Rotary evaporators are essential laboratory equipment for process of evaporation, concentration, drying, separation, and solvent recovery.  They are are mainly used for continuous distillation of large amounts of volatile solvents by reducing the pressure to lower the solvent boiling point, rotating the sample to increase the effective surface area and heating the solution in the bath. Then the evaporated solvent condenses in a cooled glass condenser. The evaporators are widely used in the research and process laboratories and also in biological, pharmaceutical, chemical and food & beverage industries.