| 摘要 |
A method of fractionation of air which includes the steps of feeding material air compressed by a withdrawing liquefied oxygen from the bottom of a crude argon column, pressurized under its own weight, and gasifying the liquefied oxygen by a reversible heat exchanger to provide an oxygen product while withdrawing an argon-rich gas at the top of the crude argon column by means of a blower so as to maintain the internal pressure of the crude argon column at a reduced pressure.
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