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Separation of Liquid Air Into Oxygen And Nitrogen By Air Separation Column
Chilled, Oil free and moisture free air enters into multi-pass HEAT EXCHANGER NO.I where it gets cooled to (-80) degC by cold gained from outgoing waste Nitrogen and Oxygen. A part of air this enters a multi-pass HEAT EXCHANGER NO. II or LIQUIFIER made of special Alloy tubes. This air cools to (-170) degC before passing through an expansion valve. Due to joule Thompson Effect, after the expansion valve. Due to joule Thompson Effect, after the expansion valve, air gets further cooled down and gets liquified before entering into bottom column is known as rich liquid.
The rich liquid in the bottom column enters into feed tray of top column enters into feed tray of top column. Similarly the liquid nitrogen called POOR LIQUID enters into top column as a reflux & it takes away the latest heat of condensing Oxygen and gets vapourised whereas the liquid Oxygen flows down the trays of the top column into the Condenser passes through a Sub-Cooler to a LO Pump.
 Air Separation Column Under Fabrication
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