Rotary Evaporation

Rotary evaporation is a gentle and efficient method for liquid separation and purification. The basic principle of rotary evaporation is that increasing a sample’s surface area and optimizing its temperature and vacuum level enables a solvent to be effectively separated in as little time as possible. Additionally, a cooling condenser (either dry-ice or recirculating) will enable the recovery of the separated solvent.

Specific rotary evaporation applications include:


  • Concentration of solutions and suspensions
  • Crystallization or recrystallization
  • Solvent distillation and recycling
  • Chemical synthesis  

Two separate pieces of equipment are at the heart of a rotary evaporation system – a rotary evaporator and a vacuum pump.  



 Considerations for selecting the optimal vacuum pump include:


  • Oil-free operation with excellent chemical compatibility
  • Ability to process wet vapors
  • Ultimate depth of vacuum
  • Flow rate in proportion to the system volume
  • Solvent recovery options at both the inlet and the outlet 
  • Adjustable control of vacuum levels



Contact us to discuss KNF pumps and your unique application with one of our technical experts.  

Lab Products & Applications