Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1997-07-30
1998-09-01
Capossela, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62910, F25J 100
Patent
active
057995109
ABSTRACT:
An apparatus and method involving the use of a multi-column system in which higher and lower pressure columns are operatively associated with one another by a condenser-reboiler. A pump is provided for pumping a stream of sump liquid of the lower pressure column to produce a pressurized product. The condenser-reboiler is a falling film type of heat exchanger in which liquid is vaporized to produce boilup in the lower pressure column against vaporizing tower overhead in the higher pressure column to reflux both of the columns. Liquid is recirculated back to the condenser-reboiler by an ejector that uses part of a pumped stream as the motive fluid to draw liquid for recirculation. In such manner, less energy is consumed in the recirculation than had all of the recirculated liquid been pumped. Furthermore, an ejector, unlike a second pump used for recirculation purposes, is a solid state device with no moving parts.
REFERENCES:
patent: 3236059 (1966-02-01), Berstein
patent: 4091633 (1978-05-01), Linde
patent: 4325719 (1982-04-01), Yamazaki
Capossela Ronald C.
Pace Salvatore P.
Rosenblum David M.
The BOC Group Inc.
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