Polymeric Adsorbents
Polymeric adsorbents are synthetic particles that retain molecules on their porous surfaces. Pore size and polymer chemistry determine which organic compounds can attach to the surface.
In grades without ion exchange groups, separation does not involve cation or anion exchange. Compounds are retained through interactions with the polymer surface, also influenced by the liquid composition.
Technical Specifications
| Polymer structure | Porous aromatic styrene / divinylbenzene polymer |
|---|---|
| Functional group / ionic form | None / none |
| Appearance | Spherical beads |
| Moisture retention | 54.2–62.8% |
| Particle size | 300–1000 µm |
| Micropore diameter (hypercrosslinked type; nitrogen adsorption) | 1.5 nm |
| Pore volume (nitrogen adsorption) | 0.35 mL/g |
| Surface area (nitrogen adsorption) | 1025 m²/g |
| Specific gravity | 1.02–1.04 |
| Shipping weight | 632–662 g/L |
Application and use
- For organic pollutants in water, suitable grades capture compounds such as phenols or selected pesticides; breakthrough must be established for the actual feed.
- In process-stream purification, adsorption can separate target organics from the liquid while an appropriate elution step recovers the retained fraction.
- For food or bioprocess streams, verify the selected grade’s product-contact suitability and separation behavior under the intended cleaning cycle before use.
Frequently asked questions
Does the largest surface area always give the best separation?
No. A molecule must reach the internal surface; inaccessible pores do not contribute to its capture. Strong retention can also make recovery harder.
Does regeneration destroy the captured pollutant?
Do not assume destruction. Elution transfers retained material into another stream, which needs its own recovery or treatment route.
Does a broad pH stability range guarantee the same removal at every pH?
No. Stability describes the material, while adsorption depends on the target molecule, surrounding liquid and polymer interactions. Verify removal with the actual feed.
Can a grade used for one pollutant be used for another?
Not by family name alone. Polymer chemistry, accessible pore structure and molecule properties change affinity and working loading; compare the actual feed.
Is every adsorbent suitable for food or bioprocess contact?
No. Request the exact grade’s documented product-contact suitability and cleaning conditions before proposing this use.