The concentration of oxygen inside a 5000 L tank at 1 atm is to reduced by...

The concentration of oxygen inside a 5000 L tank at 1 atm is to reduced by pressure purging prior to charging a fuel into the tank. The tank is charged with nitrogen up to a high pressure and then vented down to atmospheric pressure. If the process is repeated, the concentation of the oxygen will decrease. It is possible to do this many times in order to ultimately reach desired concentration. You can assume that a fully charge tank contains all nitrogen.

Speculate on why the tank is being purged.
Estimate the gauge pressure (atm) to which the tank must be charged if the purge is to be done in a one charge vent cycle. Then estimate the mass of nitrogen (kg) used in the process.
Suppose that nitrogen at 700 kPa (g) is used for the charging. Calculate the number of charge vent cycles required and the total mass of nitrogen used.
Explain why multiple cycles at lower gas pressure are preferable to a single cycle. What is a disadvantage of multiple cycles?

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genius_generous answered 1 year ago

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