Lewatit®

LEWATIT® MDS TP 208

Lewatit® MDS TP 208 is a weakly acidic, macroporous cation exchange resin with chelating iminodiacetic acid groups designed for the selective removal of alkaline earth cations. lt is a small bead variant of Lewatit® MonoPlus TP 208 with excellent kinetic performance.


The monodisperse, uniform sized beads of Lewatit® MDS TP 208 are mechanically and osmotically more stable than ion exchange resin beads with heterodisperse bead size distribution. Additionally they offer superior kinetic behavior which leads to faster uptake of cations and a better utilization of capacity. Due to its modified polymer structure and substitution grade it is particular suitable for the adsorption of alkaline earth and heavy metal cations from diluted and concentrated brine solutions. Therefore Lewatit® MDS TP 208 is commonly used for following application:

  • fine polishing of brine fed to chloralkali membrane cells, e.g. by removal of Ca2, Mg2, Sr2; also in the presence of Fei ions


Smaller bead size requires adaption of backwash linear velocity and duration, upflow conditioning and suspended solid load control.


Lewatit® MDS TP 208 offers following advantages compared to the standard Lewatit® MonoPlus TP 208 and Lewatit® TP 208:

  • up to 100 % higher operating capacity without requiring additional regenerant chemicals
  • lower leakage levels
  • improved Strontium and Barium removal efficiency


Aside from its major application in brine purification Lewatit® MDS TP 208 is used for the removal and recovery of heavy metals out of process, waste and potable water streams. Those metal cations are removed from neutralized waters in following order (decreasing affinity):


Copper > Vanadium (V02) > Uranium (U0221 > Lead > Nickel > Zinc > Cadmium > Cobalt > Iron (II) > Beryllium > Manganese » Calcium > Magnesium > Strontium > Barium >>> Sodium.

 

 

Product Group: Cationic
Applications
  • Chemical Industry
  • Flue Gas
  • Industrial water
  • Metal industry
  • Potable water treatment
  • Purification
  • Recycling
  • Removal
  • Softening
  • Softening of potable water
  • Waste water treatment
  • Water Treatment

Technical Data sheet

Safety data sheet

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