Process to produce moderate purity oxygen using a double column

Details Process to produce moderate purity oxygen using a double column Process to produce moderate purity oxygen using a double column

1996-08-06

1997-12-30

Capossel, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, 62939, F25J 300

Patent

active

057017646

ABSTRACT:
A process is set forth for the cryogenic distillation of an air feed to produce an oxygen product, particularly an oxygen product at moderate purity (80-99%, preferably 85-95%). The process uses an auxiliary low pressure column in addition to the conventional high pressure column and low pressure column. The auxiliary low pressure column, which is preferably operated at the same pressure as the main low pressure column and which is heat integrated with the top of the high pressure column by means of its bottom reboiler/condenser, pretreats the crude liquid oxygen from the bottom of the high pressure column. The resulting overhead vapor stream and bottom stream are subsequently fed to the main low pressure column. Preferably, the bottom stream is fed to the main low pressure column in a state which is at least partially vapor.

REFERENCES:
patent: 4410343 (1983-10-01), Ziemer
patent: 4702757 (1987-10-01), Kleinberg
patent: 5231837 (1993-08-01), Ha
patent: 5265429 (1993-11-01), Dray
patent: 5337570 (1994-08-01), Prosser
patent: 5456083 (1995-10-01), Hogg et al.
patent: 5546766 (1996-08-01), Higginbotham
patent: 5572874 (1996-11-01), Rathbone

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