Weakly Acidic Cation Exchange Resins
Weakly acidic cation exchange resins are weakly acidic IERs that have carboxylic acid groups as ion-exchangable groups, as Figs 1 and 2. DIAION™ WK10, made from methacrylic acid, and DIAION™ WK40, made from acrylic acid, are in this grouping.
Methacrylic Type DIAION™ WK10 Series
WK10 grades (methacrylic-type) are weak acid cation exchange resins having carboxylic acid functionalities. They have a pK value of approximately 6. WK10 has high reaction rate, and WK11 has a high total exchange capacity. These grades are mainly used for special applications such as purification of pharmaceuticals, foods and organic chemicals.WT01S has high reaction rate and high adsorption capacity. It is mainly used for the purification of pharmaceuticals and foods. WT01S is offered in 100-300 μm particle distribution.
Acrylic Type Relite™ WK60L
WK60L is weak acid cation exchange resin with carboxylic acid functionality based on porous acrylic polymer matrix. It has a pK value of approximately 5.3. The acrylic type WK60L resin has a higher total capacity than methacrylic type resins. It is mainly used for water treatment applications for removal of hardness ions in the presence of bicarbonate alkalinity.
| Grade Name | DIAIONTM WK10 |
DIAIONTM WK11 |
DIAIONTM WT01S |
ReliteTM WK60L |
|---|---|---|---|---|
| Chemical Structure |  |
 |
||
| Whole Bead Count | 95 min. | |||
| Shipping Density (g/L: approx.) |
635 | 660 | 750 | 770 |
| Salt Spliting Capacity (meq/mL-R) |
2.5 min | 2.9 min | 3.0 min | 4.4 min |
| Water Content (％) |
53 - 59 | 45 - 52 | 45 - 55 | 43 - 50 |
| Particle Size Distribution on 1180 μm (％) through 300 μm (％) through 425 μm (％) |
5 max. 1 max. |
300 - 1060μm 85 % min. |
10 % max. - 5 % max. |
|
| Effective Size (mm) | 0.40 min. | 0.10 - 0.14 | 0.45 min | |
| Uniformity Coefficient | 1.6 max. | |||
| Effective pH Range | 5 - 14 | 4 - 14 | ||
| Operating Temperature (℃) | 150 max. | 120 max. | ||