In this exercise, you will evaluate the individual units at the nominal steady state for purposes of understanding how the plant would operate without recycle. Use Simulink to simulate the lull differential equation model given in Table 23,1. Then, for purposes of this problem only, ?tear? the recycle stream to the reactor, that is, disconnect the distillate line and replace it with a constant stream to the reactor that is set at the recycle stream?s nominal conditions of flow rate and concentration.

(a) Using a material balance control configuration and any of the techniques discussed in Chapters 12 or 14, find P or P1 controller settings that will regulate the liquid levels in the reboiler and the reflux drum with little overshoot.

(b) Complete the column control structure by finding PI controllers that will satisfactorily maintain the distillate and bottoms composition, again with little overshoot. Test your column level/composition control system by making small step changes in the column feed flow rate and composition.

(c) In a similar manner, develop a P or PI controller for reactor level using F as the manipulated variable. (Note that level controller settings obtained using F0 for the manipulated variable will be identical to those using F.) Again, test your reactor level control system by making small step changes in the feed flow rate and composition.

Resctor General information: Readion: A - B Reaction rate expression is first order in reactant A. Akatiat Keactor Modelt (-O lor pertect reactor level controf) d{lfac) Fate t Dra - + dt Colamn Geueral Infarmatien: Saturated liquid fend is ha 12 stage (af 201) naimbered from the top down Equimolal overflow is assumed. A is the more volatile composest; asnume equilibrium holds for cach stage. Columan Modet (-O or pertect level control) Reflax Drum: de d(Hoxn) - Vyn- Reo Dip H;- L(x-)+Vy. 1- for 13 5is 19 Stage / above feed: where LR H- (Lau- L'rua) Vns-a) Ft Feed stage: de where 1-L+F Stage Jhelow fed: dle- L-V-8 dr (-O for perfect redotier level control) Reboller: - L'x- Via + B