BUCHI Multivapo P-12 - Manual (Page 54)

6 Operation
54 Multivapor™ Operation Manual, Version E
heating plate and the ambient temperature.
6 .7 When the distillation “dies out”
When the distillation “dies out”, i.e. the process draws to a close, back evaporation may occur. In this
event appropriate actions are either to interrupt the distillation in order to empty the receiving flask or
to keep the solvent at a low temperature (see also section 6.5.2).
A convenient accessory for the latter is the refrigerated receiver.
The solvent can be disposed of by opening the top GL-14 tube connection and subsequently draining
the solvent into a beaker.
Fig. 6.37: Drainage of the cooled receiving flask
6 .8 At the end of a run
When the distillation is complete the system is aerated and the
rotation is stopped.
By the time the quick lock nut is opened, the retaining springs
(not shown in the picture) pull the vacuum cover and the tube
adapters apart, facilitating the opening of the cover. However,
the instrument can also be operated without the retaining
springs.
Put the vacuum cover to its holder and transfer the samples
back to the sample preparation rack. Thus, the time during
which the samples are exposed to a warm environment is
reduced.
If there is no intention to perform another distillation, turn off
the instrument and the coolant supply to save energy and
resources.
Fig. 6.38: Holder for the vacuum cover