Revised Application technology solvent recovery

Solvent recovery and waste gas purification

When absorption and other technologies fall short of the requirement



During production of chemicals or pharmaceutical agents, solvent-containing exhaust gases often escape from the reaction vessels. The displacement air from petrochemical tank farms often contains gasoline fumes, and HCFCs (Hydrochlorofluorocarbons) are released in the recycling of refrigerators.

In the exhaust gas streams can be found Dichloromethane (methylene chloride), chlorobenzene, diethyl ether, chloroform, acetone, silicon compounds (siloxanes), alcohols, pentane and gasoline vapors, HFCs, CFCs and others. Gaseous substances such as Methyl chloride (chloromethane) or (CFC) R12 can also be recovered.

If these exhaust gas streams are passed through cooled heat exchangers, the vaporous substances liquefy in them. These can then be easily separated from the gas stream and returned to the tank or reused in production.


If the heat exchangers are cooled with liquid nitrogen, the process is referred to as "cryocondensation". Because of the extremely low cooling temperatures (-196 ° C), very high recovery rates are achieved, and efficient cleaning of the exhaust gas streams.


  • Exhaust air purification with simultaneous recovery of the solvents
  • Cost savings through recycling of the solvents
  • Compliance with the emission limit values (TA-Luft)
  • Double use of nitrogen: The nitrogen used for cooling can be used as a gas for inerting.
  • Pilot plants for customer trials
  • Individual plant design
  • Experience from over 80 installations worldwide


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Solvent recovery in pictures

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Refrigerator recycling

Protecting the environment through freons, CFCs recovery

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