Rotary Evaporation

The basic principle of rotary evaporation is that increasing a sample’s surface area and optimising 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. 

Rotary evaporation is a gentle and efficient method for liquid separation and purification. Specific rotary evaporation applications include: 


  • Concentration of solutions and suspensions 
  • Crystallisation or recrystallisation
  • 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 vapours 
  • 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