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Highly selective for multivalent cations including Ca²⁺, Mg²⁺, and heavy metals such as Ni²⁺ and Cu²⁺.
Stable macroporous polystyrene-divinylbenzene matrix ensures excellent physical and chemical durability under varying pH and oxidative conditions.
Optimized particle size distribution (0.3–1.2 mm) enables low pressure drop and uniform flow dynamics in both fixed-bed and moving-bed systems.
Low soluble organic matter (SOM) release supports compliance with stringent water purity requirements in pharmaceutical and electronics applications.
Regenerable with standard acid solutions (e.g., HCl or H₂SO₄), offering long service life and reduced operational cost per cycle.
Ultrapure water (UPW) polishing in semiconductor manufacturing facilities.
Pre-treatment and final polishing of pharmaceutical process water (PW, WFI).
Removal of hardness and trace heavy metals from industrial boiler feedwater.
Recovery and purification of metal-bearing rinse waters in electroplating operations.
Cation removal in laboratory-grade water purification systems.
| Chemical Type | Strongly acidic cation exchanger (sulfonic acid group) |
| Product Form | Macroporous gel-type hybrid resin |
| Appearance | Moist, spherical beads; light to medium amber color |
| Functional Group | –SO₃H (sulfonic acid) |
| Ionic Form | H⁺ (hydrogen form) |
| Moisture Content | 45–50 % (w/w) |
| Particle Size Range | 0.3–1.2 mm |
| Uniformity Coefficient | ≤ 1.6 |
Q1: What is the primary functional group and ionic form of LEWATIT K 7333?
A: LEWATIT K 7333 is a strongly basic anion exchange resin in the chloride form, featuring quaternary ammonium functional groups grafted onto a styrene-divinylbenzene matrix.
Q2: In which types of industrial water treatment applications is this resin most commonly deployed?
A: It is widely used for demineralization, nitrate removal, sulfate reduction, and selective anion polishing in power plant feedwater, pharmaceutical water systems, and high-purity process water loops where low silica and total organic carbon (TOC) leaching are critical.
Q3: How does LEWATIT K 7333 differ from standard Type I or Type II strong base anion resins?
A: K 7333 is engineered with enhanced chemical stability and lower swelling characteristics, offering improved resistance to oxidation and superior performance in mixed-bed configurations—particularly when paired with cationic resins for ultrapure water generation.
Q4: What regeneration chemicals and typical operating conditions are recommended?
A: Sodium hydroxide (NaOH) is the standard regenerant, typically applied at concentrations between 2–4% w/w. Optimal regeneration efficiency is achieved under controlled flow rates and temperature conditions consistent with standard anion exchange protocols—avoiding excessive temperatures above 40 °C to preserve long-term matrix integrity.
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