UW-Madison CHE 430 - ChE 430 Exam 3 (4 pages)

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ChE 430 Exam 3



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ChE 430 Exam 3

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Pages:
4
School:
University of Wisconsin, Madison
Course:
Che 430 - Chemical Kinetics and Reactor Design
Chemical Kinetics and Reactor Design Documents

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ChE 430 Exam 3 Thursday April 25 2002 NAME Instructions Parts I and II of the exam are closed book and notes You may use anything you have on your laptops for both Part I and Part II Remove your wireless network card during the exam Part I does not require any numerical calculation using the laptop Part I is worth 50 points and part II is worth 50 points Write all answers on separate paper Do not write any answers on the exam itself Hand in your exam as well as your solution at the end Make sure your name is on your solution and your exam Part I Problem 1 PFR Energy Balance 25 pts The first order reaction A B is carried out in a tubular reactor Costs dictate that we must reach 90 conversion for this process to be feasible We would like to operate the reactor adiabatically but product B degrades if the reactor temperature exceeds 500 K a Is it possible to operate the reactor adiabatically with this constraint i e what is the outlet temperature The inlet flow is pure A inlet temperature is 300 K inlet pressure is 10 atm NA0 2 kmol hr MA 50 kg kmol C p 3 09 kJ kg K HR 41 900 kJ kmol Ea 37 700 kJ kmol and k0 3 27 106 1 hr Values of the gas constant include R 8 314 J mol K and R 82 06 atm cm3 mol K b If adiabatic operation is not possible assume we have a heating cooling system available to help us reach the desired conversion We now will use two reactors in series operating the first adiabatically to 500 K and the second isothermally in order to obtain the desired conversion What is the outlet conversion from the adiabatic reactor and what are the reactor volumes required for each reactor Note If finding the reactor volume requires a numerical solution set up but do not solve the equations that are needed to obtain the reactor volume How much heat must be added or removed from the isothermal reactor 1 ChE 430 Exam 3 Thursday April 25 2002 Problem 2 CSTR Energy Balance 25 pts The liquid phase reactions A B A C are each first order in the concentration of A The feed to a



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