What should be noted when using a deionized water system?

Why isn’t anyone helping? :handshake

In fact, equipment manufacturers are required to provide these precautions. Generally, they must also provide operating procedures, which include a dedicated section addressing a range of issues related to resins. Reputable manufacturers even provide emergency response plans or methods.

Hehe, I just arrived at this factory as well; I don’t have any information available, and I can’t find the manufacturer of that equipment either. I really don’t understand much about it. Please help me out. I just replaced the resin – what should I pay attention to? How do I perform resin maintenance?

Hehe, I just arrived at this factory as well; I don’t have any information available, and I can’t find the manufacturer of that equipment either. I really don’t understand much about it. Please help me out. I just replaced the resin – what should I pay attention to? How do I perform resin maintenance?

The internet speed is a bit slow; there are too many entries. Please ask the moderator to delete the duplicates. Thank you

Before use, the new ion exchange resin can be washed thoroughly with large amounts of clean water until the water discharged is colorless, odorless, and free of foam. It usually takes half an hour to clean. If a strongly acidic cation resin is used in a sodium ion exchanger to produce soft water, it can be soaked repeatedly in 10% saline (NaCl) – using fresh saline each time – for 3 to 4 times, with each soaking lasting more than 1 hour; after that, it can be fully regenerated and put to use. For the production of pure water, strongly acidic cation exchange resins should be soaked successively in 4–5% HCl and washed, then in 4% NaOH and washed again, followed by soaking in 4–5% HCl and washing once more; each soaking period should last no less than 1 hour. After complete regeneration, the resins can be used. The strong-base anion exchange resin is successively soaked in 4% NaOH and washed, soaked in 4–5% HCl and washed, and then soaked in 4% NaOH and washed; each soaking period lasts no less than 1 hour. After complete regeneration, it is ready for use. To achieve good pretreatment results, the resin to be treated can be placed in an exchange column. The saline solution (or acidic or alkaline solution) used for treatment is prepared at a concentration of 4–6%, with a volume that is 2–3 times that of the resin. Depending on the type and sequence of treatment solutions, this solution is passed through the resin layer over a period of about one hour; thereafter, the resin is fully regenerated and ready for use. Causes and prevention methods of resin contamination Causes of resin contamination During use, ion exchange resins are invaded by harmful impurities present in the raw water, such as suspended solids, colloids, organic substances, microorganisms, as well as heavy metals and oxides dissolved in water, which significantly degrade the performance of the resins. In one case, the exchange pores within the resin are blocked by the aforementioned impurities, the surface is covered, or the exchange groups are occupied, resulting in a significant reduction in the resin’s exchange capacity and making regeneration difficult. In another case, harmful impurities break the cross-linked structure of the resin or degrade the exchange groups, causing damage to the resin; the fragments are carried away by water, and the exchange capacity decreases. Prevention and control of resin contamination: Control of the quality of the incoming water: 1. Water turbidity: ≤5 mg/L for cross-flow regeneration exchangers, ≤2 mg/L for counter-flow regeneration exchangers ； 2. Residual active chlorine: free chlorine ≤ 0.1 mg/L ； 3. Chemical Oxygen Demand (COD) ≤ 1 mg/L ； 4. Iron content: ≤0.3 mg/L for mixed-bed exchangers, and ≤0.1 mg/L for hybrid bed exchangers. After every 10 to 20 cycles of operation, the resin is checked for contamination, and if contamination is detected, it is treated using appropriate methods. Strengthen the anti-corrosion treatment of equipment and conduct regular anti-corrosion inspections; any anti-corrosion issues detected should be resolved promptly, as the equipment must not operate with defects. Treatment of iron contamination: The resin can be regenerated dynamically using 10% HCl; thereafter, it should be soaked in 10% HCl for 5–8 hours ； Alternatively, soak it in 10% NaCl + 1% disodium EDTA for 6–8 hours. Treatment of active residual chlorine contamination: An activated carbon filter can be installed before the exchanger, or sodium sulfite can be added to the water. Treatment of organic pollutants: Resins contaminated by organic substances can be treated using a mixture of NaCl and NaOH. To improve the treatment efficiency, the temperature of the treatment solution can be maintained at 40–50°C. The resin contaminated by organic matter can also be soaked in a NaCl + sodium hypochlorite solution. For raw water containing organic substances, it should be filtered through an activated carbon filter to minimize organic contamination as much as possible. How to store ion exchange resin? Storage of new resin: Maintain the moisture content of the resin: The resin is saturated with water at the time of production. During transportation, care must be taken to ensure that the packaging is sealed and intact, in order to prevent the resin from drying out due to loss of moisture. Resin should not be stored for too long. If not used for over a year, keep the packaging intact. It is best to store it directly in a container filled with a 10% NaCl solution and properly preserved. Prevent overheating or freezing: The ideal storage temperature for resin is between 5 and 20°C; it should not be lower than 0°C, to avoid water within the resin freezing and causing the resin to crack. In the northern regions, it is necessary to avoid transporting resin in winter. If it is necessary to transport and store the resin at low temperatures, it can be placed in saturated salt water ； Resin should not be placed near high-temperature equipment or in areas exposed to direct sunlight. When the storage temperature is too high, rapid microbial growth can easily cause the resin to become contaminated and moldy. Prolonged exposure to high-temperature environments can also lead to the degradation of the exchange groups in the resin, thereby affecting its exchange capacity and service life. Preventing resin contamination: When storing resin, it should be kept away from iron containers, strong oxidizing agents, oils, and organic solvents, to prevent the resin from becoming contaminated or degraded due to oxidation. Storage of old resin: Old resin refers to the resin that is installed in exchangers and needs to be out of use for an extended period due to certain reasons. It is advisable to store old resins by converting them to salt forms, that is, transforming cation exchange resins to sodium form and anion exchange resins to chloride form. The resin must not lose moisture during storage; if it is soaked in clean water, the water needs to be changed once a month. It is best to soak the resin in 10% saltwater to prevent the growth of microorganisms. At high temperatures, it is necessary to prevent the resin from molding and caking. The resin can be soaked in an aqueous formaldehyde solution at 1–1.5%. (When resuming use of the resin, be sure to rinse off the formaldehyde aqueous solution used for soaking.) ) When using resins of various types, be sure to keep the labels on the resin packaging intact; do not mix resins of different types together. Safety precautions to be observed when using resins: 1. When regenerating resins, it is often necessary to use dilute acidic or alkaline aqueous solutions. When diluting with concentrated alkali (or solid alkali), one must wear a plastic or rubber apron and gloves, as well as protective goggles and a mask. Similarly, when using concentrated acid (such as hydrochloric acid) for dilution, proper labor protection measures must be taken, and the operation should be carried out in a well-ventilated area. In the event that acid or alkali gets into the skin or eyes, it should be immediately rinsed with plenty of water. If redness, swelling, pain, or other symptoms occur, medical treatment should be sought promptly. 2. Do not touch the resin in the packaging with bare hands to avoid skin allergies. If you do come into contact with it, wash the area thoroughly with clean water. In case resin is accidentally ingested, immediate medical attention at a hospital is required. 3. Do not dispose of waste resin casually; place it in intact packaging containers and hand it over to a professional entity for incineration, so as to prevent environmental pollution. 4. Some resins may be treated with organic solvents during use; care must be taken regarding the safety of these solvents for humans and property. 5. Resins produce some by-products during the manufacturing process; users must determine on their own the types and quantities of these by-products that need to be removed for a specific application, as well as select appropriate techniques to ensure the desired purity level for use. 6. When using nitric acid or other strong oxidizing agents, an explosive reaction may occur due to mixing with the resin; when utilizing such oxidizing agents, the design of the equipment must take precautions to prevent sudden pressure increases, and it is advisable to consult those with relevant technical knowledge and experience. 7. Use the resin in strict accordance with the product technical parameters specified in the resin instruction manual; do not use it beyond the recommended limits.

