LEWATIT® S 4228

Summary

Product identification

Lewatit® S 4228 is a food grade, macroporous, heterodisperse, medium basic anion exchange resin based on a styrene-divinylbenzene copolymer. It is bead-shaped and has a special bead size distribution.

Applications

Suitable for:

• Lewatit® WS system (fluidised bed)
• Lewatit® VWS system (compound fluidised bed)
• Standard co-current regenerated system

In its free base form, Lewatit® S 4228 is suitable for the removal of acid and simultaneous decolorisation of solutions of organic substances, such as sugar, gelatine, glycerine, grape must, whey, and fruit concentrates. The macroporous structure and the relation between the weakly and strongly basic groups ensure very good adsorption of organic substances (e.g., colorants) and partial absorption of organic acids and mineral acids. Substances are easy to desorb by regeneration with a solution of caustic soda.

Special care should be given to the initial cycles when treating potable water and listed aqueous solutions. Recommended start-up conditions are available on request.

Properties

Specified Data

• Common Description: Lewatit® S 4228
• Delivery form: Free base/Cl⁻
• Functional group: Tertiary amine/quaternary ammonium
• Matrix: Styrenic
• Structure: Macroporous
• Appearance: Beige, opaque
• Uniformity coefficient: max. 1.6
• Range of size for >90 vol% of all beads: 0.4-1.25 mm
• Effective size (d₁₀): 0.50-0.60 mm
• Total capacity (delivery form): min. 1.6 eq/L

Typical Physical and Chemical Properties

• Bulk density for shipment (+/- 5%): approx. 610 g/L
• Density: approx. 1.0 g/mL
• Water retention (delivery form): approx. 53-59 wt.%
• Volume change (free base / Cl⁻ - Cl⁻): max. approx. 30 %
• Volume change (during exhaustion): typical approx. 19 %
• Stability pH range: 0-14
• Stability temperature range: 1-70 °C
• Storage time (after delivery): max. 2 years
• Storage temperature range: -20 - +40 °C

Operation

• Operating temperature: max. 70 °C
• Operating pH range during exhaustion: 0-8
• Bed depth for single column: min. 800 mm
• Backwash bed expansion per m/h (20°C): 17 %
• Specific pressure loss (15°C): 1.1 kPa*h/m²
• Max. pressure loss during operation: 250 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

Additional Information & Regulations

Safety Precautions

Strong oxidants, e.g., nitric acid, can cause violent reactions if they come into contact with ion exchange resins. The safety data sheet must be observed for additional data on product description, transport, storage, handling, safety, and ecology.

Disposal

In the European Community, ion exchange resins must be disposed of according to the European waste nomenclature.

Storage

It is recommended to store ion exchange resins at temperatures above the freezing point of water, under roof, in dry conditions, and without exposure to direct sunlight. If resin becomes frozen, it should not be mechanically handled and left to thaw gradually at ambient temperature before handling or use. Do not accelerate the thawing process. Packaging stability is limited to 24 months under recommended storage conditions. It is recommended to use the product within this timeframe, otherwise, the packaging condition should be checked regularly.

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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