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2003 Course Chemical Reaction Eng. - II

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Total No. of Questions : 12] [Total No. of Pages : 4 P1490 [3764]-322 B.E. (Chemical Common to Biotechnology) CHEMICAL REACTION ENGINEERING - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) The reduction of iron ore of density B = 4.6 gm/cm3 and size R = 5 mm by hydrogen can be approximated by unreacted core model. 4H 2 + Fe3O 4 4H 2O + 3Fe With rate approximately proportional to the concentration of hydrogen in 24000 RT cm/sec . Taking D = 0.03cm2/ the gas stream. ks = 1.93 105 e e sec, calculate the time necessary for complete conversion of a particle from oxide to metal at 600 oC. Does any particular resistance control? If not what is the relative importance of various resistance? [18] OR Q2) A solid feed consisting of 20 % of 1 mm particles 30 % of 2 mm particles and 50 % of 4 mm particles is to be passed through a rotating tubular reactor, some what like a cement kiln, where it reacts with gas of uniform composition to give hard nonfriable solid product. Experiments show that the progress of conversion can reasonably represented by reaction control for unreacted core model and that the time for complete conversion of 4 mm particles is 4 hrs. Find the residence time needed in the tubular reactor for (a) 75% conversion of solids (b) 95% conversion of solids and (c) 100% conversion of solids. [18] P.T.O.

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