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 The following is a specific description of the cation exchange resin. 

 Cation resin ion exchange (ion exchange process) ions in the liquid phase and solid phase ion between the a reversible chemical reaction when certain ions in the liquid phase more ion exchange solid preferences, they will be ion exchange solid adsorption power to maintain the aqueous solution of neutral and ion-exchange solid must be released back to the solution of equivalent ion. 
 Classification of the cation exchange resin 
 (1) strong acid cation resin such resins (IONRESIN) contains a lot of strong acid groups, easy dissociation in solution, H +, it was strongly acidic. Resin after dissociation, the ontology contains negatively charged groups, such as SO3-, adsorption with the other cations in solution. These two reactions to the resin in the H + exchange with the cations in the solution. The color can be SHINES strong acidic resin dissociation ability of a strong acidic or alkaline solution can be away from the solution and produce ion exchange interaction. In use for some time, the resin regeneration treatment by chemicals, ion exchange reaction in the opposite direction, so that the resin functional groups to reply to the original state for re-use. Such as the above-mentioned cationic resin with acid regenerating the adsorption of cationic resin release, with H + to combine and restore the original composition. (2) such as weak acid cation resin resin (IONRESIN) containing weak acid groups such as carboxyl group-COOH, in water from the solution of the H + and acidic. The color can SHINES the remaining resin dissociation of negatively charged groups, such as R-COO-(R is hydrocarbon groups), and other cations in solution adsorption with the resulting cation exchange. The acidity of the resin that dissociative weak at low pH is difficult to dissociation and ion exchange, only in alkaline, neutral or slightly acidic solution (such as pH5 - ~~ 14) work. The color can SHINES resin with acid regeneration (regeneration) more easily than the strong acid resin. 
 The adsorption capacity of cationic resin of different ions 
 Cation exchange resin, the strength of the order of the different cation adsorption capacity cation exchange resin adsorption capacity of the different cations in solution, in general, monovalent ions on the adsorption capacity of the charged ions is greater than the low-cost ion adsorption capacity; ion adsorption capacity of the large diameter is greater than the small-diameter ion adsorption capacity. The strength of the order of the common cation adsorption capacity is as follows: Fe3 +> Al3 +> Pb2 +> Ca2 +> Mg2 +> K +> Na +> H + 

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