In the feed section of the maleic anhydride process shown in Figure B.5.1, consider that the air flowrate must be regulated so that a desired ratio between benzene and air is maintained. However, as the air flow changes, the discharge pressure of C-601 should also be maintained at a desired set point. Devise a control scheme to achieve the desired regulation. What type of control system did you design? Why?

Figure B.5.1

Transcribed Image Text:

V-601 C-601 Benzene Feed Drum Inlet Air Compressor Air Dibutyl Phthalate Make-up Benzene C-601 P-601A/B E-601 H-601 P-602 A/B Benzene Benzene Feed Molten Feed Feed Heater Salt Circ. Pumps Pumps Vaporizer V-601 Ips E-601 P-601 A/B Temperature, °C 116 E-602 hps bfw P-603 A/B E-602 R-601 P-603A/B E-603 T-601 Molten Reactor Dibutyl Reactor MA Salt Cooler Products of Combustion H-601 air ng P-602 A/B hps E-604 V-602 P-604 A/B E-605 MA Tower MA MA MA Makeup Effluent Scrubber Condenser Reflux Reflux Reboiler Pumps Cooler Drum Pumps R-601 E-605 bfw T-601 hps E-603 T-602 E-606 Dibutyl Dibutyl Scrubber Tower CW/ E-604 LIK Condenser Drum Pumps X-DLIC) V-602 P-604 A/B T-602 V-603 P-605 A/B Dibutyl Dibutyl Reflux Reflux E-607 E-606 CW/ FIC (V-603 P-605A/B P-606 A/B E-607 P-606 A/B Dibutyl Dibutyl Reboiler Recycle Pumps Off-Gas to Incinerator. To Maleic Anhydride Purification