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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.

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