EXAMPLE #3: RECYCLE TO EXTINCTION Reaction system:A→B BeC where b is the desired product C is in equilibrium with B, so that Cc/cb=Ke=0. 1 Goal: recycle enough c so that the amount fed to the reactor is the equilibrium amount, hence no net ∫ formation Specs: make 100 mohr of B at a conversion ofa of% if no make of C, must feed 100 mowhr of a and recycle 100 mo/hr of A. Reactor effluent is 100 moWhr A, 100 mowhr of B and 10 mo/hr of c at equilibrium So, we must recycle 10 mor of c along with 100 mowhrofA 11/29/99 Recycle structure11/29/99 Recycle Structure 7 EXAMPLE #3: RECYCLE TO EXTINCTION Reaction System: A Þ B B Û C where B is the desired product C is in equilibrium with B, so that Cc/ Cb = Ke = 0.1 Goal: recycle enough C so that the amount fed to the reactor is the equilibrium amount, hence no net formation. Specs: make 100 mol/hr of B at a conversion of A of 50%. If no make of C, must feed 100 mol/hr of A and recycle 100 mol/hr of A. Reactor effluent is 100 mol/hr A, 100 mol/hr of B and 10 mol/hr of C at equilibrium. So, we must recycle 10 mol/hr of C along with 100 mol/hr of A