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Lewatit®TP 260 is a weakly acidic, macroporous cation exchange resin with chelating amino methyl phosphonic acid 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:
»    secondary purification 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 260 depends on the pH-value of the brine.

At pH 10 it is approx. threefold that achieved at pH 8. At pH 10 and calcium content of 5 ppm, a capacity up to 16 g Ca/l  Lewatit® TP 260 (volume of of total sodium form) is obtained. At a service flow rate of 20-30 BV/h, the residual calcium values are well below 10 ppb. Greater security can be achieved by operating two units of equal size in series (see our Technical Information SP IOW 4006e).

Lewatit® TP 208 has to be continued 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.

The special properties of this product can only be fully utilized if the technology and process used correspond to the current state-of-the-art. Further advice in this matter can be obtained from LANXESS, Business Unit Ion Exchange Resins.


Ion Exchange Resin