page 34 of 51
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999073 / 15/12/2009
How to determine the best distillation conditions
Determine the temperature of the available coolant.
☞
In most cases the coolant temperature is given (e. g. tap water, in house cooling water circuit). For
maximum solvent recovery, carefully choose the boiling point of the product (by choosing the vacuum
level) and the bath temperature accordingly.
☞
Determine the lowest boiling point of the product (solvent).
☞
The temperature difference between boiling point of the product and the coolant should be more than
20°C, otherwise a low vacuum level will lead to significant loss of solvent.
☞
Select a water bath temperature of 20-30°C above the boiling point of the product to provide sufficient
heat transfer.
Determine the temperature of the bath.
☞
If there is no limitation from the product side, a water bath temperature of 60-70°C is usually recom-
mended (efficient heating with minimum generation of water vapour from the bath).
Example: Vacuum selection for a boiling temperature of 40°C (e. g. ethanol):
☞
The temperature of the coolant shouldn’t be higher than 15-20°C.
☞
Set water bath temperature to 40°C. Wait until temperature is reached.
☞
Determine the vacuum level (for ethanol: 175 mbar) for a boiling point (use published data of solvents).
Reduce pressure until a sufficient level of evaporation is attained or use the mode ”AUTO” of the
controller (distillation fully automatically).
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