Q2 Gaseous ammonia and 50 wt% aqueous nitric acid solution are fed to a reactor in stoichiometric proportions where they react completely to form...
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Q2
Gaseous ammonia and 50 wt% aqueous nitric acid solution are fed to a reactor in stoichiometric
proportions where they react completely to form aqueous ammonium nitrate:
NH3 + HNO3 ---> NH4NO:
The aqueous ammonium nitrate solution leaving the reactor is mixed with a recycle stream coming
from a crystalliser. The mixed stream passes through an evaporator where some of the water is
removed. The concentrated solution leaving the evaporator is saturated at 70'C and passes through
a crystalliser and filter unit which produce anhydrous NH.NO: crystals at 20*C. The saturated NH NO:
solution at 20'C leaving the crystalliser/filter is recycled to be mixed with reactor product stream.
The wet filter cake, containing 90 wt% NH,NO: crystals and the remaining saturated NH4NO: solution
at 20'C is sent to a dryer where all of water is removed.
For a production rate of 100.0 ton/day of anhydrous ammonium nitrate crystals, find -
(a) The mass flow rate of the recycle stream (kg/h).
(b) Mass flow rate of the water evaporated in the evaporator and the dryer (kg/h).
(c) If the water leaving the evaporator is condensed to be mixed with a concentrated nitric acid
solution to make the feed solution of 50 wt% nitric acid what would be the mass composition
of the concentrated nitric acid solution. Comment on why it is important to recycle the water
leaving the evaporator.
Data:
Solubility of NH NO; in water (g NH,NO:/100 g water)
Temperature ("C)
134.2
20
235.1
70

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