5. In a reactive system with recycle, impurities keep accumulating over a period of time. Yourboss asked you to evaluate the following two options to handle this issue- purge a portion ofthe recycle stream, or separate the impurities from the feed before it is sent to the reactor.Cite at least two reasons that would favor your decision to go for option one. Ditto for optiontwo.6. Draw a section of a P&ID where a positive displacement pump is used to send a viscous oilfrom a vessel to a filter to remove suspended solids in the oil. The flow of the oil to the filteris controlled using a control valve. In addition, the discharge pressure of the pump iscontrolled by using a control valve that circulates a portion of the fluid from pump dischargeto suction as needed. You do not need to show the filter, but just show the section of theP&ID between the vessel and the pump discharge including the control systems mentionedabove. 1. You have been recently hired by a large Engineering & Construction company. The companyhas already prepared the following three principal diagrams; block flow, process flow, andpiping and instrumentation diagrams (P&ID). Upon review, you came across a number ofissues listed below. Explain what changes, if any, would have to be made to the threeprincipal diagrams.a. The reactor outlet temperature has been incorrectly specified.b. The steam requirement for a heater was calculated incorrectly and is now 20% lower thanbefore.c. Several globe valves have been added to the plant to facilitate manual control in case ofissues with the control valves.d. There is a change in the control strategy for a distillation tower bottom level. It has beendecided that the level of the distillation tower will be controlled by regulating an existingcontrol valve at the feed line to the tower rather than the tower bottom outlet flowrate.e. A heat exchanger has been eliminated.2. What type of drawing is needed for showing:(a) pipe in 3-dimensions?(b) the distance of a distillation tower bottom from the ground?(c) the distance between a reactor and a distillation tower?3. Gas at a high temperature exceeding 500°C is flowing through a pipe. You are evaluating theoption of a high temperature resistant steel without any refractory lining vs a refractory-linedmaterial of construction that can only withstand low temperature. Cite at least twodisadvantages of each of the options.4. Adding an inert to the reactor feed can have several disadvantages. List at least fourdisadvantages of adding an inert to the feed.

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