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High-temperature-resistant guanidine-based strong-basic anion exchange resin for strong base and synthesis method thereof

A technology of exchange resin and synthesis method, which is applied in the direction of anion exchange, ion exchange, chemical instruments and methods, etc. It can solve the problems of cumbersome synthesis process, no fundamental improvement of resin thermal stability, expensive synthetic raw materials, etc., and achieve simple synthesis process , The effect of improving thermal stability

Active Publication Date: 2011-10-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the current research status, the structural modification of strong base anion exchange resins still focuses on changing the connection mode between the quaternary ammonium group and the resin skeleton, thereby indirectly improving the thermal stability of the quaternary ammonium group. The thermal temperature has been significantly improved compared with ordinary strong base anion exchange resins, but due to the limitation of the quaternary ammonium structure, the thermal stability of this type of resin has not been fundamentally improved. Most importantly, the synthesis process of the resin is cumbersome and the synthetic raw materials are expensive. Greatly limit the large-scale industrial production and application of resin

Method used

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  • High-temperature-resistant guanidine-based strong-basic anion exchange resin for strong base and synthesis method thereof
  • High-temperature-resistant guanidine-based strong-basic anion exchange resin for strong base and synthesis method thereof
  • High-temperature-resistant guanidine-based strong-basic anion exchange resin for strong base and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035]In a 250ml three-necked bottle equipped with mechanical stirring, a spherical condenser, and a thermometer, add 20 g of gel-type chloromethylated polystyrene resin with a crosslinking degree of 1% (w%) (chlorine content is 5.26 mmol / g) and 160mL N,N-dimethylformamide (DMF). After the resin was fully swelled in DMF for 4 hours, 12.5g (ie 211.8 mmol) of guanidine was added to the three-neck flask, stirring was started, and at the same time, the concentration of 3mol / L ethanol After the DMF solution of sodium regulates the alkalescence of reaction solution to pH=10, start to heat up, when to 60 DEG C, after being incubated for 8 hours, sampling, the residual chlorine content in the measuring resin is 0.24mmol / g, stops heating and stirring, Let it stand at room temperature, filter out the resin, wash the resin with a large amount of deionized water until the pH value of the washing solution is 7.0, drain the free water of the above resin, and obtain the light yellow spherical...

Embodiment 2

[0037] In a 500ml three-necked flask equipped with mechanical stirring, a spherical condenser, and a thermometer, add 30g of gel-type chloromethylated polystyrene resin with a crosslinking degree of 4% (w%) (chlorine content is 4.98mmol / g) and 240mL N,N-dimethylformamide (DMF). After the resin is fully swelled in DMF for 8 hours, add 22.0g (ie 372.9 mmol) guanidine into the three-necked flask, start stirring, and use a concentration of 3mol / L The DMF solution of sodium ethylate adjusted the alkalinity of the reaction solution to pH=12, then began to heat up, and when it reached 65 ° C, after 12 hours of insulation, sampling was carried out, and the residual chlorine content in the measured resin was 0.28mmol / g, and the heating and stirring were stopped. , let it stand to room temperature, filter out the resin, wash the resin with a large amount of deionized water until the pH value of the washing solution is 7.2, drain the free water of the above resin, and obtain the light yel...

Embodiment 3

[0039] In a 1L three-neck flask equipped with mechanical stirring, a spherical condenser, and a thermometer, add 50 g of gel-type chloromethylated polystyrene resin with a crosslinking degree of 2% (w%) (chlorine content is 5.15mmol / g) and 450 mL of dimethyl sulfoxide (DMSO). After the resin was fully swollen in DMSO for 5 hours, 57.2 g (566.3 mmol) of biguanide was added to the three-necked flask, and stirring was started. After the DMSO solution adjusted the alkalinity of the reaction solution to pH=11, it began to heat up, and when it reached 65 ° C, after 10 hours of heat preservation, sampling was carried out, and the residual chlorine content in the resin was determined to be 0.25 mmol / g, and the heating and stirring were stopped, and left to stand To room temperature, filter out the resin, wash the resin with a large amount of deionized water until the pH value of the washing solution is 6.8, drain the free water of the above resin, and obtain the light yellow spherical ...

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Abstract

The invention relates to a high-temperature-resistant guanidine-based strong-basic anion exchange resin, which has a strong base exchange capability of 1.5-3.2 mmol / g based on N atom. The synthesis method of the high-temperature-resistant guanidine-based strong-basic anion exchange resin comprises the following steps of: dissolving a chloromethylated polystyrene resin and an organic guanidine in a solvent, and carrying out chemical reaction on a chloromethyl group of the resin frame and a guanidyl group for bonding the small molecule organic guanidine to the resin frame so as to obtain the resin. The invention has the advantages that: the high-temperature-resistant guanidine-based strong-basic anion exchange resin has a novel structure, and the heat stability is improved because the heat stability of the guanidyl group is improved; and compared with traditional production processes of quaternary ammonium anion exchange resin, the synthesis process of the resin is simple, has no obvious change in production cost, and has important significance in industrial mass production and application. The resin has a potential application prospect in ion exchange, catalysis reaction, high-purity water preparation, decoloring of natural extracts, removing of ionic impurities from environmental wastewater and the like in a high temperature environment.

Description

technical field [0001] The invention relates to an anion exchange resin and a synthesis method thereof, in particular to a high-temperature-resistant guanidine-based strong base anion exchange resin and a synthesis method thereof. Background technique [0002] Strong base anion exchange resins are widely used in water treatment, substance purification, concentration, separation, transformation of ionic composition of substances, decolorization of substances and catalysts and other fields. Strong base ion exchange resin is a kind of traditional adsorption and separation material, which is widely used in many industrial production and scientific and technological fields. Its structure contains hydroxyl benzyltrialkylammonium (quaternary ammonium) The chloromethyl group connected to the ring reacts with a molecule of tertiary amine. Due to the structural characteristics of the quaternary ammonium group, the Hoffmann (Hoffmann) degradation side reaction is very easy to occur wh...

Claims

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Application Information

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IPC IPC(8): C08F12/08C08F8/32B01J41/14
Inventor 王春红施荣富昝慧宁张丽轩
Owner NANKAI UNIV
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