BUCHI Multivapo P-12 - Manual (Page 53)

6 Operation
53 Multivapor™ Operation Manual, Version E
tend to foam or splash. A preceding terrace at high pressure for approx. 10 min usually significantly
reduces the risk of splashing or foaming.
6 .5 .3 Automatic distillation (V-855)
1 2
The method of choice to evaporate even complex
sample mixtures automatically is the EasyVac mode,
implemented in the Vacuum Controller V-855. The
EasyVac algorithm is based on relative pressure
changes over time and therefore requires no additional
accessory for operation.
It is possible to interrupt the algorithm at any time by
pressing the P
↑ button b and resuming the automatic
process by pressing the H Off button a. This is a very
helpful measure to reduce foaming and splashing for
delicate mixtures.
Fig. 6.35: Automatic distillation
NOTE
A tight system, i.e.
∆ p < 5 mbar per minute, is an essential prerequisite for the proper operation of
EasyVac.
6 .6 Optimizing the distillation conditions
Depending on the distilled solvent optimization of the parameters during the process is sometimes
required. An optimal loading of the condenser is approx. ½ of its height.
To achieve this either
• reduce the pressure or
• increase the temperature
Fig. 6.36: Optimal loading of the condenser
NOTE
In case of a temperature rise only a fraction of the additional energy is used for distillation. The
majority is discharged into the environment due to the increasing temperature difference of the
½