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Reaction Engineering Test 1 + Memorandum

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This is test 1 (2021) + memorandum for Chemical Reaction Engineering

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  • March 16, 2023
  • 6
  • 2022/2023
  • Exam (elaborations)
  • Questions & answers
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DEPARTMENT OF CHEMICAL ENGINEERING




INSTRUCTIONAL PROGRAMME: BENG TECH CHEM ENG

INSTRUCTIONAL OFFERING : REACTION ENGINEERING

PAPER NUMBER : TEST 1

SUBJECT CODE : RCNE101

DATE : 06 MAY 2021

DURATION : 90 MINUTES

TOTAL MARKS : 60

NUMBER OF PAGES :4

EXAMINER/S : DR T.P MAHLANGU

MODERATOR : MR N BRIJMOHAN



INSTRUCTION/ REQUIREMENTS

1. ANSWER ALL QUESTIONS
2. WRITE YOUR NAME AND STUDENT NUMBER ON ANSWERSHEETS
3. MARKS WILL BE DEDUCTED FOR UNTIDY AND ILLEGIBLE ANSWERS




1

, QUESTION ONE

X 0 0.1 0.2 0.4 0.6 0.75 0.9
-rA
0.5 0.42 0.38 0.15 0.109 0.082 0.04
(mol/m3.s)


A reaction A  B + C is carried out in a CSTR where pure A enters at 8 mol/min. Using the reaction
data in the table above,

a) Calculate the volume required to reach 85% conversion of A.
b) Graphically display the area required to achieve a conversion of 85%.
c) If the same reaction was carried out in a PFR, what would the volume be for a conversion of
60%?

15 marks



QUESTION TWO

The rate constant for a second-order reaction at 85 degrees Celsius is 2.5 and the activation energy
is 20 KJ/mole. What are the units of the rate constant? At what temperature would the rate be triple
(of the rate at 85 degrees Celsius) for this reaction?

12 marks




QUESTION THREE



A gas phase reaction

2A + B ---> C + D

takes place in a PFR at a constant pressure of 25 atm and temperature of 350 K. The feed at a flow
rate of 5 dm3/min is 20% A and 80% B. Determine the PFR volume. The reaction is irreversible and
follows an elementary rate law. X = 0.9 and the rate constant is k = 8 dm6/mol2.s. Vo = 5dm3.

a) Construct a stoichiometric table.

b) Determine the volume required to reach the above-mentioned conversion.

c) Calculate the time it takes to reach the conversion.

33 Marks




2

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