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In a reactive system with recycle, impurities keep accumulating over a period of time. Your boss asked you to evaluate the following two options to handle this issue- purge a portion of the recycle stream, or separate the impurities from the feed efore it is sent to the reactor. Cite at least two reasons that would favor your decision to go for option one. Ditto for option two.

In a reactive system with recycle, impurities keep accumulating over a period of time. Your boss asked you to evaluate the following two options to handle this issue- purge a portion of the recycle stream, or separate the impurities from the feed efore it is sent to the reactor. Cite at least two reasons that would favor your decision to go for option one. Ditto for option two.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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5. In a reactive system with recycle, impurities keep accumulating over a period of time. Your boss asked you to evaluate the following two options to handle this issue- purge a portion of the 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 option two. 6. Draw a section of a P&ID where a positive displacement pump is used to send a viscous oil from a vessel to a filter to remove suspended solids in the oil. The flow of the oil to the filter is controlled using a control valve. In addition, the discharge pressure of the pump is controlled by using a control valve that circulates a portion of the fluid from pump discharge to suction as needed. You do not need to show the filter, but just show the section of the P&ID between the vessel and the pump discharge including the control systems mentioned above.
Transcribed Image Text:5. In a reactive system with recycle, impurities keep accumulating over a period of time. Your boss asked you to evaluate the following two options to handle this issue- purge a portion of the 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 option two. 6. Draw a section of a P&ID where a positive displacement pump is used to send a viscous oil from a vessel to a filter to remove suspended solids in the oil. The flow of the oil to the filter is controlled using a control valve. In addition, the discharge pressure of the pump is controlled by using a control valve that circulates a portion of the fluid from pump discharge to suction as needed. You do not need to show the filter, but just show the section of the P&ID between the vessel and the pump discharge including the control systems mentioned above.
1. You have been recently hired by a large Engineering & Construction company. The company has already prepared the following three principal diagrams; block flow, process flow, and piping and instrumentation diagrams (P&ID). Upon review, you came across a number of issues listed below. Explain what changes, if any, would have to be made to the three principal 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 than before. c. Several globe valves have been added to the plant to facilitate manual control in case of issues with the control valves. d. There is a change in the control strategy for a distillation tower bottom level. It has been decided that the level of the distillation tower will be controlled by regulating an existing control 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 the option of a high temperature resistant steel without any refractory lining vs a refractory-lined material of construction that can only withstand low temperature. Cite at least two disadvantages of each of the options. 4. Adding an inert to the reactor feed can have several disadvantages. List at least four disadvantages of adding an inert to the feed.
Transcribed Image Text:1. You have been recently hired by a large Engineering & Construction company. The company has already prepared the following three principal diagrams; block flow, process flow, and piping and instrumentation diagrams (P&ID). Upon review, you came across a number of issues listed below. Explain what changes, if any, would have to be made to the three principal 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 than before. c. Several globe valves have been added to the plant to facilitate manual control in case of issues with the control valves. d. There is a change in the control strategy for a distillation tower bottom level. It has been decided that the level of the distillation tower will be controlled by regulating an existing control 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 the option of a high temperature resistant steel without any refractory lining vs a refractory-lined material of construction that can only withstand low temperature. Cite at least two disadvantages of each of the options. 4. Adding an inert to the reactor feed can have several disadvantages. List at least four disadvantages of adding an inert to the feed.
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