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Synthesis of Anion Exchange Resin (III)
2. Synthesis of strong basic anion exchange resin Among anion exchange resins, the yield of quaternary ammonium based strong alkaline resin is the largest. The main variety is gel type resin containing one N+(CH3) 3, with a crosslinking degree of 7 or 8, called strong base type I. Another ion exchange resin containing one N+(CH3) 2CH2CH2OH group is called strong base II. Strong basic anion exchang...
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Synthesis of Anion Exchange Resin (IV)
3. Synthesis of weakly basic anion exchange resin Chloromethylstyrene divinylbenzene copolymer can be aminated with many amines, and the aminated product with primary amine and secondary amine is weak base anion exchange resin. The hydration ability of weak base group is slightly poor, and the expansion in alkaline solution is also small, so the amination reaction can be faster. Especially, the ma...
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Synthesis of polycondensation ion exchange resin(III)
3、 Anion exchange resin There are two main routes for the synthesis of polycondensation anion exchange resin, one is the polycondensation of aromatic amines or aromatic amines and fatty polyamines with formaldehyde; The other is polycondensation of polyamine and epichlorohydrin. The hydrochloric acid solution of m-phenylenediamine and formaldehyde is dispersed and suspended in the mixed medium of ...
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Basic types of ion exchange resins
(1) Strong acid cation resin This kind of resin contains a large number of strong acidic groups, such as sulfo SO3H, which is easy to dissociate H+in solution, so it is strongly acidic. After the resin is dissociated, the negative group contained in the body, such as SO3 -, can adsorb other cations in the bound solution. These two reactions make the H+in the resin exchange with the cation in the s...
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Common faults of ion exchanger
1. Quartz sand cushion is in disorder. When the quartz sand cushion is selected at the bottom of the exchanger, the quartz sand layer will be caked due to improper backwashing operation or fouling; If the backwash water is flushed out locally, the quartz sand cushion will be disordered. The center of the dome shaped perforated plate under the quartz sand cushion shall not be perforated, so as to p...
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How to pretreat anion exchange resin?
2. Pretreatment of anion resin: 2.1 After the anion exchange resin is filled, backwash shall be carried out first to ensure 80% backwashing expansion rate to remove impurities and fine resin particles until the backwashing effluent is clear. 2.2 Feed 2-3% NaOH solution at a flow rate of 4m/h. When the outlet concentration reaches 1.5-2%, stop feeding and soak for more than 8 hours, and then rinse ...
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Filling and Pretreatment of Anion and Cation Resins in Mixed Bed
The specific operations are as follows: Clean the bed and put water 1-2 meters deep (ensure that the water surface is higher than the resin layer): 1. The design height shall be filled with resin (the final height of resin shall be subject to re ecology). 2. After installing the cation exchange resin, backwash to make the resin surface smooth, and then install the anion exchange resin; Two steps h...
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Application of ion exchange resin in food industry
Ion exchange resins are used in the food industry for a variety of applications. They can be used to remove heavy metals, salts, and other impurities from food products. They can also be used to separate components of food products such as proteins, carbohydrates, and fats. Additionally, Strong acid cation exchange resin and weak base anion exchange resins can be used to adjust the pH of food prod...
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Development of ion exchange resins in the United States
Ion exchange resins have been developed in the United States since the 1950s. Early research focused on developing cation exchange resins for water softening and deionization applications. The first commercial ion exchange resin was introduced in 1956 by Dow Chemical Company. Since then, ion exchange resins have been used in a variety of applications, including water treatment, food processing, ph...
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