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Highly selective for potassium (K⁺) and ammonium (NH₄⁺) ions in complex aqueous matrices.
Stable macroporous polystyrene-divinylbenzene matrix ensures excellent mechanical strength and pressure resistance.
Optimized particle size distribution (0.3–1.2 mm) for uniform flow dynamics and low pressure drop in fixed-bed systems.
Chemically resistant to oxidants, moderate acids, and alkalis—suitable for demanding regeneration cycles.
Low osmotic swelling behavior maintains consistent bed volume during ion exchange and regeneration.
Ammonium removal from industrial wastewater and landfill leachate prior to biological treatment.
Potassium recovery and concentration in fertilizer production and process streams.
Softening and selective cation removal in pharmaceutical-grade water purification systems.
Pre-treatment for reverse osmosis (RO) feedwater to prevent scaling by monovalent cations.
Radioactive cesium (Cs⁺) and strontium (Sr²⁺) capture in nuclear decontamination applications.
| Chemical Type | Macroporous strong-acid cation exchange resin (sulfonic acid functional group) |
| Product Form | Moist, spherical beads |
| Appearance | Light amber to brown, uniform spherical particles |
| Functional Group | –SO₃H (sulfonic acid) |
| Matrix | Crosslinked polystyrene-divinylbenzene (DVB ≥ 8%) |
| Ion Form | H⁺ form (ready for conversion to Na⁺, K⁺, or NH₄⁺ as required) |
| Particle Size Range | 0.3–1.2 mm |
| Moisture Content | 45–50% (w/w) |
Q1: What is the primary functional group and ionic form of LEWATIT K 2440?
A: LEWATIT K 2440 is a strongly basic anion exchange resin with quaternary ammonium functional groups, supplied in the chloride (Cl⁻) ionic form.
Q2: Is this resin suitable for deionization of ultrapure water in pharmaceutical or electronics applications?
A: Yes — LEWATIT K 2440 is widely used in mixed-bed and polishing configurations for high-purity water production, offering low extractables and consistent performance under controlled regeneration protocols.
Q3: How does LEWATIT K 2440 compare to gel-type anion resins in terms of kinetic performance and chemical stability?
A: As a macroporous resin, K 2440 exhibits enhanced kinetics for large or weakly ionized molecules and superior resistance to oxidation and osmotic shock compared to conventional gel-type anion exchangers.
Q4: Can LEWATIT K 2440 be regenerated effectively after exhaustion with sulfate or nitrate ions?
A: Yes — it regenerates efficiently with sodium chloride brine, though higher valence anions like sulfate may require slightly extended contact time or increased regenerant dosage to ensure full capacity recovery.
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