Tannins are water-soluble products applied for curing of fresh leather. The spray drying process offers a gentle way to preserve the activity of these materials. The spray died powder can readily be re-dispersed in water for use in the tanning process.
Tanning materials can be divided into two groups:

• Natural tannins which are extracted from woods, barks and fruits ( Quebracho, Wattle, Divi-Divi, etc.)
• Synthetic tannins, such as chemical chrome tanning material ( basic chromium salts )
  

The corrosive and abrasive nature of some of these tannins requires our experience in applying special materials and designs to product-contact parts and feed/product handling systems to ensure a plant's durability and trouble-free operation.
We have supplied many co-current-flow spray dryers with a high-speed rotating atomizer wheel and nozzle towers in combination with powder conveying and agglomeration systems to the tannin industry worldwide.