Reactor with recycle 1) Reactor with recycle A fresh feedstock of volume flow ra
ID: 1024454 • Letter: R
Question
Reactor with recycle
1) Reactor with recycle A fresh feedstock of volume flow rate of Vo and mole flow rate of A equal to FA0, liquid phase reaction has reaction rate rA. A effluent of volume flow rate of Vo and concentration of C The reactor was operating at the steady state as shown in Fig.A. At time to, the pump start to pump of effluent of volume flow rate of v nto feedstock as shown in Fig. B. R' Vo a) What is the steady state CA before/after recycling if the reactor is a CSTR b) What is the transient state of CA after recycling and before reach the final steady state with recycle, assuming rA kC C) What is the steady state CA before/after recycling if the reactor is a PFR assuming IA kC Vo, F Vo, C A0 Fig. a Vo A0 vo, C A Fig. bExplanation / Answer
given in a Reactor recycle,
A fresh feed stock of volume = V0,
Molar flow rate = FA0, where A is number of moles of inlet species.
a) the steady state CA before / after recycling if the reactor is a CSTR means Continuous Stirred Tank Reactor , is a common ideal reactor.
steady state is one of the assuming condition in Continuous Ideal stirres Tank ractors. steady state is a situation in which all state variables are constant in spite of ongoing process that strive to change them.
In-Out+ Production = Accumalation
FAO-FA+rAV0 = 0 (steady state)
for a liquid phase with constant P:
FAO = CAV0 (V0 is volumetric flow rate)
b) transient state means in a chemical reactor is being brought into operation, the concentrations, temperatures,moles, and reaction rates are changing with time until operation reaches its normal process variables.
rA=-kCA
c) PFR means plug flow reactor solution for which can be caluclated providing that appropriate boundary conditions known
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