| 摘要 |
rectifying a major portion of an air feed in a column at 35-145 psia pressure to form N2-rich vapour and O2-rich liq.; condensing a minor portion of the feed air at a pressure above the column pressure by indirect heat with the O2-rich.; feeding the condensate to the column at least one tray above the major air feed level; condensing part of the N2-rich vapour by indirect heat exchange with vapourising O2-rich liq.; supplying at least part of the resulting condensate to the column at least one tray above the minor air portion level; and recovering the rest of the N2-rich vapour as prod..
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