Unit operation
Drying toll manufacturing: ANFD, RVD and tray dryers
For wet cakes and slurries that need to leave as a dry, specified powder — often the last step before a product is yours to sell.
Live listings
No verified unit lists Drying capacity yet. Listings appear here the day our desk approves them, and the guide below is how we qualify one when it does.
Post your requirement and our broker desk looks for the capacity by hand, or list your own unit if you run one.
What drying on job work involves
Drying is bought as toll manufacturing (job work) whenever a wet cake, a paste or a slurry has to become a powder with a stated moisture or loss-on-drying, and the client’s own site lacks the dryer, the containment or the solvent-handling permits. It is frequently paired with filtration and crystallisation at the same plant, so the material never travels wet.
The dryer decides the product. Agitated nutsche filter dryers filter, wash and dry in one closed vessel and suit solvent-wet pharma and agro intermediates. Rotary vacuum dryers handle heat-sensitive material at low temperature. Tray dryers are simple and forgiving for small lots; fluid-bed dryers give short residence times for free-flowing granules. Each leaves a different particle and a different bulk density.
What to check before you send an enquiry
The questions our desk puts to a unit before it qualifies an enquiry for Drying. A listing answers most of them; the trial batch answers the rest.
- Dryer type against your material — closed ANFD or RVD for solvent-wet and potent solids, tray or fluid-bed for water-wet, robust powders.
- Achievable end point: the moisture or LOD the plant reaches on comparable material, and the drying curve from the trial batch.
- Solvent vapour route: condenser and recovery for solvent-wet cakes, and the hazardous-area classification of the drying room.
- Dust-explosion controls for fine organic powders — inert gas, grounding, explosion venting or suppression on the dryer.
- Cleaning and containment: product-contact surfaces, cleaning validation between products, and whether GMP records are kept if your material needs them.
Where the capacity is
Pharma-grade closed drying concentrates in Pashamylaram, Jeedimetla and JN Pharma City; Ankleshwar and Panoli hold agro and intermediate drying beside their reactors; Vatva dries and standardises dyes.
Unit operations
Industries served
Common questions
- What is toll drying?
- Toll drying is paying a plant to remove moisture or solvent from your material on its own dryers and return it to an agreed specification. You keep ownership of the material; the plant supplies the dryer, the utilities, the handling and usually the analysis that proves the result.
- Which type of dryer suits which product?
- Tray and vacuum tray dryers suit small, heat-sensitive or sticky batches. Rotary vacuum and conical dryers suit larger solvent-wet cakes where contained handling matters. Fluid-bed dryers suit free-flowing granules and are fast. Spray dryers suit a pumpable slurry or solution that has to come out as powder. The wet material’s form decides this more than the volume does.
- Can solvent-wet cake be dried on job work?
- Yes, but only at a unit built for it: closed charging, a condenser and receiver to recover the solvent, nitrogen blanketing where the solvent is flammable, and the approvals to store and handle it. Ask what happens to the recovered solvent and whether it is returned to you or treated as waste.
- How is drying performance specified?
- By a moisture or solvent limit measured a stated way, usually loss on drying at a set temperature and time, or Karl Fischer for water. Agree the limit, the method and the sampling point before the trial batch, and ask how long the dryer needs to reach it, because cycle time is what the price is built on.
Other unit operations
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