The resin degradation you’re experiencing may be due to the resin being subjected to excessive pressure as a result of a large differential pressure between the inlet and outlet of the bed during later operation. Also, what is the diameter of your bed? What’s the airspeed? What is the color of the resin? How is the quality of the raw water? Are there any specific figures?

Reply to #8: Gossip Furnace. In the later stage, the pressure difference between the inlet and outlet is 1.5 Kg; the bed diameter is DN800. The raw water undergoes deionization after being filtered through manganese sand and activated carbon; the resin turns brown in color. No data. What is airspeed?

This post was last edited by Bagua Lu on 2011-3-8 at 13:34. A pressure difference of 1.5 kg/m3 is too high; a typical pressure difference is around 7 meters of water column. There isn’t any major issue with the process itself; the brown color of the resin indicates severe iron contamination. Space velocity refers to the ratio of flow rate to the cross-sectional area of the bed, and its unit is m/h; this value is usually around 20 m/h. If it’s too large, it increases the pressure drop across the bed; aged resin is prone to crushing, while new resin ages more rapidly as well. Additionally, the specific consumption during regeneration becomes higher. If the iron content in the raw water is high, it’s best to reactivate it at regular intervals.

Specifications of cationic resins: 001×7 resin, (732) resin, D001 resin, D002 resin, D113 resin. Introduction to cationic resins: These cationic resins appear as solid spherical particles, similar in shape to rapeseed seeds. The size of these particles generally ranges from 0.3 to 1.2 mm, with most falling within the range of 0.4 to 0.6 mm. The color ranges from golden yellow to orange-red. Cation resins are commonly used for boiler water softening. It’s tasteless in many places. Application areas of cationic resins: They are used in industries such as electricity, petroleum, chemicals, light industry, metallurgy, electronics and pharmaceuticals, food processing, as well as in water treatment and boiler systems for managing waste materials. Specifications of the recovered anion resins: 201×7 resin, (717) resin, D201 resin, D301 resin, D302 resin. Introduction to anion resins: These anion resins also appear as solid spherical particles, similar in shape to rapeseed seeds. The size of these particles generally ranges from 0.3 to 1.2 mm, with most falling within the range of 0.4 to 0.6 mm. The color ranges from white to light yellow. It is also often used for boiler water softening. Resin has a strong odor, a foul smell to it, making it easy to identify. Application areas of anionic resins: They are used in industries such as electricity, petroleum, chemicals, light industry, metallurgy, electronics and pharmaceuticals, food processing, as well as in water treatment and boiler systems for managing waste materials. For details, please contact by phone: 0316-5799130, 18831601819, Mr. Du