Buchi Nano B-90, Operation Manual

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4 Description of function
30
B-90 Operation Manual, Version B
4.8 Inert Loop B-295
The Inert Loop B-295 is an accessory to enable the safe spray drying of organic solvents in a ‘closed
loop’ configuration. It comprises a cooling unit with pressure and oxygen monitoring elements and
safety controls. Communication to the Nano Spray Dryer B-90 Advanced is established via a commu-
nication cable.
T
COOL
Exhaust gas
Dehumidifier
B-296
Product
a
b c
a
Exhaust gas to fume hood or glove box ventilation
outlet
b
Solvent condensate
c
Condensation and cooling unit
Functional principle:
• The inert drying gas (N
2
or CO
2
) is loaded with solvent from the spray drying process.
• The loaded gas enters the Inert Loop B-295 and is cooled down in its internal preheat exchanger.
• The solvent is condensed in the refrigerator and collected in a closed bottle.
• Subsequently, the cleaned and cooled gas stream is heated up in the preheat exchanger and flows
back through an Aspirator to the Nano Spray Dryer B-90 Advanced.
Dehumidifier B-296
If mixtures of organic solvents and water are used in ‘closed loop’ configuration, BUCHI strongly
recommends to install the additional Dehumidifier B-296. The Dehumidifier B-296 is condensing
the water to prevent water from entering the Inert Loop B-295. This is necessary to protect the heat
exchanger in the refrigerator from water freezing and potential damage.