Vacuum Evaporation Overview

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Vacuum Evaporation Overview

Vacuum concentrators use a combination of heat, vacuum and centrifugal force for the evaporation of volatile samples. The method is used for evaporation, drying, purification and especially fast concentration. It takes advantage of the fact at pressures of a few hectopascal, volatile substances boil at room temperature without freezing the specimen. 

The additional centrifugal force from rotation prevents bumping and changes the liquid level in the test tubes, thereby increasing the evaporation surface. The applied heat increases the rate of evaporation without causing overheating of the specimens under vacuum. Rotational Vacuum Concentrators (RVC) are an alternative to the following methods:

Rotational vacuum concentration occupies a position between the two methods mentioned above. With suitable parameter settings, the resulting products can also be frozen and sublimated in a sort of final-drying process.

The boiling point for liquid evaporation depends on the nature of the substance concerned and the external pressure. Reducing the pressure dramatically reduces the boiling point of the solvent and therefore avoids overheating of samples.


Key features of rotational vacuum concentration:

 
Applications overview

1.Analytical applications
Application / Industry Application Substances
Toxicology / Forensic / Medicine Residue analysis Amphetamines, narcotics, drugs, antibiotics, alcohols, other chemicals
Environment

Residue analysis:

  • Water
  • Wastewater
  • Soil & sediment
Polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), dioxins
Foods and agriculture
  • Residue analysis
  • Quality control
  • Purity control
End product, HPLC fractions, aromas
Biotechnology & pharmaceuticals Specimen preparation & concentration: before or after HPLC Acetonitril, ethanol, methanol, water

Media

Taxonomy

1 Comment

  1. Could this system be applied to concentrate water from the reverse osmosis concentrates and wash water from the ion exchange columns?
    These currents are a big problem because they have a high electrical conductivity and there is almost no technology at low cost that justifies their treatment.
    Thank you very much.

    1 Comment reply

    1. Hi Marcelo, Thank you for your comment.  Yes. The evaporation system can be used for concentration of RO waste.  High electrical conductivity is not a problem normally while using evaporator system. Because we processed many wastewaters with mainly NaCl composite. NaCl solution is high electrical conductivity water.  For a professional opinion for you, can you please let me know more detailed data of water from RO system? You can email me: ms.dong@nomiamachinery.com.