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2003 Course Chemical Reaction Eng. - II

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Total No. of Questions : 12] P1348 [Total No. of Pages :3 [3864] - 322 B.E. (Chemical) CHEMICAL REACTION ENGINEERING - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) 7) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Your answers will be valued as a whole. Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) For the fluid particle reaction, derive the expression for unreacted core model, where chemical reaction is a rate controlling step. Draw a suitable sketch.[16] OR Q2) Two small samples of solids are introduced into a constant environment oven and kept there for 1hr under these conditions the 4mm particles are 58% converted, 2 mm particles are 87.5 % converted. a) Find the rate controlling mechanism for the conversion of solids. b) Find the time needed for complete conversion of 1mm particles in this oven. [16] Q3) a) Discuss eight different types of interface behavior for a liquid phase [8] reaction. b) CO2 is to be removed from air by counter current contact with water at 25oC. i) What are the relative resistances of gas and liquid films for this operation. ii) What simplest form of equation would be used for tower design. iii) For this removal operation would you expect reaction with absorption to be helpful and why. Data : For CO2 between air and water kg.a = 80 mol / hr. lt.atm kl.a = 25 / hr H = 30 atm. lt / mol. [10] P.T.O. OR Q4) Tower for straight absorption in which the concentration of undesirable impurity A is to be reduced from 0.1 % to 0.02 % by absorption in pure water. Find the height of tower required for counter current operation. Data for packing used : KAg.a = 32000 mol/hr. m3 atm KAl.a =0.1 /hr The solubility of A in pure water is HA = 125 10-6 atm. m3 / mol L = L' = 7 105 mol / hr . m2 G = G' = 1 105 mol / hr . m2 at = 1 atm molar density of liquid is CT = 56000 mol / m3. Q5) a) b) Explain the determination of surface area using BET method. [18] [8] Explain different types of adsorption isotherms observed in case of heterogeneous catalytic chemical reactions. [8] OR Q6) a) b) The catalytic decomposition A R is taking place in a packed bed reactor filled with 2.4 mm pellets and using a very high recycle rate of product gases. The reaction data is given as. t hr 0 2 4 6 0.75 0.64 0.52 0.39 XA Data :De = 5 10-10 m3 / m - cat . sec s = 1500 kg / m3 - cat T' = 4000 kg . s / m3 Find kinetics of reaction and deactivation, when there exists strong pore diffusion resistance. [8] Explain deactivated catalytic reaction. Discuss general design aspects.[8] SECTION - II Q7) a) b) Derive expression for concentration of reactant within a pore (Single catalytic) and obtain an expression for effectiveness factor. [12] Write note on catalyst poisoning. [3864] - 322 -2- [6] OR Q8) The catalytic reaction A 4R is studied in a plug flow reactor using various amounts of catalyst and 20 liter / hr of pure A feed at 3.2 atm and 117oC. The concentrations of A in the effluent stream is recorded for the various runs as follows. Runs 1 Catalyst used, kg 0.020 2 0.040 3 0.080 4 0.120 5 0.160 C 0.060 0.044 0.035 0.029 A Out mol / lit 0.074 a) Find the rate equation for this reaction using integral method of analysis. b) Find rate equation using differential method of analysis. Q9) Write a short note on : a) Heat effects in packed bed reactor. b) Optimum two stage packed bed reactor. [18] [8] [8] OR Q10)Write a short note on : a) Basket type experimental mixed reactor. b) Experimental Recycle reactor. [8] [8] Q11)Explain the design of stage adiabatic reactor. Draw a neat sketch and state all necessary equation. [16] OR Q12)Discuss in detail about the design of : [16] a) Fluidized bed Reactor. b) Fermentars. ***** [3864] - 322 -3-

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