Revised Application technology solvent recovery

DuoCondex - Solvent Recovery and Waste Gas Purification

When absorption and other technologies fall short of the requirement

Cryogenic VOC Recovery and Cryogenic Waste Gas Purification

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 by cryo condensation according to Messer`s DuoCondex process.

If these exhaust gas streams are passed through cooled cryogenic condenser, 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.

GAS APPLICATIONS

If cryogenic condenser are cooled by liquid nitrogen, the process is referred to as cryo condensation. Because of the extremely low cooling temperatures (-196 °C), very high recovery rates are achieved, and efficient cleaning of the exhaust gas streams.

Advantages of a DuoCondex cryo condensation system:

•   Cryogenic waste gas purification with simultaneous cryogenic VOC recovery
•   Cost savings through recycling of solvents
•   Compliance with national emission limit values
•   Double use of nitrogen: for cryogenic cooling and in gaseous form for inerting
•   Cryogenic condensation pilot plants for customer trials
•   Individual cryogenic condensation package unit design
•   Experience in more than 80 cryogenic VOC recovery and cryogenic waste gas purification installations worldwide

MESSER - Solution for cryogenic condensation

Cryo condensation systems according to the DuoCondex process are individually designed to customer requirements and optimally designed for each individual case. For trials, a mobile pilot plant is available which, together with the appropriate nitrogen supply, can easily be installed at the customer's premises (also in hazardous areas).

The operator has the possibility to determine temperatures or cooling capacities required for his process in practical operation without major investment costs. The results obtained then flow directly into the design for the configuration of a tailor-made cryogenic condensation system.