Refrigeration – Processes – Circulating external gas
Patent
1989-12-04
1992-04-21
Capossella, Ronald C.
Refrigeration
Processes
Circulating external gas
62 24, F25J 300
Patent
active
051063980
ABSTRACT:
In order to provide `ultra high purity` nitrogen having diminished concentrations of light and heavy impurities in comparison with nitrogen produced by conventional cryogenic air separation, the nitrogen product from a conventional cryogenic air separation column is introduced into the bottom of a liquid-vapor contract column 2 fitted with a condenser 8 to provide reflux. A liquid nitrogen stream having a reduced concentration of heavy impurities is withdrawn from the column 2 through an outlet 22 situated at a level a few trays below the top tray in the column 2. The liquid nitrogen is then subjected to two stages of flash separation. In the first stage the liquid is passed through valve 24 into a phase separator 26. In the second stage, the resulting liquid from the first stage, having a reduced concentration of light impurities, is passed through valve 32 into a phase separator 34. Liquid nitrogen product is withdrawn from the phase separator 34 through outlet 38.
REFERENCES:
patent: 3010286 (1961-11-01), Baker et al.
patent: 4588427 (1986-05-01), Yao et al.
patent: 4636334 (1987-01-01), Skinner et al.
patent: 4765814 (1988-08-01), Bauer et al.
patent: 4867772 (1989-09-01), Eyre
patent: 4957523 (1990-09-01), Zarate et al.
Dunn Graeme J.
Kamrath David J.
Mostello Robert A.
Oakey John D.
Owen Robert
Capossella Ronald C.
Nemetz Carol A.
Pearlman Robert I.
Rosenblum David M.
The BOC Group plc
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