LEWATIT® MonoPlus M 68

Summary

Product identification

• Product Name: LEWATIT® MonoPlus MP 68
• Description: Weakly basic, macroporous anion exchange resin with uniform size beads (monodisperse) based on a styrene-divinylbenzene copolymer.
• Delivery Form: Free base/Cl⁻
• Functional Group: Tertiary amine/quaternary ammonium
• Matrix: Styrenic
• Structure: Macroporous
• Appearance: Beige, opaque

Specified Data

• Uniformity Coefficient: max. 1.1
• Mean Bead Size (d50): 0.55 (±0.05) mm
• Total Capacity (delivery form): min. 1.3 eq/L

Typical Physical and Chemical Properties

• Bulk Density (for shipment): 620 (±5%) g/L
• Density: approx. 1.04 g/mL
• Water Retention (delivery form): approx. 54-60 wt.%
• Volume Change (free base / Cl⁻ - Cl⁻): max. approx. 24 %
• Stability pH Range: 0-14
• 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 at 20°C): 21 %
• Specific Pressure Loss (at 15°C): 1 kPa*h/m²
• Max. Pressure Loss (during operation): 300 kPa
• Specific Flow Rate: max. 40 BV/h

Regeneration

• NaOH Regeneration Concentration: approx. 2-6 wt.%
• NaOH Regeneration Quantity (co-current): min. 80 g/L resin
• NaOH Regeneration Quantity (counter-current): min. 50 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

Applications

• Demineralization of water for industrial steam generation (in combination with strong basic ion exchangers like Lewatit® MonoPlus M 500, especially recommended for Lewatit WS System).
• Treatment of electroplating rinse waters.
• Demineralization of water with high concentrations of humic acids and other organic substances to protect strong basic anion exchangers from fouling.

Special Features

• High exchange flow rates during regeneration and loading.
• Excellent utilization of total capacity.
• Low rinse water demand.
• Homogenous throughput of regenerants, water, and solutions, resulting in a homogenous working zone.
• Nearly linear pressure drop gradient across the entire bed depth, allowing for operation with higher bed depths.

Additional Information & Regulations

• Safety Precautions: Strong oxidants, such as nitric acid, can cause violent reactions with ion exchange resins. Observe the Safety Data Sheet.
• Disposal: Dispose according to European Waste Nomenclature.
• Storage: Recommended to store above freezing point, indoors, dry, and out of direct sunlight. If frozen, allow to thaw gradually at ambient temperature before handling or use. Do not accelerate thawing. Packaging stability is limited to 24 months; check packaging condition regularly if stored longer.

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