LEWATIT® TP 207

Summary

Product Identification

Lewatit® TP 207 is a weakly acidic, macroporous cation exchange resin with chelating iminodiacetate groups.

Applications

This resin is selective for the extraction of heavy metal cations from weakly acidic to weakly<bos> basic solutions. It is especially suitable for:

• Selective removal of trace heavy metals from effluents of the metal surface finishing industry, even in the presence of high calcium concentrations.
• Recovery of useful metals from electroplating rinse waters.
• Removal of metal contaminants from processing baths.
• Concentration, extraction and recovery of heavy metals from hydrometallurgical solutions.
• Removal of heavy metals from contaminated ground water for potable water production or ground water remediation.

The resin can achieve selective extraction even in the presence of complexing agents such as nitrogen compounds, multivalent carboxylic acids, and phosphates.

Limitations:

• Does not remove heavy metals from solutions containing EDTA or NTA.
• Only cadmium is removed from solutions containing cyanides.
• For extraction of heavy metals following the uranyl oxide ion in the selectivity sequence, conditioning with caustic soda solution is required after regeneration.

General Description

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

Physical and Chemical Properties

• Total capacity* (H-Form): min. 2.2 eq/l
• Uniformity Coefficient*: max. 1.7
• Bead size*: > 90 % between 0.4 - 1.25 mm
• Effective size*: 0.55 (± 0.05) mm
• Specific pressure drop (15 °C): approx. 1.1 kPa*h/m²
• Bed expansion (20 °C, per m/h): approx. 4 vol. %
• Bulk density (± 5 %): 720 g/l
• Density: approx. 1.17 g/ml
• Water retention: 53 - 58 wt. %
• Volume change (Na⁺ --> H⁺): max. -30 vol. %
• Stability (pH-range): 0 - 14
• Storability (max. years): 2
• Storability temperature range: -20 - 40 °C

Recommended Operating Conditions

• Operating temperature: max. 80 °C
• Operating pH-range: 1.5 - 9
• Bed depth: min. 1000 mm
• Pressure drop: max. 250 kPa
• Specific velocity (operation): max. 30 BV/h
• Bed expansion (backwash): min. 40 %
• Linear velocity (operation): max. 40 m/h
• Linear velocity (backwash, 20 °C): approx. 10 m/h
• Freeboard (backwash, external / internal): 80 vol. %

Regeneration (Co-current)

• Regenerant: HCl, H₂SO₄, HNO₃
• Regenerant level:
  • HCl: approx. 150 g/l
  • H₂SO₄: approx. 200 g/l
  • HNO₃: approx. 250 g/l
• Regenerant concentration:
  • HCl: approx. 7.5 wt. %
  • H₂SO₄: approx. 10 wt. %
  • HNO₃: approx. 12 wt. %
• Linear velocity (regeneration): approx. 5 m/h
• Linear velocity (rinsing): approx. 5 m/h

Conditioning

• Conditioning agent: NaOH
• Conditioning level:
  • Mono-Na⁺ form: 40 - 48 g/l
  • Di-Na⁺ form: 80 - 96 g/l
• Conditioning concentration: approx. 4 wt. %
• Linear velocity (conditioning): approx. 5 m/h
• Linear velocity (rinsing): approx. 5 m/h
• Rinse water requirement: approx. 5 BV

Additional Information

• Safety: Avoid contact with strong oxidants like nitric acid. Observe safety data sheet.
• Disposal: Dispose according to European waste nomenclature.
• Storage: Store above freezing point, dry, under roof, out of direct sunlight. If frozen, thaw gradually at ambient temperature.

---

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