How to pretreat ion exchange resin

How to pretreat ion exchange resin

(1) Pretreatment steps of cation exchange resin

First of all, rinse the resin with clear water (it is better to backwash it) until the effluent is clear without Dao turbidity and impurities. After that, 4 ~ 5% HCl and NaOH were used to soak in the exchange column for 2 ~ 4 hours in turn. A large amount of clean water (preferably with mixed bed high-purity deionized water for washing) was used between the acid and alkali until the effluent was nearly neutral. The process was repeated for 2 ~ 3 times, and the acid-base dosage was twice of the resin volume each time. The last treatment was carried out with 4 ~ 5% HCl solution, and the effect of doubling the dosage was better. Put out the acid solution and wash it with water until it is neutral.
(2) Pretreatment steps of anion exchange resin
First, rinse the resin with clean water (preferably backwashing), until the effluent is clear and free of turbidity and impurities. After that, 4 ~ 5% NaOH and HCl are used to soak in the exchange column for 2 ~ 4 hours in turn. A large amount of clean water is used to wash between alkali and acid (it is better to use high-purity deionized water in mixed bed) until the effluent is nearly neutral. Repeat for 2 ~ 3 times, and the acid and alkali dosage is twice of the resin volume each time. The final treatment was carried out with 4 ~ 5% NaOH solution, and the effect of doubling the dosage was better. Drain the lye and rinse it with water until it is neutral.