The amount of acid and base used in the regeneration of mixed bed resin

With the passage of time, the treatment efficiency of mixed bed resin will gradually decrease, and it is necessary to restore its performance by regeneration. It should be noted that in the process of regeneration, the amount of acid and base needs to be strictly controlled to prevent the resin from being damaged because of too strong acid and alkali, and ensure the good regeneration effect.
How to determine its regenerated acid base
The amount of acid and base used in the regeneration process will vary depending on the specific mixed-bed resin type and regeneration conditions. The following is the amount of acid and base used in the regeneration of mixed-bed resin in general:
1. Acid regeneration: Anion exchange resin in mixed bed resin usually removes adsorbed cations through acid regeneration, the more common acids include hydrochloric acid (HCl) or sulfuric acid (H2SO4), the concentration and dosage of acid will vary according to the type of resin, the type and concentration of adsorption and the requirements of regeneration effect.
2. Alkali regeneration: The cation exchange resin in the mixed bed resin usually removes the adsorbed anions by alkali regeneration, among which the more common bases include sodium hydroxide. (NaOH) or potassium hydroxide (KOH), depending on the type of resin, the type of adsorption, the concentration and the requirements of the regeneration effect, the concentration and the amount of alkali will also vary.
Note: The specific pH content should be determined according to the actual situation, and it is best to refer to the advice of the resin supplier or the relevant technical manual. In addition, in order to ensure the regeneration effect and the safe use of resin, attention should be paid to controlling the pH value and temperature of the acid-base solution during the regeneration process.
The effect of too much or too little acid base
The use of too much or too little acid and base in the regeneration of mixed bed resin will have adverse effects on the regeneration effect and resin properties:
1. Excessive pH:
- Expansion problems: Using too much acid and base may cause the resin bed to expand too much, beyond the design range. This can lead to instability and structural damage of the resin bed.
Waste of resources: Excessive amounts of acid and base will increase the use of chemicals, resulting in wasted resources and increased operating costs.
- Damage to the resin: Excessive acid and base may cause corrosion or damage to the surface of the resin, reducing the life and performance of the resin.
2. Too little pH:
- Incomplete regeneration: The use of too little acid and base may not be able to completely remove the ions adsorbed on the resin, resulting in poor regeneration and reduced adsorption capacity of the resin.
- Impact on resin properties: the adsorption is not completely removed, which may lead to a decrease in resin exchange capacity, affecting the working efficiency of the resin and the water quality treatment ability.
Therefore, in the process of mixed-bed resin regeneration, the appropriate amount of acid and base should be ensured according to the requirements of the resin type, the type and concentration of adsorption, and the regeneration effect. Proper pH content can better restore the function of mixed bed resin and ensure that its regeneration effect is restored to the best state, so controlling the use of pH content is one of the important steps of mixed bed resin regeneration.