... adsorption unit, where the contents of moisture, CO2, hydrocarbons in the air are being adsorbed. Molecular sieve adsorption unit is made up ... expansion turbine, all the rest enters the cold box for air separation. In the main heat exchanger, it is cooled by gas ... the top of the LP column, and thru reheating in the liquefied air / liquefied nitrogen subcooler and the main heat exchanger, it ...