Chemical Engineering problem.
The fresh feed to an ammonia synthesis plant contains 24.30% N 2 , 75.20% H 2 and 0.50%
Ar. The reaction in the reactor is not complete so that recycle is necessary. In a specific
operation, the fresh feed is mixed with recycled gases and the mixture is sent to the reactor.
The gases leaving the reactor are sent to a cooler-condenser from which pure liquid
ammonia is obtained. The gas stream from the cooler-condenser also includes some
ammonia in gaseous form, and is recycled to the reactor. The unlimited accumulation of
argon in the system is prevented by incorporating a purge stream into the recycle line. Some
additional, partial information about some of the process streams is given below:
Reactor Feed â Ammonia 26.56%
Purge â Nitrogen 9.79%, ammonia 31.27%
Calculate, on the basis of 100 moles of fresh feed
a) The moles of purge, liquid ammonia product and the recycle streams and the
composition of the purge stream.
b) The reactor and overall conversion amounts â both based on the limiting reactant.
c) The overall plant yield, expressed as the percentage of total reactants in the fresh
feed that is converted to product.
Chemical Engineering problem.
The fresh feed to an ammonia synthesis plant contains 24.30% N 2 , 75.20% H 2 and 0.50%
Ar. The reaction in the reactor is not complete so that recycle is necessary. In a specific
operation, the fresh feed is mixed with recycled gases and the mixture is sent to the reactor.
The gases leaving the reactor are sent to a cooler-condenser from which pure liquid
ammonia is obtained. The gas stream from the cooler-condenser also includes some
ammonia in gaseous form, and is recycled to the reactor. The unlimited accumulation of
argon in the system is prevented by incorporating a purge stream into the recycle line. Some
additional, partial information about some of the process streams is given below:
Reactor Feed â Ammonia 26.56%
Purge â Nitrogen 9.79%, ammonia 31.27%
Calculate, on the basis of 100 moles of fresh feed
a) The moles of purge, liquid ammonia product and the recycle streams and the
composition of the purge stream.
b) The reactor and overall conversion amounts â both based on the limiting reactant.
c) The overall plant yield, expressed as the percentage of total reactants in the fresh
feed that is converted to product.
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