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Lewatit®MonoPlus TP 208 is a weakly acidic, macroporous cation exchange resin with chelating imino-diacetate groups for the selective removal of alkaline earth cations. The monodisperse beads are mechanically and osmotically superior stable. The optimized kinetics lead to an increased operating capacity compared to ion exchange resins with heterodisperse bead size distribution.

Business Unit
Ion Exchange Resins

Properties and benefits

It is especially suitable for use in:

  • final polishing of brine feed to chlorakali membrane cells ( traces of alkaline earth ions are removed after their normal precipitation by carbonates in the pH-range 7-11)

The operating capacity of Lewatit® MonoPlus TP 208 depends on the pH-value of the brine. At pH 11 it is approx. threefold that achieved at pH 7. At pH 9 and calcium content 2-20 ppm, the operating capacity is approx. 0.7. eg/l  Lewatit® MonoPlus TP 208 (volume of hydrogen form) is obtained. At a service flow rate of 20-30 BV/h, the residual calcium content of treated electrolysis brine is less than 0.02 ppm (20 ppb).

Greater security can be achieved by operating two units of equal size in series (see our Technical Information SP IOW 4006e).

Lewatit®MonoPlus TP 208 has to be conditioned with caustic soda solution after every regeneration cycle/before every exhaustion cycle. After the conditioning it is in di-sodium-form for the final polishing of chlorakali brine feed.


Ion Exchange Resin