The strongly acidic cation exchange resin is bead-like product which has a sulfonic acid group in the cross-linked styrene frame. They can be used across the full pH range (0-14), and are relatively stable to temperature, even withstanding high temperatures of 100-120℃. They are used in a wide variety of fields including water purification, water softening, wastewater treatment, purification of pharmaceuticals and food, and catalysis.
The sulfonic acid group (-HSO3) is the exchange group and behaves like a strong acid, dissociating to (-SO3)- and H+ even in acidic solutions, not to mention in alkaline solutions.
There are a gel type, a porous type, and a uniform bead size type.
An ion exchange reaction is simply a pair of ions changing places. The reactions shown below illustrate this process for a strongly acidic cation exchange resin. Salts such as NaCl and CaCl2 or a base such as NaOH can undergo the ion exchange reaction when exposed to the resin in solution.
R－SO3H ＋ NaCl → R－SO3Na ＋ HCl
2R－SO3H ＋ CaCl2 → (R－SO3)2Ca ＋ 2HCl
R－SO3H ＋ NaOH → R－SO3Na ＋ H2O
(R represents the ion exchange resin matrix.)
Although the strongly acidic cation exchange resin adsorbs all positive ions, the adsorption strength depends on the type of ion. The index of this strength is called selectivity. In general, selectivity will increase as the ion valence increases. (For example, Na+ ＜ Ca++ ＜ Al+++ ＜ Th++++.) For the same valence, selectivity increases as atomic number increases. (Li+ ＜ Na+ ＜ K+ ＜Rb+ ＜ Cs+, Mg++ ＜Ca++ ＜ Sr++ ＜Ba++)
Lanlang ® TC007FG
Food Grade gel type strongly acidic cation exchange resin
Used for softening potable water and water for foods and beverages.
Lanlang ® TC007FG is a premium food grade gel type strongly acidic cation exchange resin produced by sulfonated styrene-divinylbenzene (DVB) copolymers in standard Gaussian size distribution. TC007FG is in compliance with US FDA 21 CFR 173.25 and NSF/ANSI 61 qualified with WQA Gold Seal Certificate. It has excellent chemical, physical and thermal stability. Its good ion exchange kinetics gives high efficiency for uses in both regenerable softeners and non-regenerable cartridges.
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