Macroporous Strong Acid Cation Resin
Macroporous strong acid cation resin is a polymer material with sulfonic acid groups and permanent pores. It exchanges positively charged ions in water for sodium or hydrogen ions held on the resin.
It has the same ion exchange groups as gel-type resins but a different polymer structure. Permanent pores are present in the bead in addition to the spaces created by swelling in water.
Technical Specifications
| Polymer structure | Divinylbenzene-crosslinked macroporous polystyrene |
|---|---|
| Functional group | Sulfonic acid |
| Ionic form | Na⁺ |
| Total exchange capacity (Na⁺) | 1.76 eq/L |
| Moisture retention (Na⁺) | 46.5–53% |
| Particle size | 409–1197 µm |
| Uniformity coefficient | 1.48 |
| Specific gravity | 1.25 |
| Particle density | 1.27 g/mL |
| Shipping weight | 774–807 g/L |
Application and use
- In hot-process or high-TDS softening, appropriate sodium-form grades are evaluated for the thermal and dissolved-salt load of the service cycle.
- In condensate polishing, the selected cation grade must match the condensate chemistry and, where used, the companion anion resin.
- For industrial demineralization, hydrogen-cycle operation requires acid regeneration and hydraulic conditions suited to the selected grade.
Frequently asked questions
Does improved oxidation resistance remove the need for oxidant control?
No. Oxidants can still damage the polymer. A more resistant grade does not justify uncontrolled chlorine exposure.
Must a pressure-drop increase be solved by replacing the resin?
Not automatically. Retained solids, bed compaction or poor classification may restrict flow. Investigate the hydraulic cause before deciding on replacement.
When should a macroporous SAC grade be considered?
Evaluate it for hot or high-TDS softening and condensate polishing against actual temperature, salinity, oxidants and mechanical duty; porosity alone does not prove suitability.
Can a sodium-form grade be used for hydrogen-cycle demineralization?
Confirm the selected grade’s conversion, acid regeneration and hydrogen-form limits, together with the companion anion stage.
Is its operating capacity necessarily higher than a gel grade?
No family-wide ranking follows. Compare actual grades under the same feed and regeneration conditions; total capacity alone does not establish service-run length.