Strongly acidic cation exchange resin is an ion exchange resin with sulfonic acid group (-SO3H) on the polymer matrix of styrene polymer cross-linked structure. It can be used in alkaline, neutral, It shows ion exchange function even in acidic media. This product has the characteristics of high exchange capacity, fast exchange speed and good mechanical strength. The original brand number of this product is 732#. Mainly used for hard water softening, pure water preparation, hydrometallurgy, rare element separation, antibiotic extraction, etc.
(1) Strongly acidic cationic resin
This type of resin contains a large number of strong acidic groups, such as sulfonic acid groups -SO3H, which can easily dissociate to H+ in solution, so it has a strong acidic. After the resin is dissociated, the negatively charged groups contained in the body, such as SO3-, can adsorb and bind other cations in the solution. These two reactions exchange H+ in the resin with cations in the solution. Strongly acidic resin has a strong dissociation ability and can dissociate and produce ion exchange in acidic or alkaline solutions.
After the resin is used for a period of time, it needs to be regenerated, that is, chemicals are used to make the ion exchange reaction proceed in the opposite direction, so that the functional groups of the resin return to their original state for reuse. As mentioned above, the cationic resin is regenerated with strong acid. At this time, the resin releases the adsorbed cations, and then combines with H+ to restore its original composition.
(2) Weakly acidic cationic resin
This type of resin contains weakly acidic groups, such as carboxyl-COOH, which can dissociate H+ in water and become acidic. The remaining negatively charged groups after the dissociation of the resin, such as R-COO- (R is a hydrocarbon group), can be adsorbed and combined with other cations in the solution to produce cation exchange. The acidity of this resin, that is, the dissociation property, is weak, and it is difficult to dissociate and perform ion exchange at low pH. It can only work in alkaline, neutral or slightly acidic solutions (such as pH 5 to 14). This type of resin is also regenerated with acid (easier to regenerate than strongly acidic resins).