D113 Weak Acid Cation Resins

D113 Weak Acid Cation Resin

Overview
D113 is a type of weak acid cation (WAC) exchange resin widely used in various industrial applications, particularly in water treatment, chemical processing, and metal recovery. This resin is designed to effectively remove cations, especially hardness ions like calcium (Ca²⁺) and magnesium (Mg²⁺), through ion exchange mechanisms.

Chemical and Physical Properties

  • Type: Weak acid cation exchange resin
  • Functional Group: Carboxylic acid (-COOH)
  • Polymer Matrix: Typically made from crosslinked polyacrylic or polystyrene copolymers
  • Ionic Form: Hydrogen (H⁺) or sodium (Na⁺) form
  • Particle Size: 0.3–1.2 mm (varies by manufacturer)
  • Moisture Content: Typically 50-60%
  • Operating pH Range: 4–14
  • Regeneration: Regenerated using acids like hydrochloric acid (HCl) or sulfuric acid (H₂SO₄)

Applications

  1. Water Softening

    • Primarily used in partial softening of water by removing bicarbonate hardness (temporary hardness).
    • Works effectively in conjunction with strong acid cation (SAC) resins for complete water softening.

  2. Demineralization

    • Used in the demineralization of process water in industries such as power plants, pharmaceuticals, and electronics manufacturing.
    • Removes divalent and trivalent metal ions from water.

  3. Metal Recovery

    • Applied in hydrometallurgical processes for recovering valuable metals like copper, nickel, and zinc.

  4. Organic Acid Recovery

    • Helps in the purification and recovery of organic acids, such as citric acid and lactic acid, from fermentation processes.

  5. Pharmaceutical and Food Processing

    • Used in deashing and purification of solutions in pharmaceutical and food industries.

Advantages
✔ High selectivity for divalent metal ions
✔ Efficient regeneration with low acid consumption
✔ Good mechanical and chemical stability
✔ High exchange capacity for temporary hardness removal
✔ Low operational cost compared to strong acid cation resins

Limitations
✖ Limited efficiency in removing non-bicarbonate hardness
✖ Requires pH control for optimal performance
✖ Not suitable for high TDS (total dissolved solids) applications without additional treatment

Conclusion
D113 weak acid cation resin is an efficient and cost-effective solution for partial water softening, metal removal, and demineralization processes. Its selective ion exchange capacity and regenerative properties make it a valuable component in industrial and municipal water treatment systems.




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