Ion exchange resin regeneration method

You can consult the resin manufacturer in detail for this! ! They should be able to provide such technical support!

I have used Rohm and Haas resins before, but they were of the large-pore weak-acid type. It is recommended to consult the resin manufacturer in detail! There should be a result! :lol

Regular regeneration process: After being used for a certain period of time, ion exchange resin (IONRESIN) reaches a state where the impurities it has absorbed are nearly saturated; at this point, regeneration is necessary. Chemical agents are used to wash away the ions and other impurities absorbed by the resin, thereby restoring its original composition and properties. In practical applications, in order to reduce regeneration costs, it is necessary to control the amount of regenerant used appropriately so that the properties of the resin are restored to the most economically viable level; typically, the degree of property restoration is maintained at 70–80%. To achieve a higher level of regeneration, the regeneration dose must be increased significantly, resulting in a decrease in the utilization efficiency of the regenerator. 　　The regeneration of resins should involve selecting appropriate regeneration agents and operating conditions based on the type and properties of the resins, as well as economic considerations. 　　The regeneration properties of resins are closely related to their type and structure. The regeneration of Resinex strong acidic and strong basic resins is relatively difficult, requiring a regeneration dose that is considerably higher than the theoretical value ； Weakly acidic or weakly basic resins, on the other hand, are easier to regenerate, requiring only a slightly higher amount of regeneration agent than the theoretical value. Furthermore, macroporous resins with low cross-linking degree are easier to regenerate, while gel-type resins with high cross-linking degree require a longer regeneration time. Compiled by Jiangsu Secosith Resin Co., Ltd. www.ionresin.com The type of regenerating agent should be selected based on the ion type of the resin, with acids, bases, or salts that are relatively inexpensive being chosen appropriately. For example, sodium-type strongly acidic cation resins can be regenerated using a 10% NaCl solution, with the amount of NaCl used being twice their exchange capacity (117 g of NaCl per liter of resin) ； Hydrogen-type strongly acidic resins are regenerated with strong acids; when using sulfuric acid, care must be taken to prevent calcium adsorbed by the resin from reacting with the sulfuric acid to form calcium sulfate precipitates. To this end, it is advisable to first pass in 1–2% dilute sulfuric acid for regeneration. 　　Chloride-type strongly basic resins are primarily regenerated using NaCl solutions; however, the addition of a small amount of alkali helps to dissolve and remove the pigments and organic substances adsorbed by the resins. Therefore, an alkaline salt solution containing 10% NaCl + 0.2% NaOH is generally used for regeneration. The typical amounts used are 150–200 g of NaCl per liter of resin, along with 3–4 g of NaOH. OH-type strong alkaline anion resins are regenerated using a 4% NaOH solution. 　　The chemical reaction during the regeneration of resins of the Xylosulfone type is the reverse reaction of the original exchange adsorption of the resin. According to the principles of chemical reaction equilibrium, increasing the concentration of one of the substances involved in a chemical reaction promotes the reaction to proceed in the direction of the other substance; therefore, increasing the concentration of the regeneration solution accelerates the regeneration reaction and enables a higher level of regeneration to be achieved. 　　To accelerate the regeneration reaction, the regeneration liquid is usually heated to 70–80°C first. Its flow rate through the resin is generally 1–2 BV/h. A method of starting fast and then slowing down can also be used to fully utilize the effectiveness of the regenerant. The regeneration time is about one hour. Subsequently, the resin is rinsed with soft water in the flow direction for about an hour (with a water volume of approximately 4 BV). After the rinse water has been drained, backwashing with water is carried out until the wash effluent is colorless and free of turbidity. Compiled by Jiangsu Sikecaisi Resin Co., Ltd. www.ionresin.com Some resins require pH adjustment after regeneration and backwashing. Since the regeneration liquid often contains alkali, the resin remains alkaline even after washing following regeneration. Some decolorizing resins (especially weakly basic resins) are suitable for operation in a slightly acidic environment. At this point, dilute hydrochloric acid can be added to lower the pH of the resin to around 6, followed by one wash with water and one backwash. After being used for an extended period of time, (IONRESIN) resin becomes contaminated as some of the impurities it adsorbs – particularly large molecular organic colloidal substances – cannot be removed through conventional regeneration processes; these impurities accumulate over time and reduce the efficiency of the resin. A special method must be used at this time. For example, if cationic resins are contaminated by nitrogen-containing amphoteric compounds, they can be treated with a 4% NaOH solution to dissolve and remove them ； When anionic resins are contaminated with organic matter, the NaOH concentration in the alkaline salt solution can be increased to 0.5–1.0% to dissolve the organic matter. Compiled by Jiangsu Secosys Resin Co., Ltd. www.ionresin.com II. Special regeneration treatments For resins that are heavily contaminated, they can be treated repeatedly using acidic or alkaline salt solutions. For example, organic substances can first be dissolved using a 10% NaCl + 1% NaOH alkaline salt solution, while inorganic substances can be dissolved using 4% HCl or separately using 10% NaOH and 1% HCl. After that, the mixture is treated again with 10% NaCl + 1% NaOH, at a temperature of around 70°C. 　　If the effect of the above treatment is not satisfactory, an oxidation method can be used. That is, after washing the resin with water, a sodium hypochlorite solution at a concentration of 0.5% is passed through it, with a flow rate controlled at 2–4 BV/h and a volume flow of 10–20 BV; thereafter, it is washed with water again and then treated with saline. It should be noted that oxidation treatment may oxidize the bonding bonds of macromolecules in the resin structure, leading to degradation of the resin, increased swelling, and greater susceptibility to cracking; therefore, it is not suitable for frequent use. Oxidation treatment is usually carried out after 50 cycles. Since chlorinated resins have strong oxidation resistance, the resin should be treated with salt water to become chlorinated before oxidation treatment; this also helps to prevent changes in pH during the treatment process and ensures a more stable oxidation reaction.

The most high-performance ion exchange resin http://www.shuzhi.cn

We have consulted the supplier; since there are no cases of this resin being used in the same field, the supplier was unable to provide a definite opinion. However, by referring to its use in other fields, we have decided to conduct experiments.

Nanofiltration units can be considered to separately purify and recover acids and bases. It can generate significant economic value and environmental benefits. Generally, recycled hydrochloric acid with a high concentration (greater than 1%) is collected and purified using nanofiltration to remove more than 95% of calcium, magnesium ions, pigments, and other large-molecule impurities, with a recovery rate of over 80%. It is also possible to collect recycled alkali waste solutions with a high concentration (greater than 1%), purify them using nanofiltration to remove more than 93% of macromolecular impurities such as pigments, with a recovery rate of over 80% as well. The purified dilute hydrochloric acid can be supplemented with some concentrated hydrochloric acid for use in the next regeneration process. The purified weak alkaline solution can also be reused for the next regeneration by simply adding some liquid alkali to it. I saw on Baidu Wenku, at https://wenku.baidu.com/view/83a9ef9a81eb6294dd88d0d233d4b14e84243e54.html, that they offer equipment rental services. It can be used without any investment. But it seems there are requirements regarding the processing volume. It’s not very cost-effective when the quantity is too small.