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AssigneeAir Products and Chemicals, Inc.
InventorsJean-Philippe Trembley, John Louis Griffiths
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Volatile compounds (“VCs”), especially volatile organic compounds (“VOCs”), are cryogenically removed from a process gas stream (PW) by cooling the gas stream in a condenser to condense the VC to form both liquid VC and VC ice and providing a treated process gas essentially freed of the VC but containing entrained VC ice particles, which are subsequently removed by passing the treated process gas through a filter downstream of the condenser to remove at least particles of a size greater than 50 μm. The condensation can be conducted in an indirect heat exchanger or by direct contact of the process gas with a liquid cryogen such as liquid nitrogen. It is preferred that the filter removes VC ice particles greater than 1 μm.
In a cryogenic process for the removal of a volatile compound (“VC”) from a process gas stream comprising cooling the gas stream in a condenser to condense the VC to form both liquid VC and VC ice and provide a treated process gas which is essentially freed of the VC but contains entrained VC ice particles, the improvement consisting of passing said treated process gas through a filter downstream of the condenser to remove at least said entrained VC ice particles which are of a size greater than about 50 μm.
In a cryogenic process for the removal of VC from a process gas stream comprising cooling the gas stream within a condenser to condense the VC to form VC ice and provide a treated process gas which is essentially freed of the VC but contains entrained VC ice particles, the improvement consisting of cooling the gas stream in a vortex of liquid cryogen and passing the treated process gas through a filter downstream of the condenser to remove at least said entrained VC ice particles which are of a size greater than about 50 μm.
The process according to claim 22, wherein the filter comprises sintered porous metal or ceramic.
Dependencies are inferred from the claim text.