Resin Storage and Transportation Technology

1. For long-term storage of ion exchange resins, or when storing them in equipment that is not in use for an extended period, strong resins should be converted to their salt form, while weak resins can be converted to their corresponding hydrogen form or free amine form, or vice versa, to maintain resin stability. They should then be regularly immersed in clean water. If water needs to be drained from equipment that is not in use, it should be sealed to prevent moisture loss from the resin.

2. Ion exchange resins contain a certain amount of equilibrium moisture and should be kept moist during storage and transportation to prevent dehydration. Resin should be stored indoors or covered, with an ambient temperature ideally between 5-40 degrees Celsius. Bagged resins should be kept away from direct sunlight and heating devices such as boilers and heaters to prevent dehydration.

If dehydration is observed in the resin, do not place it directly in water, as this will cause the dry resin to swell rapidly and break. Depending on the degree of dehydration, slowly add approximately 10% saline solution to the resin, soak for several hours, and then gradually dilute with clean water.

3. When the ambient temperature is 0 degrees Celsius or below, to prevent the resin from cracking due to internal moisture freezing, proper insulation measures should be taken. Alternatively, depending on the temperature, the resin can be stored in saline solutions of varying concentrations to prevent freezing. If the resin is found to be frozen, it should be allowed to thaw slowly and naturally; never apply mechanical force to the resin.

4. For resin stored in the exchanger for extended periods without use, to prevent irreversible contamination by microorganisms (such as algae and bacteria), the resin must be thoroughly backwashed before shutdown to remove suspended matter accumulated during operation. Regular flushing and water changes are necessary. Alternatively, after thorough backwashing, the following measures can be taken:

Anion resin: Pass a 10% NaCl + 2% NaOH mixture (3 times the resin volume) through the resin bed twice, allowing it to stand for several hours each time, then drain it. If necessary, rinse the resin motor with a 0.2% hydrogen peroxide solution (2 times the resin volume) before restarting.

Cation resin: A 0.5% formaldehyde solution can be introduced into the cation exchanger and piping system, and this concentration should be maintained during shutdown. Alternatively, it can be soaked in salt water, and rinsed with a 0.2% hydrogen peroxide or 0.5% formaldehyde solution before restarting the equipment.