Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1998-08-24
2000-07-11
Capossela, Ronald
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62 482, F25J 100
Patent
active
060855487
ABSTRACT:
A control vent system is disclosed for reducing volatile impurities in a gaseous product of ultra-high purity delivered from a storage vessel containing an inventory of a non-cryogenic liquid product, as well as a method and a system for delivering the product from the storage vessel. The control vent system includes a vent line attached to the storage vessel and a condenser in the vent line. Coolant (e.g., a refrigerant) is transferred between the condenser and a source of coolant, such as a refrigeration unit. The method of reducing volatile impurities includes three steps. The first step is to vent part of the gaseous vapor from the gaseous vapor space to a condenser. The second step is to cool the vented gaseous vapor in the condenser to a temperature below the boiling point of the liquid product and above the boiling points of the volatile impurities. As a result, a first portion of the vented gaseous vapor is condensed and a second portion of the vented gaseous vapor is not condensed. The final step is to vent the second portion of the vented gaseous vapor from the condenser.
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Chandra Sukla
Chowdhury Naser Mahmud
Coull Kenneth
Irven John
Taege Reiner Reinhard Wilhelm
Air Products and Chemicals Inc.
Capossela Ronald
Chase Geoffrey L.
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