The following elementary reactions are to be carried out in a PFR with a heat exchange with constant Ta:
2A+B→CΔHRx1B=−10kJmol BA→DΔHRx2A=+10kJmol AB+2C→EΔHRx3C=−20kJmol C The reactants all enter at 400 K. Only A and B enter the reactor. The entering concentration of A and B are 3 molar and 1 molar at a volumetric flow rate of 10 dm³/s.
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Ua=100J/dm3/S/KCPA=10J/mol/KK1A(400 K)=1.0(dm3mol)2/SCPB-20J/mol/Kk2A(400 K)=1.333S-1CPC-40J/mol/KK3B(400 K)=2(dm3mol)2/SCPD=20J/mol/KC PE=100J/mol/K What constant coolant temperature, Ta, is necessary such that at the reactor entrance, that is, V = 0, dTdV=0?