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   Fluid Bed Drying

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Fluid Bed

Drum coater

Vertical granulator


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Very effective type of solid drying.
Outstanding heat transfer.
Unmatched speed of drying.
Gentle product handling.
Intensive mixing of the solid material.
Uniform, reproducible product quality.




  Process advantages
Fluid bed drying represents a very effective type of solid drying (-> Drying). The whole surface of each individual particle is available for drying in the flight phase. The heat transfer is excellent and the drying time is ideal. The product is dried gently due to these factors. A homogeneous product temperature and a uniform drying of the starting product are achieved as a result of the continuous and thorough mixing. This cannot always be guaranteed in the case of contact and radiation dryers. In these cases, local hotspots are quite possible.
If only a small amount of water is to be evaporated, wet granules can also be dried directly in the Vertical Granulator: Single pot process (-> Wet Granulation in the vertical granulator).


Principles of operation
For the drying of granules, agglomerates and pellets, Glatt offers systems with different capacities according to the process requirements, starting materials and the desired product parameters:
Continuous Fluid Bed Systems with throughputs from 2
0kg to 5t/h.
Batch Fluid Bed Systems with batch sizes from
2g to 1.5t/batch.

Batch fluid bed
The moist starting product is fed batch-by-batch into the material container of the dryer for drying. Here it is mixed vigorously in the upwards-pointing heated gas stream and held in suspension. In doing so, it dries to the required end moisture content with high heat and material transition coefficients.
The optimum gas speed depends essentially on the particle size and density. Heat is fed in via the process air. The temperature of the air can be varied during the drying process. After drying, the product can be cooled before the material container is emptied and the next batch starts.

  Principle: Batch fluid bed drying
Principle: Batch fluid bed drying
Continuous fluid bed
The activities that are carried out batch-by-batch in the above process, i.e. at different times, are carried out in different places in the continuous process. Moist starting product is fed in continuously and moves through the process chamber.
Effective drying is guaranteed by different temperatures of the incoming air. If the last air chamber is operated with cold air, the dry product can be cooled before leaving the process chamber.

Principle of fluid bed drying in the continuous Glatt fluid bed:
Fluid bed drying in the continuous Glatt fluid bed (GF)
Principle of fluid bed drying in the continuous Glatt fluid bed
Fluid bed drying in the continuous Glatt fluid bed (GF)
Cooling in the last process chamber
Reproducible process

No matter which system is used – the process must be reproducible. Premature drying of the top layers of the granulate must be avoided at all costs. The effects of the weather on the drying process must be eliminated. Glatt offers fully-developed process technology and the facility to test and optimise drying processes in the Glatt laboratory (-> Process Development).

Solvent drying
For the use of organic solvents, Glatt offers circulating gas systems with proven safety for fluid bed processes and vacuum systems for fluid bed systems and vertical granulators.
(-> Solvent Recovery)

Process principles


Technical Processes


Process Principles



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