LEWATIT® S 5228

Summary

Product Identification

Lewatit® S 5228 is a food grade, gelular, weakly basic anion exchange resin based on a crosslinked polyacrylate with a special bead size distribution. It features a tertiary amine functional group and an acrylic matrix.

Key Features and Applications

• Effective adsorption and desorption of naturally occurring organic substances due to its acrylic structure.
• High total capacity, outstanding mechanical stability, and excellent resistance to osmotic shocks.
• Particularly suitable for:
  • Demineralization of aqueous solutions (e.g., gelatine, fruit juices, whey, food acids) in co-current or modern counter-current systems.
  • Removal of organic matter.

Note: Special care is recommended for initial cycles when treating potable water or listed aqueous solutions to allow the resin to reach its full potential. Refer to recommended start-up conditions for details.

Physical and Chemical Properties

• Common Description:
  • Delivery form: Free base
  • Functional group: Tertiary amine
  • Matrix: Acrylic
  • Structure: Gel
  • Appearance: Ivory, translucent
• Specified Data:
  • Uniformity coefficient: max. 1.8
  • Range of size for >90 vol% of all beads: 0.4-1.6 mm
  • Effective size (d₁₀): 0.50-0.75 mm
  • Total capacity (delivery form): min. 1.6 eq/L
• Typical Physical and Chemical Properties:
  • Bulk density for shipment (+/- 5%): approx. 740 g/L
  • Density: approx. 1.1 g/mL
  • Water retention (delivery form): approx. 53-61 wt%
  • Volume change (free base - Cl⁻): max. approx. 25%
  • Stability pH range: 0 - 14
  • Stability temperature range: 1-40 °C
  • Storage time (after delivery): max. 2 years
  • Storage temperature range: -20 - +40 °C

Operation and Regeneration

• Operating Limits:
  • Operating temperature: max. 60 °C
  • Operating pH range during exhaustion: 0-8
  • Bed depth for single column: min. 800 mm
  • Backwash bed expansion per m/h (20°C): 15%
  • Specific pressure loss (15°C): 1.1 kPa·h/m²
  • Max. pressure loss during operation: 150 kPa
  • Specific flow rate: max. 5 BV/h
  • Freeboard during backwash: min. 80-100 vol%
• Regeneration:
  • NaOH regeneration concentration: approx. 2-6 wt%
  • NaOH regeneration quantity (co-current): min. 80 g/L resin
  • NaOH regeneration quantity (counter-current): min. 50 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

Additional Information and Regulations

• Safety: Avoid contact with strong oxidants (e.g., nitric acid) which can cause violent reactions. Observe the safety data sheet for transport, storage, handling, safety, and ecology information.
• Disposal: Dispose of ion exchange resins according to the European waste nomenclature within the European Community.
• Storage: Store under roof in dry conditions, protected from direct sunlight, and above the freezing point of water. If frozen, allow to thaw gradually at ambient temperature before handling or use.
• Packaging: Packaging stability is limited to 24 months under recommended storage conditions. Use within this timeframe or ensure packaging is regularly checked.

---

Disclaimer: This extracted summary may not include all figures, footnotes, or revisions present in the original OEM PDF datasheet. Contractual data must be verified against the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror