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- Chemical Reaction Engineering - CRE
- 2018
- PYQ
**Biju Patnaik University of Technology BPUT - BPUT**- Chemical Engineering
- B.Tech
**262 Views**- 13 Offline Downloads
- Uploaded 11 months ago

Registration No : Total number of pages : 02 B.Tech. PCCH4305 6th Semester Back Examination 2017-18 CHEMICAL REACTION ENGINEERING BRANCH : CHEM Time : 3 Hours Max Marks : 70 Q.CODE : C537 Answer Question No. 1 which is compulsory and any FIVE from the rest. The figures in the right-hand margin indicate marks. Assume suitable notations and any missing data wherever necessary. Answer all parts of a question at a place. Q1. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) Q2. Q3. (a) (b) Answer the following questions : (2 x 10) Discuss the significance of Activation energy. Enumerate the ways of defining the rate equation. Define a constant density system with suitable examples. Write the integrated equation for a third order reaction. What are the disadvantages of half life method of interpreting batch reactor data? Find out the holding time for the conversion in a mixed reactor accomplishing a reaction A → 3R is 50% when gaseous reactant A is introduced at the rate of 1 lit/sec and the leaving flow rate is 2 lit/sec. Give an account of chain and non-chain reactions with a suitable example. Briefly describe about age distribution of fluid. A common rule of temperature is that the rate of reaction doubles for each 10o rise in temperature. What activation energy would this suggest at a temperature of 25oC? Define selectivity in multiple reactions. Derive the integrated rate equation for a reversible unimolecular type first order reaction. Explain in details the typical concentration-time curves for the same. (10) Derive the performance equation of a mixed flow reactor for constant and variable systems. From the data given below show that the conversion of N- para – chloroacetanilide is a reaction of first order : (7) Time (h) N 0 49.3 1 35.6 2 25.75 (3) 3 18.5 Where N is the number of ml of Na2S2O3 solution required for a definite volume mixture. Q4. (a) (b) Give a qualitative description about product distribution in case of parallel reactions. Differentiate between molecularity and order of reaction with suitable examples. (6) (4)

Q5. (a) (b) Q6. Q7. (a) (b) Q8. (a) (b) (c) (d) Define ∈A. Consider a gaseous feed at T 0 = 1000 K, P0 = 5 atm, CA0 = 100moles/lit, CB0 = 200moles/lit enters a flow reactor in which A + B 5 R occurs. Find ∈A. In an isothermal batch reactor 70 % of a reactant is converted in 13 minutes. Find the space time and space velocity needed to effect this conversion in a plug flow reactor and a mixed flow reactor. (3) Compare the size of mixed flow reactor with plug flow reactor for a second order reaction. (10) Explain the differential method of analysis of rate data. Consider a gas phase reaction 2A = R + 2S with unknown kinetics. If for 90 % conversion of a A in plug flow reactor, the space velocity of 1 lit/min is needed, find the corresponding space time and mean residence time of a fluid in the reactor. (4) (6) Write short notes on any TWO : Residence time distribution Basics of non-ideal flow Temperature dependency from transition state theory Steady state continuous stirred tank reactor (7) (5 x 2)

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