Recycle Mass Balances: Screencasts
A chemical reactor system is fed 100. kmol/h of reactant A, which is then mixed with a recycle stream. In the reactor, 60.% of A that enters the reactor is converted to product B. The mixture exiting the reactor goes to a separation unit where all of product B plus 20.% of A is removed, and the rest of A is recycled and mixed with the fresh feed. How many kmol/h of reactant A enter into the reactor?
We suggest that after watching this screencast, you list the important points as a way to increase retention.
Explains the steps in crystallization that includes an evaporator, a crystallizer and filter, and a recycle stream.
We suggest that after watching this screencast, you list the important points as a way to increase retention.
Important Equations:
\[R = \frac{F_{T,R}}{F_f}\]
where \(R\) = recycle ratio,
\(F_{T,R}\) = total molar flowrate (or mass flowrate) in recycle stream, and
\(F_f\) = total molar flowrate (or mass flowrate) of fresh feed to system.
Overall conversion for a process with recycle
\[overall \, conversion \, = \frac{F_{A0} -F_{A,f}}{F_{A0}}\]
where \(F_{A0}\) = molar flowrate of reactant \(A\) into process (fresh feed, mol/h), and
\(F_{A,f}\) = molar flowrate of reactant \(A\) out of process (mol/h)
Conversion in reactor (single-pass conversion)
\[reactor \, conversion \, = \frac{F_{A,m} – F_{A,outlet}}{F_{A,m}}\]
where \(F_{A,m}\) = molar flowrate of reactant \(A\) in stream obtained by mixing fresh feed with recycle stream (mol/h), and
\(F_{A,outlet}\) = molar flowrate of reactant \(A\) in stream leaving reactor (mol/h).