Water Deionization Provide Qualified Water for Industrial Production

Dissolved ions (such as calcium, magnesium, sodium, chloride, etc.) will have a serious impact on many industrial processes, water deionization is the best way to solve these problems. water deionization is a process to remove all dissolved ions and other impurities from the water using ion exchange resins. It is crucial in many sectors, from pharmaceuticals, labs to electronics where there has critical requirements on water purity.

We supply the best ion exchange resin types for water deionization applications. According to the selected deionization process, you can choose the suitable SAC and SBA resin types for your water treatment applications.

• Cation exchange resin. Removes cation ion impurities in the water, such as, Ca²⁺, Fe³⁺, Mg²⁺, Mn²⁺, K⁺, Na⁺, etc.
• Anion exchange resins. Removes cation ion impurities in the water, such as, CO₃^2-, HCO₃^-, Cl^-, NO₃^-, SO₄^2-, SiO₂
• Mixed bed resins. Containing cation exchange resins and anion exchange resins for polishing and remove all ions in the water.

Ion exchange is the classical water deionzation method, it make full of the high ion exchange capacity to remove all dissolved ions in the water. The main process is as follows:

Pre-treatment

before entering the ion exchange tank, the raw water will be pre-treated to remove suspended matter, colloidal particles and organic matters. The common pre-treatment methods include sand filtration, activated carbon filtration and precision filtration. This pre-treatment can prevent impurities from clogging the ion exchange resins and extend their service life.

Cation exchange reaction

Pre-treated water flows through the cation resin tank, where there has cation resin tanks with hydrogen ions (H⁺). The dissolved cation ions (Ca²⁺, Mg²⁺, Na⁺) will be exchanged with H⁺, the ion exchange process is as follows:
R-H + Na⁺ → R-Na + H⁺
R-H + Ca²⁺ → R-Ca + 2H⁺
R-H + Mg²⁺ → R-Mg + 2H⁺

After that , the dissolved cation ions are removed and the content of H+ ions in the water increases.

Anion exchange

Water flows through the anion resin tank, where there has anion resin tanks with hydroxide ion (OH^-). The dissolved cation ions (Cl^-, SO₄^2-, CO₃^2-) will be exchanged with OH^-, the ion exchange process is as follows:
R-OH + Cl^- → R-Cl + OH⁻
2(R-OH) + CO₃^2- → (R₂CO₃) + 2OH^-
2(R-OH) + SO₄^2- → (R₂SO₄) + 2OH^-

After that , the dissolved anion ions are removed and the content of OH- ions in the water increases.

Water synthesis reactions

After cation exchange and anion exchange, hydrogen ions (H⁺) and hydroxide ions (OH-) in water combine with each other to form water molecules (H₂O).

Through this process, most of the ions in the water are removed, producing high purity deionized water.

Resin regeneration

After a period of use, the ions on the resin are gradually exhausted and regeneration process is required.

• Cation exchange resin regeneration: Hydrogen ions are restored to the resin by regeneration using an acid solution such as hydrochloric acid HCl or sulfuric acid H₂SO₄.
  
• Anion exchange resin regeneration: Regeneration using a base solution (e.g. sodium hydroxide NaOH) restores the hydroxide ions of the resin.
  

After regeneration, the resin is restored to its initial state and can continue to be used to remove ions from water.

Electronics & Semiconductor Manufacturing

• Wafer Cleaning and Rinsing: Used to clean delicate semiconductor components without leaving residue.
• Circuit Board Production: Provides contamination-free water for etching and rinsing processes.
• Ultrapure Water Systems: DI water is further treated to meet the extreme purity requirements of microchip fabrication.

Food and Beverage Industry

• Ingredient in Beverages: Ensures purity and consistency in bottled water, soft drinks, and other beverages.
• Cleaning and Sterilization: Used for cleaning equipment and surfaces in food processing plants.

Metal and Surface Treatment

• Plating and Coating: Ensures consistent adhesion and finish in electroplating and painting processes.
• Cleaning: Removes contaminants from metal surfaces prior to treatment.