LEWATIT® ASB 2

Summary

Product Identification

Lewatit® ASB 2 is a premium grade, gel, strong base, Type 2, anion exchange resin based on a styrene / DVB polymer. It has a slightly lower base strength than Lewatit® ASB 1, resulting in slightly higher silica leakage in standard co-current applications.

It is typically applied for waters where silica and carbonate content does not exceed 25% of the total anion content. Lewatit® ASB 2 is especially suited for separate bed applications where ease of regeneration, higher operating capacity, and lower NaOH consumption are important considerations for operating costs.

The resin exhibits high ion exchange capacity combined with excellent mechanical and osmotic strength for a long operating life. It is supplied in a heterodispersed particle size distribution as spherical beads in the fully swollen moist chloride form. It is prepared with a minimum amount of fines, resulting in low pressure losses during service.

Specified Data

• Common Description: Anion exchange resin
• Delivery form: Cl⁻
• Functional group: Quaternary ammonium, Type 2
• Matrix: Styrenic
• Structure: Gel
• Appearance: Yellow, translucent
• Uniformity coefficient: max. 1.6
• Range of size for >90 vol% of all beads: 0.3 - 1.25 mm
• Effective size (d₁₀): 0.50 (± 0.06) mm
• Total capacity (delivery form): min. 1.4 eq/L

Typical Physical and Chemical Properties

• Bulk density for shipment (± 5%): 700 g/L
• Density: approx. 1.11 g/mL
• Water retention (delivery form): approx. 38-45 % by weight
• Volume change (Cl⁻ - OH⁻): max. approx. 20 %
• Stability pH range: 0-14
• Storage time (after delivery): max. 2 years
• Storage temperature range: -20 to +40 °C

Operation

• Operating temperature: max. 30 °C
• Operating pH range during exhaustion: 0-12
• Bed depth for single column: min. 800 mm
• Bed depth per component in mixed bed: min. 500 mm
• Backwash bed expansion (per m/h at 20°C): 11 %
• Specific pressure loss (at 15°C): 1 kPa*h/m²
• Max. pressure loss during operation: 200 kPa
• Specific flow rate: max. 60 BV/h

Regeneration

• NaOH regeneration concentration: approx. 2-6 wt.%
• NaOH regeneration quantity (co-current): min. 100 g/L resin
• NaOH regeneration quantity (counter-current): min. 50 g/L resin
• Regeneration contact time: min. 20 minutes
• Slow rinse at regeneration flow rate: min. 2 BV
• Fast rinse at service flow rate: min. 2 BV

Additional Information & Regulations

• Safety precautions: Strong oxidants, such as nitric acid, can cause violent reactions if they come into contact with ion exchange resins.
• Toxicity: 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: Recommended to store above the freezing point of water, under roof, in dry conditions, and without direct sunlight. If frozen, allow to thaw gradually at ambient temperature before handling or use. Do not accelerate thawing.
• Packaging: Packaging stability is limited to 24 months under recommended storage conditions. Use within this timeframe or check packaging condition 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