Food Grade Resin/Drinking Water Grade/High Quality Brand Name Anion Exchange Resin

• CAS No.: 9050-97-9
• Color: White
• Appearance: Transparent Round Particles
• Transport Package: 25kg/Bag
• Trademark: henghao
• Origin: China
• HS Code: 391400
• Production Capacity: 999999

Product Description

       Anion exchange resin refers to an ion exchange resin containing basic groups in the molecule. It is alkaline in solution and can exchange anions in solution with its hydroxyl ions. It can be divided into three categories: strong alkali, weak alkali and strong and weak alkali mixture.


      For water treatment (including hard water softening, high pressure boiler water, deionized water, injection water, seawater desalination, etc.) removal of harmful anions (such as cyanide ions, thiocyanate ions, etc.) in wastewater, extraction of rare elements, and amino acids , separation of vitamin C, tartaric acid, citric acid, etc.



basic concept
      The ion exchange process is a reversible chemical reaction between the ions in the liquid phase and the ions in the solid phase. Ion exchange solid adsorption, in order to maintain the electrical neutrality of the aqueous solution, so the ion exchange solid must release equivalent ions back into the solution.



specific classification
The exchange capacity of ion exchange resin can be divided according to the characteristics of its exchange capacity:

       1. Strong base type anion exchange resin: mainly contains strong reactive groups such as -N+(CH3)3 with tetrahedral ammonium salt functional group, in the form of hydroxide, the hydroxyl in -N+(CH3)3OH- The ions can be released quickly for exchange, and the strong base type anion exchange resin can exchange and remove all anions.

       This type of resin contains strong basic groups, such as quaternary ammonium group (also known as quaternary amine group) -NR3OH (R is a hydrocarbon group), which can dissociate OH- in water and show strong basicity. The positively charged groups of this resin can adsorb and combine with anions in the solution, resulting in anion exchange.

       This resin is highly dissociative and works well at various pHs. It is regenerated with a strong base such as NaOH.

       2. Weak base type anion exchange resins: These resins contain weak base groups, such as primary amine groups (also known as primary amine groups)-NH2, secondary amine groups (secondary amine groups)-NHR, or tertiary amine groups (tertiary amine group)-NR2, they can dissociate OH- in water and are weakly basic. This resin in most cases adsorbs the entire other acid molecules in solution. It can only work under neutral or acidic conditions (such as pH1~9). It can be regenerated with Na2CO3 and NH4OH.

      3. Adsorption of anions

The general order of adsorption of inorganic acid radicals by strongly basic anion resins is:

SO42-> NO3-> Cl-> HCO3-> OH-

The general order of adsorption of anions by weakly basic anion resins is as follows:

OH-> citrate 3-> SO42-> tartrate 2-> oxalate 2-> PO43-> NO2-> Cl-> acetate-> HCO3-Fold





Keeping water The ion exchange resin contains a certain amount of water and should not be stored in the open air. It should be kept moist during storage and transportation to avoid air-drying and dehydration, which will break the resin. If the resin is dehydrated during storage, it should be soaked in concentrated salt water (25%) first. Then gradually dilute it, do not put it directly into water, so as to prevent the resin from rapidly expanding and breaking. Keeping the temperature During storage and transportation in winter, it should be kept in a temperature environment of 5-40 °C to avoid overcooling or overheating, which will affect the quality. If there is no insulation equipment in winter, the resin can be stored in salt water. The salt water concentration Depends. The industrial products of impurity removal ion exchange resin often contain a small amount of low polymers and unreacted monomers, as well as inorganic impurities such as iron, lead, copper, etc. When the resin is in contact with water, acid, alkali or other solutions, the above The substance 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. Then, the inorganic impurities (mainly iron compounds) can be used for 4-5 % dilute to remove, organic impurities can be removed with 2-4% dilute  solution, and wash until nearly neutral. If used in pharmaceutical preparation, it must be soaked in ethanol. Periodically activate the resin during use to prevent contact with metal (such as iron, copper, etc.) oil stains, organic molecular microorganisms, strong oxidants, etc., so as not to reduce the ion exchange capacity or even lose its function. The activation method can be determined according to the pollution situation and conditions. Generally, the cation resin is susceptible to Fe pollution during softening, and it can be soaked in  and then gradually diluted. Soak or rinse in NaOH mixed solution. If necessary, soak in 1% solution for several minutes. Others can also use acid-base alternation treatment, bleaching treatment, alcohol treatment and various sterilization methods.