LEWATIT® CNP P

Summary

Product identification

Lewatit® CNP P is a food-grade, weakly acidic, macroporous cation exchange resin based on crosslinked polyacrylate. It is bead-shaped with a special bead size distribution.

General Description

• Ionic form as shipped: H⁺
• Functional group: carboxylic acid
• Matrix: crosslinked polyacrylate
• Structure: macroporous
• Appearance: white, opaque

Physical and Chemical Properties

• Uniformity Coefficient: max. 1.8
• Bead size: > 90 % between 0.4 - 1.6 mm
• Effective size: 0.48 ± 0.05 mm
• Bulk density: 770 ± 5 % g/l
• Density: approx. 1.18 g/ml
• Water retention: 48 - 54 wt. %
• Total capacity: min. 4.6 eq/l
• Volume change (H⁺ → Ca²⁺): max. 7 vol. %
• Stability (pH-range): 0 - 14
• Storability (product): max. 1 year
• Storability (temperature range): -20 - 40 °C

Operating limits

• Operating temperature: max. 70 °C
• Operating pH-range: 5 - 14
• Bed depth: min. 800 mm
• Specific pressure drop (15 °C): approx. 1.3 kPa*h/m²
• Pressure drop: max. 250 kPa
• Linear velocity (operation): max. - m/h
• Linear velocity (backwash, 20 °C): approx. 12 - 14 m/h
• Bed expansion (20 °C, per m/h): approx. 5 vol. %
• Freeboard (backwash, external/internal): 60 - 80 vol. %

Regeneration (Counter current and Co current)

• Regenerant: HCl or H₂SO₄
• Regeneration level:
  • HCl: approx. 70 g/l
  • H₂SO₄: approx. 90 g/l
• Regeneration concentration:
  • HCl: 3 - 6 wt. %
  • H₂SO₄: 0.5 - 0.8 wt. %
• Linear velocity (regeneration): approx. 5 - 20 m/h
• Linear velocity (rinsing): approx. 5 - 20 m/h
• Rinse water requirement (slow/fast): approx. 3.5 BV

Applications

In the hydrogen form Lewatit® CNP P is suitable for:

• Decarbonisation and softening of drinking water (e.g., brewery water treatment).
• Use in household filter systems.
• Technical drinking water plants.

It is described as a particularly economical product for the decarbonisation of drinking water and liquids used as foodstuffs or in the production of foodstuffs due to its low regenerant requirement.

Safety and Storage

• Safety precautions: Strong oxidants, e.g., nitric acid, can cause violent reactions. Observe the safety data sheet for further information on product description, transport, storage, handling, safety, and ecology.
• Disposal: Dispose of ion exchange resins according to the European waste nomenclature.
• Storage: Recommended to store above the freezing point of water, under roof, in dry conditions, and away from direct sunlight. Frozen resin should thaw gradually at ambient temperature before handling or use.

Disclaimer: 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