Grafted quaternary ammonium cation resin and preparation method thereof

A cationic resin and quaternary ammonium-based technology is applied in the field of grafted quaternary ammonium-based cationic resin and its preparation, which can solve the problems of poor electrical regeneration effect of strong acid and strong alkali mixed resin, and achieve the effect of improving electrical regeneration performance.

Active Publication Date: 2020-09-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented new type of ion exchange material has improved electrical properties that makes it better at capturing charged particles from an aqueous solution compared with existing materials like strongly basic or weakly alkaline ones. These improvements make them more effective for use in various applications such as purifying drinking waters, treatments involving contaminated liquids containing harmful metals, and separating soluble substances (such as salts) from solutions made up mostly of these compounds.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality or quantity of anions produced during water treatment without requiring expensive materials like calcium chloride solution used for their removal process.

Method used

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  • Grafted quaternary ammonium cation resin and preparation method thereof
  • Grafted quaternary ammonium cation resin and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) Introduction of quaternary ammonium groups in chloromethylated cross-linked polystyrene resin

[0039] 1.1) Add 15 parts of chloromethylated cross-linked polystyrene resin and 18 parts of trimethylamine hydrochloride to the reaction vessel in sequence;

[0040] 1.2) Add 72 parts of 20% sodium hydroxide aqueous solution dropwise to the reaction vessel within 1 hour, keep the reaction temperature at 30~40°C, and react for 2 hours under continuous stirring;

[0041] 1.3) After the reaction is completed, the reaction solution is filtered, transformed with 750 parts of 5% aqueous sodium hydroxide solution and 750 parts of 5% aqueous hydrochloric acid solution, and washed with 4500 parts of deionized water until the pH of the effluent is 7;

[0042] 1.4) drying at 60°C to obtain a chloromethylated cross-linked polystyrene resin with quaternary ammonium groups;

[0043] 2) Sulfonation of chloromethylated cross-linked polystyrene resins with quaternary ammonium groups

[0...

Embodiment 2

[0054] 1) Introduction of quaternary ammonium groups in chloromethylated cross-linked polystyrene resin

[0055] 1.1) Add 20 parts of chloromethylated cross-linked polystyrene resin and 20 parts of trimethylamine hydrochloride to the reaction vessel in sequence;

[0056] 1.2) Add 80 parts of 20% sodium hydroxide aqueous solution dropwise to the reaction vessel within 1 hour, keep the reaction temperature at 30~40°C, and react for 2 hours under continuous stirring;

[0057] 1.3) After the reaction is completed, the reaction solution is filtered, transformed with 1000 parts of 5% aqueous sodium hydroxide solution and 1000 parts of 5% hydrochloric acid aqueous solution, and washed with 6000 parts of deionized water until the pH of the effluent is 7;

[0058] 1.4) drying at 60°C to obtain a chloromethylated cross-linked polystyrene resin with quaternary ammonium groups;

[0059] 2) Sulfonation of chloromethylated cross-linked polystyrene resins with quaternary ammonium groups

...

Embodiment 3

[0070] 1) Introduction of quaternary ammonium groups in chloromethylated cross-linked polystyrene resin

[0071]1.1) Add 10 parts of chloromethylated cross-linked polystyrene resin and 5 parts of trimethylamine hydrochloride to the reaction vessel in sequence;

[0072] 1.2) Add 20 parts of 20% sodium hydroxide aqueous solution dropwise to the reaction vessel within 1 hour, keep the reaction temperature at 30~40°C, and react for 2 hours under continuous stirring;

[0073] 1.3) After the reaction is completed, the reaction solution is filtered, transformed with 500 parts of 5% aqueous sodium hydroxide solution and 500 parts of 5% aqueous hydrochloric acid solution, and washed with 3000 parts of deionized water until the pH of the effluent is 7;

[0074] 1.4) drying at 60°C to obtain a chloromethylated cross-linked polystyrene resin with quaternary ammonium groups;

[0075] 2) Sulfonation of chloromethylated cross-linked polystyrene resins with quaternary ammonium groups

[007...

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Abstract

The invention discloses a grafted quaternary ammonium cation resin and a preparation method thereof. The preparation method comprises the following steps: sequentially adding chloromethylated crosslinked polystyrene resin, trimethylamine hydrochloride and a 20% sodium hydroxide aqueous solution into a reactor in parts by weight, keeping the temperature of the reactor at 30-40 DEG C, reacting for 3hours while stirring, filtering, washing, and drying to obtain quaternary ammonium group introduced resin; and sequentially adding the resin, 1,2-dichloroethane and silver sulfate into a reactor, heating to 50-60 DEG C, adding concentrated sulfuric acid and fuming sulfuric acid, reacting for 1 hour, heating to 70-80 DEG C, reacting for 1 hour, heating to 115-125 DEG C, reacting for 5 hours, cooling to room temperature, diluting the obtained reaction solution, filtering, washing, and drying to obtain the grafted quaternary ammonium cation resin. The resin obtained by the invention has good electric regeneration performance, and can be used for preparing high-purity water and treating heavy metal wastewater in a membrane-free electrodeionization technology.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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