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Macroporous (macroreticular) polystyrene based resin derivatized with iminodiacetic acid groups. High affinity for heavy metal cations over alkali or alkaline earth metals. The macroreticular structure provides high resistance to osmotic shock and short ion diffusion paths resulting in improved kinetics. The apparent selectivity for a given metal depends upon concentration, the presence of other species, and pH. The affinity of the resin for a given metal can be increased or decreased by adjusting the pH. Many feed streams contain particular matter which can clog the exchanger bed. Backwashing is necessary at regular intervals. If glass columns are used, the swelling (hydraulic expansion) of the resin must be considered. The resin swells 100 % during change from the hydrogen to monovalent salt form. Thus regeneration is best done in a funnel first with 10 % acid, then 10 % caustic and finally water to neutrality of the eluent.
To obtain the desired pH, buffer solutions are preferably used. As an example, for pH 4, 10 bed volumes of a 0.5 M solution of NaH₂PO4/Na₂HPO4 adjusted to pH 4 and finally10 volumes of water are percolated. As SERDOLIT® Chelite® CHE has an extremely high affinity for polyvalent cations, the amount of regenerant is higher than required for conventional weakly acidic ion exchange resins.
Cation exchanger with high selectivity for heavy metal ions. Chelating ligand: iminodiacetic acid; sodium form. Maximum working temperature:
90 °C (190 °F Na⁺ form; 70 °C (160 °F) H⁺ form.

Cross Linkage Capacity Particle Size Loss on Drying

6 % DVB 1.2 eq/l 20 - 50 mesh (0.3 - 0.8 mm) 65 - 75 %

HS: 39140000
Storage Temperature: +15 °C to +30 °C

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Thursday, May 24, 2012

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