Roll No. Total No. of Pages : 03
Total No. of Questions : 09
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B.Tech.(Petroleum Refinary Engineering) (2013 Batch) (Sem.-4)CHEMICAL REACTION ENGINEERING-I
Subject Code : BTPC-406/BTCH-405
M.Code : 72429
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTION TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
SECTION A
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Q1. Answer briefly :
- Define rate constant and give its units.
- Give the physical significance of activation energy.
- Enumerate the various methods for analyzing the kinetic data.
- Give the advantages and disadvantages of batch reactor.
- Differentiate between elementary and non-elementary reaction.
- Differentiate between conversion and yield.
- Draw graph between concentration and time for autocatalytic reaction.
- Give the significance of RTD.
- What is the effect of temperature on equilibrium conversion ?
- The half life of a first order reaction A ? B is 10min. Find the conversion after 50min.
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SECTION-B
The following data has been obtained for an irreversible reaction A?B carried out in a constant volume batch reactor. Find the reaction order and the reaction rate constant.
| Time, t(min) | 0 | 5 | 10 | 15 | 20 |
|---|---|---|---|---|---|
| Concentration of A, CA (mol/lit) | 4.0 | 2.33 | 1.1 | 0.33 | 0.01 |
Derive the performance equation for a batch reactor for constant density first order system. Show it graphically.
50% conversion for a homogeneous liquid phase reaction A ? B; -rA = kCA2 takes place in a CSTR. Find the conversion if this reactor is replaced with another having volume 4 times that of original reactor. All the other process conditions remain the same.
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From steady state kinetic runs in a mixed flow reactor, the following data is obtained for the liquid phase homogeneous reaction. Find the space time needed to treat a feed of CA0 =100 mol/m3 to 90% conversion in a plug flow reactor.
| Time, sec | 60 | 35 | 11 | 20 | 11 |
|---|---|---|---|---|---|
| CA0, mol/m3 | 50 | 100 | 100 | 200 | 200 |
| CA,mol/m3 | 20 | 40 | 60 | 80 | 100 |
80% conversion is achieved in a single CSTR wherein 1st order reaction is carried out. Find out how the addition of another similar CSTR in series with the first one will affect conversion of reactant ?
SECTION-C
- Define E, C and F curve. Give interrelationship between them.
- Following data has been obtained when a tracer was injected as a pulse into a reactor.
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| T,min | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cout,gm/L | 0 | 2 | 5 | 8 | 10 | 8 | 6 | 4 | 3 | 2.25 | 1.5 | 0.3 | 0 |
Construct an E curve. Determine the fraction of material leaving the reactor that has spent time inside the reactor between 3 & 5 min.
8. For the irreversible first order series reaction ; A ? R ? S in a CSTR. Find an expression to calculate i) the time for achieving maximum concentration of R ii) Maximum concentration of R.
9. An elementary irreversible liquid-phase reaction A + B ? C is carried out in a CSTR. The molar flow rate of A and B fed to the reactor at a temperature of 300K are 1.25 mol/sec and 1 mol/sec respectively. The reactor is jacketed and the jacket temperature is maintained at 310 K. An agitator contributes a work of 20.9 kW to the reactor. The volumetric flow rate is 5 Lit/sec. Determine the volume of the reactor for 50% conversion of A. Given that
CPA=40cal/mol.K; CPB=50cal/mol.K; CPC=60cal/mol.K; k(300K)=0.01/lit.mol.Sec; E=8000cal/mol
?Hrxn(298K)=-20kcal/mol; ?HB(298 K)=-22 kcal/mol; U.A=175 cal/sec.K
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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 March (All Branches)