BUCHI Rotavapo R-220 SE - Manual (Page 21)

4 Description of function
21 R-220 SE Operation Manual, Version F
4 Description of function
This chapter explains the basic working principle of the Rotavapor R-220 SE. It also shows how the
instrument is structured and provides a general functional description of its assemblies.
4 .1 Functional principle of a Rotavapor evaporation
The Rotavapor R-220 SE offers efficient, time saving single-stage distillations for small and medium
stage productional applications. The process is based on the evaporation and condensation of
solvents or drying of powders and pasty materials in a rotating evaporating flask .
Standard vacuum applications
Due to its sophisticated seal system a highly stable vacuum level can be reached in combination
with a vacuum controller and a vacuum pump. The vacuum also eliminates unwanted or hazardous
emissions of vapors during the process and serves as an important safety feature. The low pres-
sure decreases the boiling point of the medium inside the Rotavapor. This allows to treat the product
gently at even higher evaporation performance compared to environmental pressure operation.
Special applications
• In combination with the dry ice condenser (configuration ‘C’) distillations at lowest temperatures
can be achieved
• For the oxydation of sensitive products, the processing can take place under inert gas conditions