b) Figure 1 is a reactive distillation column (RDC) unit for a chemical process plant. The reactant E and F enter the reactive section, having reversible exothermic reaction producing distillate product, G and bottom product, H. Vapor product at the top of RDC is cooled by a condenser (C-1), and the subsequent liquid is hold up in a reflux drum (D- 1). Outlet stream from D-1 is separated into reflux and distillate product (G). At the bottom of RDC, the liquid outlet is channeled into reboiler stream (R-1) and bottom product stream (H). The liquid that goes into the reboiler (R-1), exchange heat with steam and some of the liquid change phase to vapor. In order to optimize the process, the following parameters need to be controlled: The composition of bottom product, H The level of reflux drum State the control and manipulated variables for both parameters that need to be controlled. Based on the feedback control strategy, sketch the control loops according to the Process and Instrumentation Diagram (P&ID). (10 marks) C-1 D-1 Distillate product, Reactant, E Reflux Reactant, F Reactive section R-1 Steam Bottom product, H Figure 1 Reactive distillation column (RDC) unit