Refrigeration – Processes – Circulating external gas
Patent
1987-11-17
1988-10-04
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 29, 62 38, F25J 304
Patent
active
047753994
ABSTRACT:
Method and apparatus for achieving high yields of high purity N.sub.2 and optional coproduct O.sub.2 at lower energy and capital cost than heretofore possible are disclosed. Referring to FIG. 1, in a dual pressure configuration comprised of a rectifier (105) and a column (102), warm companded air from a compressor (118) provides bottom reboil at the reboiler (103), and the liquid air is split to reflux both columns. The refrigeration expander (112), driven by expansion of waste O.sub.2, provides the power for the compressor (112). Also kettle liquid is distilled into two vapor streams by a contact zone (107) before feeding to the column (102).
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