LEWATIT® S 2528

Summary

Product identification

Lewatit® S 2528 is a food-grade, strongly acidic, highly crosslinked macroporous cation exchange resin based on crosslinked polystyrene. It is bead-shaped and has a special bead size distribution.

General Description:

• Ionic form as shipped: Na⁺
• Functional group: sulfonic acid
• Matrix: crosslinked polystyrene
• Structure: macroporous
• Appearance: beige-grey, opaque

Physical and Chemical Properties

• Total capacity*: min. 1.75 eq/l
• Uniformity Coefficient*: max. 1.6
• Bead size*: > 90 % between 0.4 - 1.2 mm
• Effective size*: 0.5 ± 0.05 mm
• Bulk density (± 5 %): approx. 760 g/l
• Density: approx. 1.27 g/ml
• Water retention: 45 - 50 wt. %
• Volume change (Na⁺ --> H⁺): max. 7 vol. %
• Stability at pH-range: 0 - 14
• Storability of the product: max. 2 years
• Storability temperature range: -20 - 40 °C

* Specification values subjected to continuous monitoring.

Recommended Operating Conditions

• Operating temperature: max. 120 °C
• Operating pH-range: 0 - 14
• Bed depth: min. 800 mm
• Specific pressure drop (15 °C): approx. 1.1 kPa*h/m²
• Pressure drop: max. 250 kPa
• Linear velocity (operation): Not specified
• Linear velocity (backwash, 20 °C): approx. 14 - 18 m/h
• Bed expansion (20 °C, per m/h): approx. 3.5 vol. %
• Freeboard (backwash, extern / intern): 80 - 100 vol. %

Regenerant and Rinse: See the official PDF for exact tabulated values for regenerant levels, concentrations, linear velocities, and rinse water requirements for HCl, H₂SO₄, and NaCl.

Applications

In the hydrogen form Lewatit® S 2528 is suitable for:

• Decationisation of solutions of organic products (e.g., sugar beet, sugar cane, starch sugar, glycerin, gelatine, whey).
• Extraction of amino acids (e.g., from molasses in the sodium form).
• Softening of thin juice (e.g., Gryllus process in the sodium form).
• Removal of alkali ions from B-green (e.g., Quentin process).

The macroporous structure facilitates the adsorption of hydrophilic high-molecular cationic organic substances, which can be desorbed by regeneration with caustic soda solution.

When treating 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.

Additional Information & Regulations

• Safety precautions: Strong oxidants (e.g., nitric acid) can cause violent reactions. Observe the safety data sheet.
• Disposal: Dispose of ion exchange resins according to European waste nomenclature.
• Storage: Store above freezing point, under roof, in dry conditions, out of direct sunlight. If frozen, thaw gradually at ambient temperature before handling or use.

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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