LEWATIT® S 1668

Summary

Product identification

Lewatit® S 1668 is a monodisperse, food grade, gel-type, strongly acidic cation exchange resin based on a styrene-divinylbenzene copolymer.

Applications:

• Softening of solutions, particularly for thin juices in the sugar and pectin industries.
• Decationisation of solutions of organic products (e.g., sugar beet, sugar cane, starch sugar, glycerine, gelatine, whey, food acids).
• Extraction of amino acids (e.g., lysine).

Special features of the resin bed:

• High exchange flow rates during regeneration and loading.
• Good utilization of total capacity.
• Low sweeten-on, sweeten-off, and rinse water demand.
• Homogeneous throughput of regenerants, water, and solutions, leading to a homogeneous working zone.
• Nearly linear pressure drop gradient across the entire bed depth, allowing for operation with higher bed depths.

Operating limits

• Stability pH range: 0-14
• Stability temperature range: 1-120 °C
• Operating temperature (max): 120 °C
• Operating pH range during exhaustion: 0-14
• Maximum pressure loss during operation: 200 kPa

Feed water

• Bed depth for single column (min): 800 mm
• Backwash bed expansion (at 20°C per m/h): 4 %
• Specific flow rate (max): 20 BV/h
• Freeboard during backwash (min): 80-100 vol. %

Product water

• Optimized kinetics: Increased operating capacity compared to resins with heterodisperse bead size distribution.
• High total capacity: Provides long running times with low leakage and economical regeneration amounts.

Electrical

No information available in the extract.

Mechanical / hydraulic

• Bulk density for shipment (+/- 5%): 830 g/L
• Density (approx.): 1.3 g/mL
• Water retention (delivery form, approx. weight %): 41-46 %
• Volume change (Na⁺ to H⁺, max. approx. %): 12 %
• Specific pressure loss (at 15°C): 1 kPa*h/m²

Specified Data

• Uniformity coefficient (max): 1.1
• Mean bead size (d₅₀): 0.57-0.67 mm
• Total capacity (delivery form, min.): 2.2 eq/L

Regeneration

HCl Regeneration

• Concentration (approx. wt. %): 4-6 %
• Quantity co-current (min.): 100 g/L resin
• Quantity counter-current (min.): 55-65 g/L resin

H₂SO₄ Regeneration

• Concentration (approx. wt. %): 1.5-3 %
• Quantity co-current (min.): 150 g/L resin
• Quantity counter-current (min.): 80 g/L resin

NaCl Regeneration

• Concentration (approx. wt. %): 8-10 %
• Quantity co-current (min.): 200 g/L resin
• Quantity counter-current (min.): 100 g/L resin

Rinse Volumes

• Regeneration contact time (min.): 20 minutes
• Slow rinse at regeneration flow rate (min.): 2 BV
• Fast rinse at service flow rate (min.): 4 BV

Additional Information & Regulations

• Safety precautions: Strong oxidants (e.g., nitric acid) can cause violent reactions. Observe the safety data sheet.
• Disposal: Must be disposed of according to European waste nomenclature.
• Storage: Recommended to store above freezing point, under roof, dry, and out of direct sunlight. If frozen, allow to thaw gradually at ambient temperature. Packaging stability is limited to 24 months.
• Start-up: For potable water and listed aqueous solutions, special care should be given to initial cycles. Recommended start-up conditions are available on request.

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