How To Activate Ion Exchange Resins

1, This method is applicable to the activation of anion and cation exchange resins when they are contaminated during the treatment of chromium plating wastewater using ion exchange method

2, Anion exchange resin can be activated in vitro. The amount of activation solution is 1-2 times the volume of the resin. The activation solution is prepared with sulfuric acid and sodium bisulfite with a concentration of 2.0-2.5MOL/L. The content of sodium bisulfite is 45G/L for gel type strong base anion resin and 28G/L for macroporous weak base anion resin. During activation, the resin is soaked in the activation solution overnight

3, Cation exchange resin can be activated in vivo. The amount of liquid used is twice the volume of the resin. The activation solution is prepared with hydrochloric acid with a concentration of 3.0MOL/L, passing through the resin layer at a flow rate of 1.2-4.0M/H, and then soaked in sulfuric acid with a volume of 1-2 times the resin volume and a concentration of 2.0-2.5MOL/L for more than 3 hours

The working principle and advantages and disadvantages analysis of ion exchange resin A material that combines ionic functional groups onto a resin (organic polymer) is called an "ion exchange resin" A resin with sulfonic acid on its surface is called a cation exchange resin, while a resin with quaternary ammonium ions is called an anion exchange resin. Due to its ability to effectively remove anions and cations from water, ion exchange resins are often used in the manufacturing process of pure and ultrapure water. Although functional groups on ion exchange resins can remove ions from raw water, over time, the saturation of functional groups leads to a decrease in deionization efficiency, resulting in water quality degradation. In addition, ion exchange resin itself is also an organic substance, which can be dissolved during use due to oxidation decomposition, mechanical rupture, and support outflow. In addition, charged organic matter can also be adsorbed by ion exchange resins, making them susceptible to contamination by organic matter. Some microorganisms, due to the negative charge on the surface of their bodies, are also adsorbed by cation exchange resins, making the resin surface a breeding ground for microorganisms and causing pollution of pure water. At the same time, the metabolites produced by microorganisms can also become a source of organic matter pollution. These are all areas that cannot be ignored when using ion exchange resins, which can cause water quality deterioration. Ion exchange resins that usually lose their ion removal ability (saturation) can be regenerated through the action of acid-base agents to achieve reuse. However, if the efficiency is poor due to the adsorption (pollution) of organic substances, the removal performance of the resin will decrease. In addition, there is a risk of ion exchange resin contamination depending on the quality of the chemical agents used for regeneration. Therefore, the ion exchange resin used in ultrapure water systems is almost impossible to regenerate.