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The
Polaris technology for drying in closed circuit is based on
total or partial recycle of the gaseous stream used in the drying
system, in order to optimise the recovery of the separated compounds
and to minimise the flowrate of the effluent emitted by the
drying system.
Polaris has realised complete
drying plants, in particular spray-drier for pharmaceutical
industry, where particular conditions or product specifications
are required (e.g. amorphous product), in presence of solvents,
with integrated recovery of the separated solvents.
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In other cases Polaris has realised
the closed circuit and the integrated recovery system associated
to an existing dryer at the customer facility. Several systems
have been done on fluid bed dryers or tunnel dryers.
Where possible, the achievement
of the closed circuit allows less investment and operating
costs. Where the system works in inert atmosphere, the closed
circuit allows the almost total recovery of the nitrogen used.
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