Understanding the Filtration Process

In contrast to simple gravimetric filtration, a vacuum pump creates a pressure differential to more effectively draw the liquid through the filter.
 
The efficiency of vacuum filtration can be affected by a number of factors, including the porosity of the filter, the viscosity of the liquid being filtered, and the type of particle being removed. When selecting a vacuum pump, it is important to consider the volume of your flask and the number of filtration units or "funnels". A vacuum that is too weak will cause the process to take longer, while a vacuum that is too strong may cause the filter to tear or collapse.

Factors to Consider When Selecting the Ideal Pump for Filtration Processes

  • Flow rate proportional to flask volume and number of filtration units (funnels)
  • Oil-free operation with excellent chemical compatibility
  • Chemical resistance to solvents and acids
  • Adjustable flow control

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