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Synthetic method of high temperature-resistant strongly basic anion exchange resin

A technology of exchange resin and synthesis method, which is applied in the direction of anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of limiting the application range of strong base anion exchange resin, loss of activity of strong base anion exchange resin, etc., and achieve simple production process , good thermal stability and high application value

Inactive Publication Date: 2014-04-30
NINGBO ZHENGGUANG RESIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use temperature of the traditional strongly basic anion exchange resin prepared by trimethylamine is limited to below 60°C. When the use temperature exceeds the upper limit, the quaternary ammonium group is prone to Hoffman (Hoffman) degradation reaction. The way is that the ammonium group falls off and the strong base group is converted into a weak base group, which leads to the loss of activity of the strong base anion exchange resin, which limits the application range of the strong base anion exchange resin

Method used

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  • Synthetic method of high temperature-resistant strongly basic anion exchange resin
  • Synthetic method of high temperature-resistant strongly basic anion exchange resin
  • Synthetic method of high temperature-resistant strongly basic anion exchange resin

Examples

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Effect test

Embodiment 1

[0016] Embodiment 1: a kind of synthetic method of high temperature resistant strongly basic anion exchange resin, it is characterized in that: adopt cross-linked polystyrene white ball as skeleton, adopt chloromethyl ether to connect on white ball skeleton by Fourier reaction as alkylating agent Benzyl chloride, and then carry out amination reaction with alkylamine containing long carbon chain to obtain strong basic anion exchange resin.

[0017] The cross-linked polystyrene white ball skeleton is gel type or macroporous type, and the cross-linking degree is 2%~20%. The chlorine content of the cross-linked polystyrene white ball skeleton is 5%~25% after chloromethylation. Adopt the tertiary amine that contains long carbon chain alkyl group to carry out amination reaction, obtain the strongly basic anion exchange resin containing long carbon chain alkylammonium group, its structural formula is as follows:

[0018]

[0019] Among them, P is a cross-linked polystyrene skelet...

example 1

[0025] Example 1: In a 1000ml three-neck flask equipped with mechanical stirring, a spherical condenser and a thermometer, add 100g of gel-type polystyrene white balls with a cross-linking degree of 7% and 600ml of chloromethyl ether, start stirring, and expand at room temperature 4h. After the expansion is completed, add 30g of zinc chloride into the three-neck flask, heat it to 40°C in a water bath, and keep it warm for 15h. After the reaction is completed, use a vacuum pump to drain the mother liquor, take an appropriate amount of methanol and wash it several times, measure the chlorine content of the chlorine ball to be 17%, add 300ml of methylal to expand for 1 hour, then add 200ml of triethylamine, and heat to 40 in a water bath. ℃, keep warm for 20h, drain the mother liquor after the reaction, wash with pure water to pH=7, the measured strong base exchange capacity of the resin is 3.40mmol / g (dry), and the water content is 50.8%. Put this resin into a stainless steel t...

example 2

[0026] Example 2: The resin synthesis steps are the same as Example 1. The heat stability test of the resin is to place the high temperature resistant resin in a stainless steel tank filled with pure water, seal the stainless steel tank and place it in a constant temperature water bath at 90°C for 80 hours, and take a sample Re-measure the imposed exchange capacity of the resin to be 3.38mmol / g (dry), and calculate the loss rate of resin strong alkali exchange capacity to be 0.5%.

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Abstract

The invention relates to a synthetic method of strongly basic anion exchange resin, and particularly relates to a synthetic method of high temperature-resistant strongly basic anion exchange resin containing a long-carbon chain alkylamine group. A crosslinked polystyrene white ball is adopted as a skeleton, chloromethyl ether is adopted as an alkylating reagent to graft benzyl chloride on the white ball skeleton by Fourier reaction, and amination reaction is carried out on the long-carbon chain alkylamine, so as to obtain the strongly basic anion exchange resin. The synthetic method has the advantages that the strongly basic anion exchange resin with relatively high heat stability can be synthesized by adopting a simple production technology and cheap materials, so that the strongly basic anion exchange resin can be applied to unit operation in a high-temperature environment, such as preparation of super-pure water in a semiconductor industry, high-temperature condensate refined treatment of a power plant, removal of silicic acid of water in a high-pressure boiler, and use under a high-temperature condition as a catalyst.

Description

technical field [0001] The invention relates to a method for synthesizing a strong basic anion exchange resin, in particular to a method for synthesizing a high temperature resistant strong anion exchange resin containing long carbon chain alkyl ammonium groups. Background technique [0002] 1. Soviet patent SU675056 announced that introducing 2% 2-mercaptobenzimidazole into chloromethyl crosslinked polystyrene resin, and then reacting with trimethylamine to prepare strong basic anion exchange resin can improve the thermal stability of the resin , the weight loss of its chlorine type is 4.5% when heated to 300°C, while the weight loss of general anion resin is 10% at 150°C. [0003] 2. Japanese patent JP0724334 disclosed a high temperature resistant anion exchanger used as a gas adsorbent in 1995, which is characterized in that there is no hydrogen atom on the benzene ring of polystyrene resin and the methylene α-C of the quaternary ammonium group. JP10045830, JP10137752, J...

Claims

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Application Information

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IPC IPC(8): C08F12/08C08F8/44C08F8/24B01J41/12B01J41/13
Inventor 沈建华苏振勇周闽徐斌钟轶泠郭琰辉
Owner NINGBO ZHENGGUANG RESIN CO LTD
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