Lewatit® MDS TP 260 is a weakly acidic, macroporous cation exchange resin with chelating amino methyl phosphonic acid groups designed for the selective removal of heavy metal and alkaline earth cations. lt is a small bead variant of Lewatit® MonoPlus TP 260 with excellent kinetic performance. Divalent cations are removed from neutralized waters in following order (decreasing affinity):
Uranium (U022+ > Lead > Copper > Zinc > Nickel > Cadmium > Cobalt » Calcium > Magnesium > Strontium > Barium >» Sodium.
The monodisperse, uniform sized beads of Lewatit® MDS TP 260 are mechanically and osmotically more stable than ion exchange resin beds with a 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 suitable for the following applications:
Smaller bead size requires adaption of the linear velocity and duration for backwash, downflow conditioning and suspended solid load control.
Note:
In secondary brine purification of brine fed to chloralkali electrolyzer membranes Lewatit® MDS TP 260 offers following advantages compared to the standard Lewatit® MonoPlus TP 260 and Lewatit® TP 260: