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Preparation method of macroporous strong-alkaline anion exchange resin for removing nitrate in water

A technology of exchange resin and nitrate, applied in anion exchange, ion exchange, ion exchange water/sewage treatment, etc., can solve the problems of lack of efficient and cheap ion exchangers, achieve good development prospects and practical significance, good selectivity, The effect of long reaction times

Active Publication Date: 2015-06-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is a lack of efficient and cheap ion exchangers for nitrate removal at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Aggregation:

[0027] ⑴ Preparation of water phase: 232.85ml 2.5% polyvinyl alcohol (PVA) solution, 60.48ml gelatin solution with 2% mass fraction, 9.07g tricalcium phosphate, 3.02g sodium chloride, and 1‰ 9.07ml of methyl blue solution and 0.15g of EDTA were mixed uniformly for later use.

[0028] (2) Preparation of oil phase: Mix 80 mL of styrene, 4 mL of divinylbenzene, 0.8 g of benzoyl peroxide, and 67.2 mL of liquid paraffin for use.

[0029] ⑶Operation process: add the water phase to a 500ml three-necked flask with stirring, condenser and thermometer, open and stir at 200r / min, when the water bath is heated to 60℃, add the pre-prepared oil phase, increase the stirring speed by 400r / min, and stir After 15 minutes, the temperature is increased to 75°C for 2 hours; then to 80°C for 1 to 2 hours; and finally to 90°C to 95°C for 4 hours.

[0030] After the reaction, it was filtered with a standard sieve of 0.5 mm aperture to obtain a white beaded resin, which was washed w...

Embodiment 2

[0039] (1) Aggregation:

[0040] ⑴ Preparation of water phase: 253.94ml 2.5% polyvinyl alcohol (PVA) solution, 63.36ml 2% gelatin solution, 9.5g tricalcium phosphate, 3.17g sodium chloride, 1‰ Mix 9.5 ml of methyl blue solution and 0.16 g of EDTA for use.

[0041] (2) Preparation of oil phase: Mix 80 mL of styrene, 8 mL of divinylbenzene, 0.9 g of benzoyl peroxide, and 70.4 mL of liquid paraffin for use.

[0042] ⑶Operation process: add the water phase to a 500ml three-necked flask with stirring, condenser and thermometer, open and stir at 200r / min, when the water bath is heated to 60℃, add the pre-prepared oil phase, increase the stirring speed by 400r / min, and stir After 15 minutes, the temperature is increased to 75°C for 2 hours; then to 80°C for 1 to 2 hours; and finally to 90°C to 95°C for 4 hours. After the reaction, it was filtered with a standard sieve of 0.5 mm aperture to obtain a white beaded resin, which was washed with a large amount of hot water at 70°C to 85°C, 1mol...

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Abstract

The invention discloses a preparation method of styrene macroporous strong-alkaline anion exchange resin for removing nitrate in water. Styrene, divinyl benzene, benzoyl peroxide, liquid paraffin, polyvinyl alcohol, gelatin, methylene blue, dichloromethane, 1,4-bis(chloromethoxy)butane, anhydrous tin tetrachloride and triethylamine are used as main raw materials; the macroporous strong-alkaline anion exchange resin is prepared through suspension polymerization reaction, chloromethylation reaction and amination reaction. The preparation comprises the following steps: synthesis of styrene divinyl benzene cross-linked polymer by the suspension polymerization method, chloromethylation reaction of styrene divinyl benzene cross-linked polymer, and amination reaction of chloromethylated styrene divinyl benzene cross-linked polymer. The particle size of the prepared resin is 0.5-1.5mm; the resin has the advantages of uniform pore distribution, strong adsorbability against nitrate, high selectivity on nitrate and the like; the physicochemical properties of the resin are good. The resin can be applied to the nitrate removal treatment process of water, and has good development prospect and practical significance.

Description

Technical field [0001] The invention belongs to the preparation process of ion exchange resin, and specifically relates to a preparation method of macroporous strong basic styrene anion exchange resin for removing nitrate in water. Background technique [0002] After nitrate enters the human body, it is easily reduced to nitrite to cause methemoglobinosis, and it also has the risk of causing cancer in the human body. In addition, nitrogen is one of the important nutrient sources that cause eutrophication of water bodies. Therefore, how to economically and efficiently remove nitrogen in water has always been one of the current engineering problems for water quality safety and water environmental protection. At present, the main methods of treating wastewater contaminated by nitrates are: ion exchange, biological denitrification, chemical reduction, reverse osmosis and electrodialysis. Biological denitrification has low efficiency in the treatment of nitrates, especially low-conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F212/36C08F8/24C08F8/32C08J9/26B01J41/14C02F1/42
Inventor 任勇翔叶媛媛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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