Air separation

Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture

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62924, F25J 300

Patent

active

058626808

ABSTRACT:
Air is separated in an arrangement of rectification columns comprising a double rectification column having a higher pressure column and a lower pressure rectification column, an intermediate pressure rectification column, and a side rectification column communicating with the lower pressure column. The side rectification column is provided with a condenser and the intermediate pressure rectification column with a reboiler and a further condenser. A stream of oxygen-enriched liquid is withdrawn from the bottom of the higher pressure column through an outlet and is separated in the intermediate pressure rectification column. The reboiler is heated by a stream typically withdrawn from the side rectification column through an outlet thereof. The condensers of the side rectification column and the intermediate column are cooled by streams having different oxygen mole fractions.

REFERENCES:
patent: 5341647 (1994-08-01), Koeberle et al.
patent: 5428962 (1995-07-01), Rieth
patent: 5471842 (1995-12-01), Mostello et al.

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