User guide

RVC 2-18 CD& HCL
2 Layout and mode of operation
14
Version 04/2012, Rev. 1.4 of 25/11/2013 • sb
Translation of the original operating manual
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2.2 Mode of operation
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2.2.1 Principle of the rotational vacuum concentration
This method is used for the particularly quick and gentle evaporation,
drying, purification, and concentration of samples.
Rotational vacuum concentration is an alternative to rotary evaporators that
use high temperatures and operate nearly at normal pressure. Because of
the vacuum, the sample boils at low temperatures, and water as well as
organic solvents can be evaporated in a particularly gentle manner. Due to
the fact that the sample rotates like in a centrifuge, the  Boiling retardation
is prevented so efficiently that low pressure can be used. As a result,
temperature-sensitive samples can be concentrated by evaporation without
being damaged.
The solvent can be collected in a cooling trap and disposed of immediately
if desired.
Fig. 3: Vapour pressure curve for ice and water