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Three Points To Note About The Application Of Ion Exchange Resin

Jun 04, 2020

1) Storage and transportation

a) The storage temperature of ion exchange resin should be between 5-40℃. Ion exchange resin should be stored in a sealed container to avoid cold or exposure. If there is no anti-freezing facility in winter, the resin can be stored in saline water, and the concentration of the saline water can be determined according to the temperature. Once the resin is frozen, do not suddenly turn to a high temperature environment, but put it in a low temperature environment of 5-10℃ to let it thaw slowly.

b) The ion exchange resin contains a certain amount of water, which should be kept during storage, transportation and application. If the resin loses water, it should be soaked in concentrated saline (about 10%) and then gradually diluted. Do not add water directly to avoid the resin from swelling and breaking.

c) During long-term storage of resin, strong resin should be converted into salt type, and weak resin should be converted into hydrogen type or free alkali type, and then soaked in clean water.

d) The storage period of resin is 2 years, and it can be used only after passing the re-inspection after 2 years.

e) During use, storage and transportation, the resin shall be strictly prevented from being contaminated by organic oils.

2) Pretreatment

Industrially produced ion exchange resins often contain some excess solvents, oligomers and other impurities, which must be removed, otherwise it will affect the exchange effect and the quality of the effluent, so the new resin must be pretreated. After the resin is pretreated, it can be converted into the desired ionic form, which can also improve its stability and can play the role of activating the resin.

a) Pretreatment of cation resin: after washing the resin with water until it flows out of water, soak it with 2-4% NaOH for 4-8 hours and then wash with water to neutral, then soak with 5% hydrochloric acid for 4-8 hours and wash with water to pH 6, stand-by.

b) Anion resin pretreatment: wash the resin with water until it flows out of clean water, soak with 5% hydrochloric acid for 4-8 hours, wash with water to pH6, then soak with 2-4%NaOH for 4-8 hours, wash with water to pH7- 9. Stand by.

c) D301-Ⅲ, D301 weak base resin pretreatment: soak the resin in warm water for 4-8 hours, wash to pH 6 with water, then soak in 2-4% NaOH for 4-8 hours, wash to neutral with water, it is possible to proceed Secondary treatment, to be used.

d) For resins used in the pharmaceutical industry and food industry, please handle them according to special requirements.

e) The user can design according to different application processes to convert the resin into the desired ion type.

3) Pollution, poisoning and activation of ion exchange resin:

Ion exchange resins are susceptible to contamination by suspended substances, colloidal substances, organic matter, bacteria, algae, iron, manganese, etc. during long-term use, which reduces or even loses the ion exchange capacity. Therefore, it is necessary to perform irregular activation treatment on the resin according to the situation. The activation method can be determined according to the pollution situation and conditions. Generally, the cation resin is susceptible to Fe3+ pollution during softening, and it can be gradually diluted after immersion in hydrochloric acid. Anion resin is easily contaminated by organic matter, soak or rinse with 10%NaCl+2-5%NaOH mixed solution. If necessary, it can be immersed in a 1% hydrogen peroxide solution for several minutes, and can also be treated with alternating acid and alkali treatment methods, bleaching treatment methods, alcohol treatment methods and various sterilization methods.