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Posted By: Fortune Member Level: Diamond Posted Date: 04 Jun 2008
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2007 Anna University B.Tech Industrial BioTechnology IB332 - CHEMICAL REACTION ENGINEERING Question paper
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B.Tech. Industrial Biotechnology
(V Semester)
IB332 - CHEMICAL REACTION ENGINEERING
Max. Marks: 100 Time: 3 hours
PART – A (10 X 2 = 20 Marks)
1. For the elementary reversible reaction
2A D R + S
k2
Derive the relation between equilibrium constant Kc, k1 and k2.
2. The Constant volume reaction A à R + S (gas phase) is started with NAO moles. After time ‘t’ min the fractional conversion of A is xA. If the initial pressure is Po what will be the pressure at t. Temperature is constant.
3. For the parallel reactions A à R rR = 1
A à S rS = 2 CA
A à T rT = 1. CA2
with CAO = 2 gmoles/lit. What will be the fractional yield of S when fractional conversion of A is 0.5.
4. For the reactions A + B à R
R + B à S
A and B are mixed in a Batch reactor. What is the maximum concentration of R you obtain.
5. What is the conversion you expect from an adiabatic CSTR with the following operating condition: A à R; specific heat of pure & feed 100 J/gmole; oC, heat of reaction = -20 KJ/gmole; Feed Temperature 30oC; operating temperature 150oC.
6. From a tracer data for a closed vessel the variance and mean residence time were determined as 47.5 and 15 min. what is the approximate value of Peclet no for the vessel.
7. Explain that Michaelis-Menten equation for enzyme kinetics shows a shifting order reaction.
8. What is the mixing procedure you would choose to produce only S from the reaction?
A à R à S (Reactants are A and B).
9. A 2nd order reaction is to be carried out in 3 CSTRS of Vol. 100 lit 150 lit and 200 lit. Explain how they are connected.
10. For two CSTRS operating in series, state the principle involved to determine the min volumes of reactors given feed concentration is CAO and final concentration is CA2. The reaction is first order.
PART – B (5 X 16 = 80 Marks)
11. Determine the conversion you expect from a tubular reactor, using the following data.
1) Tracer Data
TIME(SEC) 1 2 3 4 5 6 8 10 15 20
TRACER CONCENTRATION 9 57 81 90 90 86 77 67 47 32
TIME(SEC) 30 41 52 67 80
TRACER CONCENTRATION 15 7 3 1 0
2) Rate Equation –ra = 0.7 (1/s) CA
What would have been the conversion if tubular reactor is ideal?
12. (A) For the homogeneous gas phase reaction A ® 3R find the space velocity from the following data?
Reaction temp 215oC. Feed consists of 50% A and 50% inerts. Initial concentration of A = 0.0625 mol/lit. Percentage conversion of A = 80%. Rate equator is –rA = 10-2 CA1/2
OR
(B) The following data are obtained at 0oC in a constant volume batch reactor using pure gaseous A
TIME(Min) 0 2 4 6 8 10 12 14
PARTIAL PRESSURE OF A (mm) 760 600 475 390 320 275 240 215
The stoichiometry is A ® 3R. Find the rate equation that represents the data.
13. (A) For the following parallel reactions
A1 A2
A1 + A2 A3
given (k1/k2) = 5. How will you determine the concentration CA2 as a function of CA1.
OR
(B) Acetaldehyde vapour is decomposed in an ideal PFR according to the reaction
CH3CHO à CH4 + CO
The reactor is 3.3 cm ID & 80 cm long and operates at 518oC. In one experiment, the space time is 155 secs and 35% acetaldehyde is decomposed. The 2nd order rate constant is 0.33 (m3/kmol.s) at 518oC. The reaction is irreversible and operates at 1 atm. Calculate the actual residence time.
14. (A) The following mechanism gives an Enzyme (E) reaction with substrate (s) for two binding sites viz., i) reactive ii) Non-reactive, as follows:
E + S D ES
k-1
k2
ES + S D ESS
k-2
ES à E + P
Where P is product.
kr. CEo. Cs
i) Show rp = ------------------------- where Km = (k-1 + kr ) / k1
(Km + Cs2/K2) + Cs K2 = k-2 / k2
ii) At what value of Cs the rate is maximum.
OR
(B) Phosphofructokinase is an enzyme that catalyses one of the steps in the degradation of carbohydrates. Initial rates of reaction (-rso) that converts fructose- 6 - Phosphate (s) to fructose-1, 6 diphosphate (P) as a function of Cso is given below with the same concentration of enzyme in each case.
Cso mmol/lit 50 60 80 100 150 200 250 300 400
(-rso) mmol/lit.min 61 65 72 77 84 88 90 93 95
Calculate Vmax and Michaelis-Menten constant.
15. (A) Write short notes on
a. Tanks in series Model
b. Dispension Model.
OR
(B) Write short notes on
1) Multiple stationary states in CSTR for Exothermic reactions.
2) Determination of CRmax in CSTR for the Reactions
A + B à R
R + B à S
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