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ION EXCHANGE RESINS

ION EXCHANGE RESINS

  • How to prevent resin pollution? How to deal with the contaminated resin?
    • 2022-12-07

    What is the cause of resin contamination? The ion exchange resin is invaded by the suspended solids, colloids, organics, microorganisms, heavy metals, oxides and other harmful impurities dissolved in the water during use, which makes the performance of the resin significantly worse. In one case, the exchange capacity of the resin is significantly reduced and regeneration is difficult due to the bl...

  • Filling and Pretreatment of Anion and Cation Resins in Mixed Bed
    • 2022-12-05

    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...

  • How to pretreat anion exchange resin?
    • 2022-12-02

    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 ...

  • How to pretreat cation exchange resin?
    • 2022-11-30

    1. Pretreatment of cation exchange resin: 1.1 After the cation resin is filled, backwash shall be carried out first to ensure 80% backwash expansion rate to remove impurities and fine resin particles until the backwash effluent is clear, colorless, tasteless and foam free. 1.2. Fill 3-4% HCl solution, 4m/h, when the outlet concentration reaches 1.5-2%, stop filling and soak for more than 8 hours, ...

  • How to clean ion exchange resin ?
    • 2022-11-28

    Before using the ion exchange resin purchased in the market, in order to prevent impurities in the resin from polluting the water quality, the resin needs to be pretreated. The following steps are for pretreatment: 1. First, clean the resin with hot water. The cation resin can be cleaned with 70-80 ℃ hot water. The heat resistance of the anion resin is poor. Generally, 50-60 ℃ hot water is used. T...

  • What is the crosslinking degree of ion exchange resin?
    • 2022-11-23
    What is the crosslinking degree of ion exchange resin?

    Crosslinking degree is one of the important properties of styrene resin. It is the network structure of the framework of ion exchange resin polymerized by various organic materials, expressed in percentage. Crosslinking degree refers to the mass percentage of divinylbenzene (commonly known as "crosslinking agent") contained in styrene resin. That is, if the crosslinking degree=divinylbenzene mass/...

  • Ion exchange equilibrium and ion exchange selectivity
    • 2022-11-18
    Ion exchange equilibrium and ion exchange selectivity

    The separation function of ion exchange resin for mixed ions (including inorganic ions and organic ions) is based on its ion exchange selectivity. In a closed system, the fixed ion (A) of the ion exchange resin exchanges with the ion (B) in the solution, and can reach equilibrium after a certain time. The selectivity of ion exchange resin is affected by many factors, such as the nature of chemical...

  • What is ion exchange reaction?
    • 2022-11-17

    Ion exchange resins are cross-linked polymer compounds containing ionizable groups and insoluble in any solvent. Their separation and purification of substances are mainly achieved through ion exchange reaction. Ion exchange reaction usually refers to the ion exchange reaction between ion exchange resin and ions in solution. With different physical and chemical structures or different ionic system...

  • Basic types of ion exchange resins
    • 2022-11-10

    (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...

  • Synthesis of special ion exchange resin(II)
    • 2022-11-09

    2、 Amphoteric resin Amphoteric resin is a kind of ion exchange resin with cation and anion groups in the same resin particle. The two groups in this kind of resin are close to each other, which can combine with each other to meet the ions in the solution, and can exchange ions with cation and anion at the same time. After saturation, only a large amount of water washing is needed to regenerate the...

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