Lewatit® TP 260 is a weakly acidic cation exchange resin with chelating amino methyl phosphonic acid groups for the selective removal of trasition heavy metals and alkaline earth cations. The monodisperse beads are mechanically and osmotically stable. The optimized kinetics lead to an increased operating capacity compared to ion exchange resins.
Divalent cations are removed from neutralized waters in the following order: Uranium (UO 2) > Lead > Copper > Zinc > Nickel > Cadmium > Cobalt > Magnesium > Strontium > Barium >>> Sodium.
It is e. g. suitable for use in:
In brine purification the operating capacity of Lewatit® 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 260 has to be continued with caustic soda solution after every regeneration cycle/before every exhaustion cycle.
After the conditioning it is in disodium form for the final polishing of chlorakali brine feed. In other applications the operating capacity depends strongly on the process conditions.
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) at absence of iron (III) ions and in case of low demand on Sr and Ba removal.
Business Unit
Liquid Purification Technologies
Area of application
How to use the product:-
CAS Number
114060 – 55 -8
Synonyms
Weakly acidic chelating grade resin