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What Are The Precautions For Cation Exchange Resins

Jul 20, 2020

What are the precautions for cation exchange resin?


1. Ion exchange resin contains a certain amount of water and should not be stored in the open air. During storage and transportation, it should be kept moist to avoid drying out and breaking the resin. If the resin is dehydrated during storage, it should be soaked in concentrated brine (10%) first. Then dilute it gradually, and don't put it directly into the water, so as to prevent the resin from swelling and breaking.


2. During storage and transportation in winter, it should be kept in a temperature environment of 5-40℃ to avoid over-cooling or over-heating, which will affect the quality. If there is no insulation equipment in winter, the resin can be stored in salt water. The concentration of salt water can be adjusted according to the temperature. Depends.


3. Industrial products of ion exchange resin often contain a small amount of low polymer and unreacted monomers, as well as inorganic impurities such as iron, lead, and copper. When the resin is in contact with water, acid, alkali or other solutions, the above Substances will be transferred into the solution and affect the quality of the effluent. Therefore, the new resin must be pretreated before use. Generally, the resin is fully expanded with water first, and then the inorganic impurities (mainly iron compounds) can be used 4-5 % Of dilute hydrochloric acid is removed, organic impurities can be removed with 2-4% dilute sodium hydroxide solution, and it can be washed to near neutral. If used in medical preparation, it must be soaked in ethanol.


4. When the resin is in use, prevent contact with metal (such as iron, copper, etc.) oil, organic molecular microorganisms, strong oxidants, etc., so as not to reduce the ion exchange capacity or even lose its function. Therefore, the resin must be irregularly adjusted according to the situation. Activation treatment, the activation method can be determined according to the pollution situation and conditions. Generally, the cation resin is easy to be contaminated by Fe during softening. It can be soaked in hydrochloric acid and then gradually diluted. Soak or rinse the mixed solution. If necessary, use 1% hydrogen peroxide solution to soak for a few minutes. In addition, alternative acid-base treatment, bleaching, alcohol treatment and various sterilization methods can also be used.


  5. Pretreatment of new resin: Industrial products of ion exchange resin often contain a small amount of oligomers and monomers that have not participated in the reaction, as well as inorganic impurities such as iron, lead, and copper. When the resin comes into contact with water, acid, alkali or other solutions, the above-mentioned substances will be transferred into the solution and affect the quality of the effluent. Therefore, the new resin must be pretreated before use. Generally, the resin is swelled with water first, then the inorganic impurities (mainly iron compounds) can be removed with 4-5% dilute hydrochloric acid, and the organic impurities can be removed with 2-4% dilute sodium hydroxide solution and washed until it is nearly neutral. can.

Source:https://www.up-resin.com/

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