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Highly stable macroporous strong acid cation exchange resin based on sulfonated polystyrene-divinylbenzene matrix.
Exceptional resistance to osmotic shock and mechanical degradation, ensuring long service life in demanding cyclic operations.
Optimized particle size distribution (0.45–1.25 mm) for low pressure drop and uniform flow dynamics in fixed-bed systems.
Low soluble organic carbon (SOC) release, meeting stringent requirements for ultrapure water production.
Regenerable with standard sodium chloride or sulfuric acid solutions, supporting cost-effective and sustainable operation.
Polishing step in power plant high-purity boiler feedwater treatment.
Final cation removal in semiconductor-grade ultrapure water (UPW) systems.
Softening and decationization in pharmaceutical process water systems compliant with USP/EP standards.
Pre-treatment for reverse osmosis (RO) and electrodeionization (EDI) units in critical industrial applications.
Removal of heavy metal cations (e.g., Cu²⁺, Ni²⁺, Zn²⁺) from metal finishing rinse waters.
| Chemical Type | Strong acid cation exchanger (sulfonic acid group) |
| Product Form | Moist, spherical beads |
| Appearance | Beige to light brown, uniform spherical particles |
| Matrix Structure | Macroporous polystyrene-divinylbenzene copolymer |
| Functional Group | –SO₃H (sulfonic acid) |
| Ion Form | H⁺ (hydrogen form), supplied as Na⁺ (sodium form) unless specified |
| Particle Size Range | 0.45 – 1.25 mm (95% retained on 0.45 mm sieve) |
| Moisture Content | 47 – 53% (as shipped) |
Q1: What is the primary functional group and ionic form of LEWATIT S 4468?
A: LEWATIT S 4468 is a strongly acidic cation exchange resin based on a styrene-divinylbenzene matrix, functionalized with sulfonic acid groups. It is supplied in the sodium (Na⁺) form, making it suitable for softening and selective cation removal applications.
Q2: Is LEWATIT S 4468 suitable for use in food-grade or pharmaceutical water treatment systems?
A: Yes — LEWATIT S 4468 is manufactured and tested to meet requirements for use in the production of potable water and process water in food and pharmaceutical industries. It complies with relevant global regulatory expectations for ion exchange resins intended for indirect contact with consumables, subject to proper regeneration and validation protocols.
Q3: How does LEWATIT S 4468 compare to standard gel-type strong acid cation resins in terms of kinetics and capacity?
A: LEWATIT S 4468 features a macroporous structure, which provides enhanced kinetic performance—especially in solutions with high organic content or suspended solids—and improved resistance to fouling compared to conventional gel-type resins. Its total exchange capacity is slightly lower than gel types but remains highly effective across variable feedwater conditions.
Q4: What regeneration chemicals and typical conditions are recommended for LEWATIT S 4468?
A: Sodium chloride (NaCl) is the standard regenerant for softening applications. For full cation removal or specialized cycles, hydrochloric acid (HCl) may be used. Regeneration efficiency depends on concentration, flow rate, and contact time; optimal parameters should be determined through system-specific testing and pilot trials.
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