> 03000CH308052002 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Sixth semester B.Tech degree examinations (S), September 2020

Course Code: CH308
Course Name: CHEMICAL REACTION ENGINEERING -II

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Describe pulse and step input and their responses with suitable figures (6)
b) Form the response data for a pulse input of a reactor given below: (9)

t, min

Cou, ‏الع‎ | 0 3 5 ೨ 4 2 1 0

(i) Calculate the mean residence time.
(ii) Tabulate and construct the E curve and also calculate the area under the E curve.

2 With a figure briefly explain the basics concepts of tank in series model and derive ‏لله‎ (15)
expression for the model parameter ‘number of tanks (n)’.

3 a) Calculate the mean conversion in a reactor for first order, liquid phase, irreversible (10)
reaction in a completely segregated fluid: A>Products.
The reaction rate constant is 0.1 min” at 320 K.

| min | min

| ا ا ما ‎பண்பான‏
‎ணை‏

b) Prove that for an ideal reactor the mean residence time is equal to the space time. (5)
PART ‏جا‎
‎Answer any two full questions, each carries 15 marks.
4+ a) With ೩ neat diagram list the various steps involved in a reaction occurring ina (5)

porous catalyst
b) Assume desorption step to be rate limiting and derive an expression for reaction (10)
rate for the overall reaction A+B > C. Steps of the reaction are given below:

Adsorption: A+S > AS and B+S > BS

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