BÜCHI
Mini Spray Dryer
B-290
/
BÜCHI
Inert Loop
B-295
Quick Operation Guide
Switch instrument on,
switch aspirator on
Set cooling temperature
on Inert Loop B-295
Feed nitrogen be opening
spray flow valve
Heater and feeding ready
to be started
Start with
pure solvent
Adjust Nozzle
cleaning
Change from pure
solvent to product
Change to
pure solvent
O
2
level <6% is reached
Spray Drying in process
Temperatures constant
Solvent
recovery
Inert Loop starts to cool, both signal lamps are on (after
20 sec.). When starting the aspirator, pressure signal
lights off: gas stream is circulating. 100% recommen-
ded for efficient drying and best separation in cyclone.
The set cooling temperature depends upon the solvent
used. For boiling point <70°, -20° is recommended, for
pure water, 10° must not be fallen below.
Nitrogen is fed into the cycle and the same volume is
leaving the system by the exhaust tube. The level of
oxygen is decreasing. If not, check tightness to find
leakage.
The system is now under inert condi-tions; heater is
started. The procedure is equal as on the back side.
Inlet temp. approx. + 10°C above boiling point of sol-
vent.
Pure solvent is used to get the drying conditions. High-
er pump rates can be used, typical set point is 60%.
In case of suspensions or product which tend to clog
the nozzle, the nozzle cleaning is switched on. Higher
number (2-9) means more cleaning pushes.
The spray drying starts as soon as the tube is swit-
ched from solvent to product (by feed switch valve or
manually).
At the end of the process, switch back to pure solvent
to clean tube and nozzle. Additional cleaning effect by
air bubbles.
Empty receiving bottle in Inert Loop B-295.
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