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Quaternary ammonium type anion exchange agent and its preparation method

An anion exchanger, quaternary ammonium type technology, applied in the field of functional polymers, can solve the problem of low exchange capacity of quaternary ammonium groups, and achieve the effects of improving multi-substitution and secondary cross-linking, high conversion rate and reducing harm

Inactive Publication Date: 2005-03-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires multi-step reactions, and the exchange capacity of the quaternary ammonium group is not high, and the measured nitrogen content is less than half of the theoretical value

Method used

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  • Quaternary ammonium type anion exchange agent and its preparation method
  • Quaternary ammonium type anion exchange agent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Take 1g of polystyrene (cross-linking degree: 7% DVB, particle size: 8μm) into a three-neck reaction flask, add anhydrous dichloromethane to swell, stir to make it evenly dispersed, add 0.8ml of chloroacetyl chloride dropwise, and blow in nitrogen , Add 1.3g of aluminum trichloride under stirring, and react at room temperature and pressure for 4.5h. That is, chloroacetylated polystyrene with a supported amount of 4.1 meq / g was obtained.

[0025] Take 1g of the above resin in a round bottom beaker, add 10ml of tetrahydrofuran, swell for 12h, add trimethylamine, stir to disperse evenly, and react at 70°C under normal pressure for 3h. That is, a quaternized resin with a loading capacity of 3.3 meq / g was obtained.

Embodiment 2

[0027] Take 1g of polystyrene (cross-linking degree: 7% DVB, particle size: 200μm) into a three-necked reaction flask, add anhydrous dichloromethane to swell, stir to make it evenly dispersed, add 0.16ml of chloroacetyl chloride dropwise, and blow in nitrogen , add 0.26g of aluminum trichloride under stirring, and react at normal temperature and pressure for 1h. That is, chloroacetylated polystyrene with a loading amount of 1.5 meq / g was obtained.

[0028] Take 1g of the above resin in a round-bottomed beaker, add 5ml of tetrahydrofuran, swell for 12h, add trimethylamine, stir to disperse evenly, and react at 70°C under normal pressure for 3h. That is, a quaternized resin with a loading capacity of 1.4meq / g was obtained.

Embodiment 3

[0030] Take 10g of polystyrene (cross-linking degree: 7% DVB, particle size: 200μm) into a three-necked reaction flask, add anhydrous dichloromethane to swell, stir to disperse evenly, add 0.3ml of bromoacetyl bromide dropwise, and blow in nitrogen , add 1.4g of zinc chloride under stirring, and react at room temperature and pressure for 0.5h. That is, bromoacetylated polystyrene with a loading amount of 0.34 meq / g was obtained.

[0031] Take 1g of the above resin in a round bottom beaker, add 5ml of ethanol, swell for 12h, add trimethylamine, stir to disperse evenly, and react at 70°C under normal pressure for 3h. That is, a quaternized resin with a loading capacity of 0.33meq / g was obtained.

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Abstract

A quanternary ammonium type anionic exchanging agent with 0.3-3.9 meq / g dry agent of exchange capacity is prepared through Friedel-Crafts acylation reaction to introduce the alpha-haloaceyl to polystyrene and reaction on amine or ammonia.

Description

technical field [0001] The invention belongs to the field of functional polymers. Specifically relates to a quaternary ammonium anion exchanger with dual functions of adsorption and exchange and a preparation method thereof. Background technique [0002] Quaternary ammonium strong basic anion exchanger is a kind of ion exchanger. Its uses are very extensive. In the water treatment industry, strong basic anion exchangers can be used to remove impurity ions; in catalytic chemical reactions, strong basic anion exchangers can be used in reactions such as Michael addition, cyanohydration, and phenolic alcohol condensation; In terms of chemistry, strong basic anion exchangers can be used for the extraction of alkaloids, the separation and purification of streptomycin and amino acids, etc. [0003] The usual method for preparing strongly basic anion exchangers uses raw materials such as chloromethyl ether or dichloromethyl ether with strong carcinogenicity, such as using chlorom...

Claims

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Application Information

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IPC IPC(8): B01J41/14
Inventor 刘晓宁魏荣卿王强欧阳平凯
Owner NANJING UNIV OF TECH
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