of water treatment, and comprises the following steps of adding polyphenylene oxide (PPO) and a catalyst into an organic solvent, and heating until completely dissolving; adding a quantitative brominating agent, orientatedly and quantitatively brominating the polyphenylene oxide under a combined action of an initiator and an oxidizing agent, after accomplishing reaction, removing the catalyst through water washing and layering, distillation-recycling theorganic solvent, and obtaining brominated polyphenylene oxide; adopting a gel phase inversion method, stirring and dissolving the obtained brominated polyphenylene oxide in a gel phase inversion solvent prepared from halogenated hydrocarbon and an alcoholic solution, filtering, standing for defoaming, and scraping and film-forming on a glass plate to obtain a brominated polyphenylene oxide film.The polyphenylene oxide is orientatedly and quantitatively brominated and modified, so that the polarity and the permselectivity of the polyphenylene oxide are improved, and the brominated polyphenylene oxide film for water treatment, which has excellent transmittance and selectivity, and is not affected by the solvent during a film forming process, is obtained.

Description

technical field [0001] The invention relates to a preparation method of a modified polyphenylene ether membrane for water treatment, belonging to the technical field of water treatment. Background technique [0002] 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 thermal properties. It is not only a It is a heat-resistant engineering plastic with a high glass transition temperature, and has a high permeability to various gases. Many studies at home and abroad have used homogeneous, asymmetric or modified PPO for gas separation membranes, showing good performance. Permeation and separation performance. Polyphenylene ether has good film-forming performance and high strength, so it can be used as a membrane material for water treatment containing organic pollution. The pervaporation process in which organic liquid preferentia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/48C08J5/18C08L71/12B01D71/52B01D67/00B01D61/36C02F1/44
CPCY02P20/584
Inventor 张存明宗先庆孙美玲郭安昊孙丹阳
Owner WEIFANG RIXING CHEM