KD Scientific Centrifan PE - Manual (Page 13)

Introduction
Centrifan TM PE Personal Evaporator 1-3
Figure 1-3: Evaporation Path in Green; Condensation Path in Black
There are two gas flows in the system:
a) A primary or evaporation high flow path of recirculating gas removes solvent
molecules from the liquid surface of the samples, which are contained in a rotor
(right, yellow pathway of Figure 1-3).
b) A secondary or condensation low flow loop continuously transfers gas with the
solvent vapor to a cold trap for condensation and collection. After the solvent is
removed, the gas is returned to the evaporation chamber (left, green pathway of
Figure 1-3).
A heater in the lid maintains the desired gas temperature (the evaporation of solvent will
cool the sample to below ambient unless thermal energy is added). If desired, the user
can bleed in an inert gas such as Ar or N
2
to displace the air in the captured gas volume
and protect samples from oxygen degradation.
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