The reactor operates with an incoming RF flowrate of 20,500 lbmol/hr. There is a 50% excess air in stream A with respect to Reaction 1. RF is can have no more than 5 mol% inert gas (G), with the balance C2H4, while stream A has mole fractions of 0.79 N2 and 0.21 O2. Stream F has 0.5% inert gas. The reactor operates with a selectivity of 3 for C2H4O vs CO2. Also, the yield across the reactor of C2H4O is 65%. The distillation column separates the reactor effluent, stream D, into stream P, which has 100% of the desired product C2H4O and the inert gas, stream W, which has 100% of the water, and the other components, which are all separated to stream T. Stream T is perfectly separated into stream R, which contains all of the unreacted ethylene and the inert gas, and the off gas (stream O), which has 100% of the unreacted oxygen, the nitrogen, and the carbon dioxide. (a) Determine the product molar flowrate P. (b) Determine fresh feed molar flowrate F. (c) Determine the off gas molar flowrate O. (d) What is the required purge/recycle ratio in order to avoid buildup of the inert gas?
The reactor operates with an incoming RF flowrate of 20,500 lbmol/hr. There is a 50% excess
air in stream A with respect to Reaction 1. RF is can have no more than 5 mol% inert gas (G),
with the balance C2H4, while stream A has mole fractions of 0.79 N2 and 0.21 O2. Stream F has
0.5% inert gas. The reactor operates with a selectivity of 3 for C2H4O vs CO2. Also, the yield
across the reactor of C2H4O is 65%. The distillation column separates the reactor effluent,
stream D, into stream P, which has 100% of the desired product C2H4O and the inert gas, stream
W, which has 100% of the water, and the other components, which are all separated to stream T.
Stream T is perfectly separated into stream R, which contains all of the unreacted ethylene and
the inert gas, and the off gas (stream O), which has 100% of the unreacted oxygen, the nitrogen,
and the carbon dioxide.
(a) Determine the product molar flowrate P.
(b) Determine fresh feed molar flowrate F.
(c) Determine the off gas molar flowrate O.
(d) What is the required purge/recycle ratio in order to avoid buildup of the inert gas?
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