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In this installation, the SD1 pilot spray drying tower is integrated into a closed loop air circuit. This means that the outlet air is treated (washed, filtered and desaturated) in order to be again ejected into the drying tower by atomization and that one can work with an oxygen concentration lower than 6%.
The advantage of this circuit is that since the oxygen concentration is low, there is no longer a risk of explosion. On the other hand with this system, it is possible to work with solvents.
The fact that the circuit is suitable for a pilot tower makes it possible to carry out small-scale drying tests.