For the benzene column (T-101) in Figure 1.5, do the following:

1. Implement a control scheme that will regulate the purity of the benzene product (Stream 15). You may assume that the purity of this stream can be evaluated by an on-line refractive index monitor placed on Stream 15.

2. What is the type of control system that you have designed in Part (a) called?

Figure 1.5

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V-101 Toluene Feed Drum Toluene KEY Temperature (°C) Pressure (bar) Mass Flow (1000 kg/h) Hydrogen 3 10.0 25 1.9 P-101A/B Toluene Feed Pumps 0.82 25 25.5 E-101 Feed Preheater LV-101 P-101A/B H-101 Heater R-101 Reactor 225 25.2 hps E-101 4 Air C-101A/B Recycle Gas Compressor Combustion Products 5 600 25 fg H-101 6 654 24 E-102 Reactor Effluent Cooler R-101 V-102 High-Pres. Phase Sep. /25.5 C-101A/B 9 V-103 High-Pres. Phas e Sep. E-102 <8) 380 239 V-102 E-10 3 Feed Preheater Reboiler V-103 E-106 T-101 E-104 Benzene Benzene Benzene Column Condenser 18 E-103 Ips mps E-106 T-101 E-104 3.3 CW 112 V-104 P-102A/B V-104 Reflux Drum 7 P-102A/B Reflux Pump CW E-105 E-105 Product Cooler Date Date Date Revision +0 Fuel Gas Benzene TBWS Designs - Toluene HDA Process Drawn by Checked by Approved by Drawing No.