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Comparative advantages of fixed bed and batch ion exchange processing are discussed. When no complementary phenomena occurs, the choice of one of the two techniques is based on a comparison between their respective adsorption efficiency for equal values of process duration, phases amounts and ionic compositions. Analytical solutions are suggested to determine efficiency out of processing parameters when completely selective ion exchange is involved. IN THE ion exchange the most simple techniques are the batch (static) and the fixed bed processes.
While in the adsorption unit operation the static process is often employed, in the ion exchange this process is uncommon. In the physicochemical determinations of the ion-exchange characteristics, the batch technique is preferred because it permits an easier interpretation of the experimental data, but most of the analytical and preparative applications of ion exchange are carried out by the fixed bed technique. As a rule, the batch is reserved to particular cases of ion exchange, i.e. those accompanied by some complementary phenomena.
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