Buchi R-210, Operation Manual

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6 Operation
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R-210/215 Operation Manual, Version B
ATTENTION
Risk of overfl owing.
When you are operating with a 5 l heating bath, make sure that the controller is confi gured in a
way that the fl ask is not automatically submerged into the heating bath to avoid an overfl owing of
the heating bath due to displacement. Introduce the fl ask manually instead.
After the set vacuum has been reached, wait for about 1–2 minutes to see whether distillation
begins.
If the distillation does not start, optimize the parameters (decrease the pressure gradually or
increase the bath temperature).
Both possibilities lead to an increased distillation capacity, see also chapter 6.6.
6.6 Optimizing the distillation conditions
Depending on the solvent being distilled the distillation might have to be re-optimized. In the optimized
case, the condenser should be steamed up to between 2/3 to 3/4, see fi gure below.
If this is not the case, there are two possibilities to optimize the distillation:
When the heating bath has reached 60 °C slowly reduce the pressure. Thus, the boiling point of
the solvent is reduced and
Δ T
1
increases resulting in an increase of distillation capacity.
When the heating bath has reached 60 °C increase the bath temperature. Thus
Δ T
1
increases
resulting in an increase of distillation capacity as well.
NOTE
When the bath temperature is increased, not all of the additional energy is used for distillation but a
major part is discharged into the environment due to the increasing difference between heating bath
and the ambient temperature.
3/4
Fig. 6.6: Optimal condensation area of a condenser
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