LEWATIT® MDS TP 260

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:

• fine polishing of brine fed to chloralkali membrane cells, e.g. by removal of Ca²⁺, Mg²⁺, Ba²⁺, Sr²⁺; in the absence of Fei³⁺-ions
• antimony (Sb) and tungsten (Bi) removal from copper containing electrolyte
• uranium (U) removal from crude phosphoric acid
• titanium (Ti) removal from recycled battery acid
• aluminum (Al) removal from urea solutions
• lead (Pb) and strontium (Sr) removal from BF,- containing waste water out of PCB production
• removal of iron(II), nickel and zinc from 5 % gluconate containing liquid metal working solutions

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:

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