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Question 2.14: In the production of ammonia from hydrogen and nitrogen the ...

In the production of ammonia from hydrogen and nitrogen the conversion, based on either raw material, is limited to 15 per cent. The ammonia produced is condensed from the reactor (converter) product stream and the unreacted material recycled. If the feed contains 0.2 per cent argon (from the nitrogen separation process), calculate the purge rate required to hold the argon in the recycle stream below 5.0 per cent. Percentages are by volume.

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Basis: 100 mols feed (purge rate will be expressed as mols per 100 mol feed, as the
production rate is not given).
Process diagram

Volume percentages are taken as equivalent to mol per cent.
Argon entering system with feed = 100 × 0.2/100 = 0.2 mol.
Let purge rate per 100 mol feed be F.
Argon leaving system in purge = F × 5/100 = 0.05F.
At the steady state, argon leaving = argon entering
0.05F = 0.2
F  =\frac{0.2}{0.05} =\underline{\underline{4} }
Purge required: 4 mol per 100 mol feed.

sou2.14

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