LEWATIT® S 4528

Summary

Product identification

Lewatit® S 4528 is a food grade, macroporous, heterodisperse, weakly basic anion exchange resin based on a styrene-divinylbenzene copolymer. It is bead-shaped and has a special bead size distribution.

Applications

• Lewatit® WS system (fluidized bed)
• Lewatit® VWS system (compound fluidized bed)
• Standard co-current regenerated system
• Removal of acid and simultaneous decolorization of solutions of organic products (sugar, gelatine, glycerin, grape must, whey, fruit concentrates, etc.)
• Treatment of products sensitive to alkali.
• Potable water treatment.

Functional Properties

• Delivery form: Free base
• Functional group: Tertiary amine
• Matrix: Styrenic
• Structure: Macroporous
• Appearance: Beige, opaque

Operating limits

• Stability pH range: 0-14
• Stability temperature range: 1-80 °C
• Operating temperature: max. 80 °C
• Operating pH range during exhaustion: 0-8
• Max. pressure loss during operation: 250 kPa

Feed water

• Bed depth for single column: min. 800 mm
• Freeboard during backwash: min. 80-100 vol. %

Product water

• Total capacity (delivery form): min. 1.7 eq/L

Electrical

No data available in the extract.

Mechanical / hydraulic

• Bulk density for shipment (+/- 5%): 620 g/L
• Density: approx. 1.0 g/mL
• Water retention (delivery form): approx. 42-53 % by weight
• Volume change (free base - Cl⁻): max. approx. 48 %
• Volume change (during exhaustion): typical approx. 36 %
• Backwash bed expansion (per m/h at 20°C): 30 %
• Specific pressure loss (15°C): 1.1 kPa*h/m²
• Specific flow rate: max. 5 BV/h

Regeneration

• NaOH regeneration concentration: approx. 2-4 wt. %
• NaOH regeneration quantity (co-current): min. 80 g/L resin
• NaOH regeneration quantity (counter-current): min. 60 g/L resin
• Regeneration contact time: min. 30 minutes
• Slow rinse (at regeneration flow rate): min. 2 BV
• Fast rinse (at service flow rate): min. 4 BV

Storage and Handling

• Storage time (after delivery): max. 2 years
• Storage temperature range: -20 to +40 °C
• Recommended storage conditions: Store above freezing point of water, under roof, in dry conditions without direct sunlight.
• Frozen resin: Allow to thaw gradually at ambient temperature; do not mechanically handle until completely thawed.

Specifications

• Uniformity coefficient: max. 1.6
• Range of size for >90 vol% of all beads: 0.4-1.25 mm
• Effective size (d10): 0.47-0.57 mm

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror