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Highly selective for divalent cations such as Ca²⁺ and Mg²⁺ in softening applications.
Optimized spherical bead morphology ensures low pressure drop and excellent hydraulic stability.
Superior chemical and osmotic stability across wide pH range (1–14) and repeated regeneration cycles.
Low soluble organic carbon (SOC) leaching, meeting stringent requirements for ultrapure water systems.
Consistent particle size distribution (0.3–1.2 mm) enabling uniform flow dynamics and predictable performance.
Industrial boiler feedwater softening to prevent scale formation and extend equipment life.
Pretreatment for reverse osmosis (RO) and electrodeionization (EDI) systems in power and semiconductor industries.
Removal of hardness ions from process water in pharmaceutical and biotechnology manufacturing.
Recovery and purification of metal-bearing effluents in electroplating and surface finishing operations.
Production of high-purity rinse water for electronics cleaning and photovoltaic wafer processing.
| Chemical Type | Strong acid cation exchange resin (sulfonated polystyrene-divinylbenzene matrix) |
| Product Form | Moist, sodium-form beads |
| Appearance | Opaque, light amber spherical beads |
| Primary Applications | Water softening, demineralization pretreatment, selective hardness removal |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ideal Operating Temperature | 5–50 °C |
| Maximum Operating Temperature | 100 °C (short-term) |
| Regenerant | Sodium chloride (NaCl) or hydrogen chloride (HCl) |
Q1: What is the primary functional group and ionic form of LEWATIT S 5221?
A: LEWATIT S 5221 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 5221 suitable for use in potable water treatment systems?
A: Yes — LEWATIT S 5221 is widely used in drinking water softening and conditioning applications. It complies with common regulatory frameworks for materials in contact with potable water when operated within recommended pH, temperature, and regeneration guidelines.
Q3: How does LEWATIT S 5221 compare to standard gel-type strong acid cation resins in terms of physical stability and fouling resistance?
A: LEWATIT S 5221 features a macroporous structure, offering enhanced mechanical strength and superior resistance to organic fouling and osmotic shock compared to conventional gel-type resins. This makes it especially robust in challenging feed waters containing oxidants or suspended solids.
Q4: What regeneration chemicals are typically used, and how does regeneration efficiency compare to gel resins?
A: Sodium chloride (NaCl) is the standard regenerant. Due to its macroporous morphology, LEWATIT S 5221 generally achieves efficient regeneration with moderate salt dosage and shorter rinse times, though full capacity restoration may require slightly higher regenerant concentration than some gel resins under low-flow conditions.
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E-mail: wangxingqiang@ericwchem.com
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