Air separation unit and method for production of nitrogen and argon using a distillation column system with an intermediate pressure kettle column

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United States of America Patent

PATENT NO 12055345
APP PUB NO 20240035744A1
SERIAL NO

17875616

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Abstract

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An air separation unit and associated method for separating air by cryogenic distillation using a distillation column system including a higher pressure column, a lower pressure column, an intermediate pressure kettle column, and an argon column arrangement is provided. The disclosed air separation unit and method is particularly suited for production of an argon product as well as several nitrogen products wherein a portion of the nitrogen overhead intermediate pressure kettle column is taken as an intermediate or elevated pressure nitrogen product. The present air separation unit and associated method employs a once-through kettle column reboiler, a once-through kettle column condenser while the argon condenser condenses an argon-rich vapor stream against a pumped oxygen stream from the bottom of the lower pressure column.

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Patent Owner(s)

Patent OwnerAddress
PRAXAIR TECHNOLOGY INC10 RIVERVIEW DR DANBURY CT 06810

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Handley, James R East Amherst, US 25 171
Prosser, Neil M Lockport, US 51 203

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