Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1997-08-22
1998-09-01
Capossela, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62641, 62909, F25J 100
Patent
active
057995095
ABSTRACT:
An apparatus and method for recovering one or more components from the vapor feed in which the component is recovered from the vapor feed at a lower pressure within a lower pressure cold trap. Thereafter, a higher pressure cold trap is connected to the lower pressure cold trap and the component revaporizes in the lower pressure cold trap and resolidifies in the higher pressure cold trap. The higher pressure cold trap is then isolated and the component is allowed to thaw to build up a vapor pressure such that the component can be delivered for recovery at a high pressure. Two or more components having higher and lower boiling points can be recovered by low pressure cold traps set in series. Low pressure cold traps can be provided to operate in an out of phase relationship so that components are frozen on one set of lower pressure cold traps while being vaporized from the other set of cold traps. In the case of two component recovery, two high pressure cold traps are provided to allow two components to vaporize and thus develop a sufficient vapor pressure to be delivered at the requisite delivery pressure.
REFERENCES:
patent: 5345771 (1994-09-01), Dinsmore
patent: 5398513 (1995-03-01), Klobucar
patent: 5533338 (1996-07-01), Lee et al.
Athalye Atul M.
Finley Steven J.
Sadkowski Piotr J.
Capossela Ronald C.
Pace Salvatore P.
Rosenblum David M.
The BOC Group Inc.
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