BUCHI Inert Loop B-295 - Manual (Page 25)

4 Description of function
25 B-290 Operation Manual, Version I
4 .6 Spray chilling accessory
During spray chilling a hot melt is dispersed into a cold gas stream. The droplets are solidified into
particles and are separated. The matrix substance and the active ingredients are heated above the
melting point. Highest melting point is 70 °C. The nozzle is also heated to prevent any blocking. No
additional thermostat is required, as the existing heating control and peristaltic pump in the instrument
are used. If the sample has a low melting point, then the inlet air is cooled to increase the temperature
gradient. If lower temperatures than 10 °C (provided by the B-296) are used, e.g. for hard fats, the
inlet air can be cooled to –5 °C by using a specially developed refrigeration unit (please contact your
local distributor.
1
2
3
4
5
a Temperature sensor
b Circulating heating liquid to bath – nozzle –
peristaltic pump – bath
c Cold gas
d Heated feed sample
e Droplets spray
Fig. 4.5: Functional principle of the sample feed and dispersion
4 .7 Connected accessories to the Mini Spray Dryer B-290
1 2 3 4
a Serial port RS-232 for data output to a PC
b Connection for the remote control panel
c Connection for Inert Loop B-295
d Connection for feed switch valve
Fig. 4.6: Rear connections of the Mini Spray Dryer B-290