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2003 Course Chemical Reaction Engineering - II

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Total No. of Questions :12] [Total No. of Pages :4 [3864]-431 Final Year B. E. (Biotech.) CHEMICAL REACTION ENGINEERING - II ( 2003 Course) (409343) P1110 Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Figures to the right indicate full marks. 2) Use of Programmable calculator is not allowed. 3) Draw a neat sketch wherever necessary. 4) Make necessary assumptions wherever required. 5) Answer any THREE questions from Section I and any THREE questions from Section II. SECTION - I Q1) a) b) Calculate time needed to burn to completion particles of graphite (R0= 4.5mm, = 2.2gm/cc, k = 20 gm/s) in 8% oxygen stream. Assume that gas film diffusion doesn t offer resistance to diffusion and reaction. [6] Solids of unchanging size (R=0.3mm) are reacted with gas in steady flow bench scale fluidized reactor with following result : [12] Fo= 10gm/s, W = 100 gms, XB = 0.75 OR Q2) a) Spherical solid particles containing B are roasted isothermally in an oven with gas of constant composition. Solids are converted to nonflaking product according to SCM with initial concentration of A as 0.01 kmol/ m3. Determine rate controlling mechanism for this transformation in these cases. [12] Case - I Case - II Dp, mm t,sec DP XB t,sec 2 0.87 1 1 0.3 2 1 b) XB 1 1 1 0.75 5 Write short note on : i) Shrinking Core Model. ii) [6] Progressive Conversion Model. P.T.O.

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