LEWATIT® S 7468

Summary

Product identification

Lewatit® S 7468 is a food-grade, macroporous, monodisperse, strongly basic (type II) anion exchange resin based on a styrene-divinylbenzene copolymer. It is designed for demineralization and decolorization applications, and for effective adsorption and desorption of organic substances due to its special macroporous structure.

Lewatit® S 7468 is especially suitable for:

• Demineralization of water for food applications operated with co-current or modern counter-current systems (e.g., Lewatit® WS System, Lewatit® Liftbed System or Lewatit® Rinsebed System).
• Polishing systems or conventional mixed bed arrangements in combination with Lewatit® S 2568 H.
• Working mixed beds in combination with Lewatit® S 2568 H.

Key features of Lewatit® S 7468 include:

• High flow rates during regeneration and loading.
• Good utilization of total capacity.
• Low demand for rinse water.
• Homogeneous throughput of regenerants, water, and solutions, resulting in a homogeneous operating zone.
• Virtually linear pressure drop gradient across the entire bed depth, allowing for higher bed depths.
• Good separation of components in mixed bed applications.

When using Lewatit® S 7468 to treat potable water and specified aqueous solutions, special care should be given to the initial cycles of the new resin. Recommended start-up conditions are available on request.

Operating limits

• Stability pH range: 0-14
• Stability temperature range: 1-40 °C
• Operating temperature: max. 40 °C
• Operating pH range during exhaustion: 0-12

Mechanical / hydraulic

• Uniformity coefficient: max. 1.1
• Mean bead size (d₅₀): 0.55-0.65 mm
• Bulk density for shipment (+/- 5%): 650 g/L
• Density: approx. 1.1 g/mL
• Volume change (Cl⁻ - OH⁻): max. approx. 15 %
• Bed depth for single column: min. 800 mm
• Bed depth per component in mixed bed: min. 500 mm
• Backwash bed expansion per m/h (20°C): 10 %
• 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. %

Feed water

• Total capacity (delivery form): min. 1.0 eq/L

Product water

• Water retention (delivery form): approx. 58-63 % weight

Regeneration

• NaOH regeneration concentration: approx. 2-6 wt. %
• NaOH regeneration quantity co-current: min. 100 g/L resin
• NaOH regeneration quantity counter-current: min. 60 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

Electrical

No data available in the extract.

Other properties

• Common Description: Type 2
• Delivery form: Cl⁻
• Functional group: Quaternary ammonium
• Matrix: Styrenic
• Structure: Macroporous
• Appearance: Beige, opaque
• Storage time (after delivery): max. 2 years
• Storage temperature range: -20 - +40 °C

Safety and Storage

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. Ion exchange resins should be disposed of according to the European waste nomenclature.

It is recommended to store ion exchange resins above the freezing point of water, under roof, in dry conditions, and without direct sunlight. If the resin becomes frozen, allow it to thaw gradually at ambient temperature before handling or use. Packaging stability is limited to 24 months under recommended storage conditions.

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