14 Sep

Rotary Evaporators

Rotary Evaporators are an invaluable tool for the removal of moisture from various compounds.  They are ideal for the drying of powders and the recycling of chemicals and solvents.  The process is designed to evaporate samples under reduced pressure.  In order to achieve this result, the majority of the units manufactured are programable for heat, cold and timing.   Components used in the process are:

  • Motor for rotating the flask or vial
  • Vapor Duct
  • Vacuum System
  • Heated Fluid Bath
  • Condenser
  • Condensate-collecting flask and a mechanism to lift the evaporation flask from the heating bath.

The devise is designed to slowly rotate the flask or vial of the users sample and utilizing a vacuum-tight conduit for the vapor being drawn off of the sample.  The process can be as simple as using a water aspirator with a trap immersed in a cold bath, which is typically used for non-toxic solvents.  A more involved process might include a regulated mechanical vacuum pump with a refrigerated trap.

A common use for a rotary evaporator would be molecular cooking, which is the preparation of distillates and extracts.  Accessories used in the process would include Distillation glassware.   StephenG