Powdered activated carbon is used in liquids to remove unwanted colour, odour and trace impurities. It is usually added in a batch process near the last stage of making a product: a measured dose goes into the solution, is stirred for a set contact time (often at higher temperature), then filtered out to leave a clear, colour-free liquid.
Besides decolourising, it can give a longer shelf life, cleaner crystals and tighter melting and boiling points in the finished product.
Specification
| Parameter | Unwashed | Acid-Washed |
|---|---|---|
| Particle Size | 325 mesh | 325 mesh |
| Iodine Value | 800 - 1000 | 800 - 1000 |
| Methylene Blue | 150 - 300 | 150 - 300 |
| Ash | 12% max. | 4% max. |
| pH | 8 - 10 | 6 - 7.5 |
| Moisture | 8% max. | 8% max. |
| Packing | 25 kg bags | 25 kg bags |