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2003 Course Chemical Reaction Eng. - II

4 pages, 23 questions, 1 questions with responses, 1 total responses,

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Total No. of Questions : 12] P1012 [Total No. of Pages : 4 [3664]-273 B.E. (Chemical) CHEMICAL REACTION ENGINEERING - II Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section-II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) In case of shrinking core model derive the rate expression for the case of chemical reaction resistance is rate controlling step for solid as reactant. [9] b) Spherical particles of zinc blende of size R=1 mm are roasted in an 8% oxygen stream at 900 C and 1 atm. The stoichiometry of the reaction is: 2ZnS + 3O2 2ZnO + 2SO2 Assuming that the reaction proceeds by the shrinking-core model calculate the time needed for complete conversion of a particle and the relative resistance of ash layer diffusion during the operation. Data: Density of solids = 4.13 gm/cm3 = 0.0425 mol/cm3. Reaction rate constant k = 2cm/sec, For gases in the ZnO layer, De = 0.08 cm2/sec. Note that film resistance can safely be neglected as long as growing ash layer is present. [8] OR Q2) Uniform sized spherical particles of UO3 are reduced to UO2 in a uniform environment with the following results: t, hr 0.180 0.347 0.453 0.567 0.733 XB 0.45 0.68 0.8 0.95 0.98 If the reaction follows shrinking core model, find the rate controlling mechanism and a rate equation to represent this reaction. [17] P.T.O.

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