CH500
CH500 is a macroporous polystyrene chelating resin with iminodiacetate groups. Main application: brine decalcification (softening). Key advantages: high working exchange capacity and good osmotic stability. Suitable system: chlor-alkali processes.
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Product Introduction
CH500 is a macroporous polystyrene chelating resin with iminodiacetate groups. Main application: brine decalcification (softening). Key advantages: high working exchange capacity and good osmotic stability. Suitable system: chlor-alkali processes.
Typical Physical & Chemical Properties
| Polymer matrix | Macroporous polystyrene crosslinked with divinylbenzene |
|---|---|
| Appearance | Spherical granules |
| Functional group | Iminodiacetate |
| Ionic form | Na+ form |
| Cu exchange capacity (min) | 50 g/L |
| Water retention | 52–60 % (Na+ form) |
| Particle size distribution | 425 - 1000 µm |
| < 425 µm | (max) 2 % |
| Uniformity coefficient (max) | 1.5 |
| Swelling, H+→Na+ (max) | 35 % |
| Specific gravity | 1.18 |
| Packaging density (approx.) | 750 - 800 g/L(46.9 - 50.0 lb/ft³) |
| Operating temperature range | 80 °C(176.0 °F) |
Handling, Storage & Loading Notes
- Transport & storage. Store the resin in its wet state, preferably above 0 °C. For long idle periods, keep the container closed or add brine of ≥5% NaCl. Protect from freezing during transport, and do not stack heavy objects on top of the resin to avoid crushing the beads.
- Pre-treatment. For general requirements, one alkaline → water → acid → water cycle is sufficient; for strict requirements, perform three cycles and finish with the required ionic form.
- Loading. Allow for the swelling on form conversion and leave enough freeboard to prevent overflow while keeping a proper liquid level. Keep the column aspect ratio in a reasonable range to avoid channeling. Load wet or backwash to remove air bubbles from the bed.
- Feed quality. Before entering the resin column, the liquid should be coagulated, filtered or sand-filtered to ensure it is free of suspended solids that could clog the resin pores.
- Idle columns. Resin left idle in a column for a long time must be washed out and stored clean, or kept submerged in brine; it must never dehydrate. Backwash from time to time to loosen the bed and prevent caking.