47
M12/M15/M18
7. Functional Units 7.
The distillation process runs according to the following description:
Start
The distillation system starts automatically when the vacuum is built up, even before solvent is
pumped to the distillation system.
Filling
When the pre-selected vacuum is reached, the vacuum causes solvent to be suctioned to the
distillation system (the solvent pump assists).
The filling process ends when either:
a) The filling time has expired
b) Air is suctioned in or
c) The level probe in the still cuts off.
Pre-distillation
Pre-distillation begins automatically when a), b) or c) occurs.
The still heats up to the preliminary temperature for the 1
st
fraction. The low-boiling solvents
evaporate and flow to the condenser. This distillate is extracted over the flash tank by the condenser
and drained to the extraction tank.
The main distillation process takes place after this preliminary phase.
Main distillation
The still heats up to the solvent's boiling point (2
nd
fraction).
This distillate is extracted over the flash tank and drained to the water separator.
The distillation process ends when a pre-selected bottom temperature has been reached in the still.
The vacuum pump switches off. The red reference lamp on the distillation system lights.
The vacuum stays at its level at the time.
Measures to guarantee safety during distillation:
- The vacuum is continuously checked
- Overfill preventer
- Monitoring of the temperature of the condensate, and the distillation process at the bottom of
the still.
- You can only open the distillation system door when it has cooled off and maintenance has
been run. This is the only time when the system is vented. Green reference lamp lights.
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