LEWATIT® S 4268

Summary

Product identification

Lewatit® S 4268 is a food grade, macroporous, monodisperse, medium basic anion exchange resin. It is based on a styrene-divinylbenzene copolymer with tertiary and quaternary amino groups.

In its free base form, Lewatit® S 4268 is suitable for:

• Removal of acid from solutions of organic substances
• Simultaneous decolorisation of solutions of organic substances (e.g., sugar, gelatine, glycerine, grape must, whey, fruit concentrates)

Its macroporous structure and the balance of weakly and strongly basic groups ensure good adsorption of organic substances (e.g., colorants) and partial adsorption of organic and mineral acids. Desorption of these substances is achieved by regeneration with a caustic soda solution.

Operating limits

• Stability pH range: 0-14
• Stability temperature range: 1-70 °C
• Operating temperature: max. 70 °C
• Operating pH range during exhaustion: 0-8

Feed water

• Suitable for treating potable water and aqueous solutions of organic substances.
• Special care should be given to the initial cycles of new resin when treating potable water. Refer to recommended start-up conditions.

Product water

Not specified in the extract.

Electrical

Not specified in the extract.

Mechanical / hydraulic

• Common Description:
  • Delivery form: Free base/Cl⁻
  • Functional group: Tertiary amine/quaternary ammonium
  • Matrix: Styrenic
  • Structure: Macroporous
  • Appearance: Beige, opaque
• Specified Data:
  • Uniformity coefficient: max. 1.1
  • Mean bead size (d₅₀): 0.54-0.64 mm
  • Total capacity (delivery form): min. 1.3 eq/L
• Typical Physical and Chemical Properties:
  • Bulk density for shipment (+/- 5%): 600 g/L
  • Density: approx. 1.0 g/mL
  • Water retention (delivery form): approx. 60-65 % by weight
  • Volume change (free base - Cl⁻): max. approx. 25 %
  • Volume change (during exhaustion): typical approx. 10 %
• Operation:
  • Bed depth for single column: min. 800 mm
  • Backwash bed expansion per m/h (20°C): 21 %
  • Specific pressure loss (15°C): 1 kPa*h/m²
  • Max. pressure loss during operation: 300 kPa
  • Specific flow rate: max. 5 BV/h
  • Freeboard during backwash: min. 80-100 vol. %
• 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 temperature range: -20 to +40 °C
• Storage time (after delivery): max. 2 years
• Recommended storage: above freezing point of water, under roof, dry conditions, without direct sunlight.
• If resin becomes frozen: Allow to thaw gradually at ambient temperature. Do not handle mechanically while frozen.
• Packaging stability is limited to 24 months under described storage conditions.
• Safety precautions: Avoid contact with strong oxidants (e.g., nitric acid) as this can cause violent reactions.
• Observe the safety data sheet for additional information.

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