Transcription of Fundamentals of Ion Exchange - Lenntech
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Fundamentals of Ion Exchange - Lenntech
Dow Liquid SeparationsFundamentals of Ion ExchangeBased on a paper by:R. M. Wheaton Dow Chemical J. Lefevre Dow Chemical Exchange Tel. + Fax. Tel. + Fax. +31-152-616-289 LenntechFundamentals of Ion ExchangeIon Exchange is the reversibleinterchange of ions between a solid(ion Exchange material) and a liquidin which there is no permanentchange in the structure of the Exchange is used in watertreatment and also provides a methodof separation in many non-waterprocesses. It has special utility inchemical synthesis, medical research,food processing, mining, agricultureand a variety of other utility of ion Exchange rests withthe ability to use and reuse the ionexchange material. For example, inwater softening:2 RNa++ Ca2+$R2Ca2++ 2Na+The exchanger R in the sodium ionform is able to Exchange for calciumand thus, to remove calcium fromhard water and replace it with anequivalent quantity of , the calcium loadedresin may be treated with a sodiumchloride solution, regenerating it backto the sodium form, so that it is readyfor another cycle of operation.
applicable for the selective exchange of various heavy metals from alkaline earth and alkali metal solutions[2]. Polymer Matrix. The structure and porosity of an ion exchange resin are determined principally by the conditions of polymerization of the backbone polymer. Porosity determines the size of the species, molecule or ion, that may enter a
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