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2003 Course Novel Separation Processes (Elective) (II)

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Total No. of Questions : 12] P1372 [Total No. of Pages : 4 [3764]-396 B.E. (Petrochemical) NOVEL SEPARATION PROCESSES (Elective) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidate: 1) Answer any three questions from each section. 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) Attempt the following: a) Classify membrane separation processes by giving examples. b) [18] Discuss in brief on: adsorptive bubble separation techniques. c) Explain in brief the selection criteria for chemical engineering separation processes. OR Q2) Classify the models for gas separation by membranes. Develop cross flow model for membrane separation processes. State the assumption made. Discuss the solution strategy for different cases. [18] Q3) a) A 9-micron tubular membrane is used to recover salt A from a dilute solution. The solutions to either side are at 0.028 and 0.004 kmol/m3, with mass transfer coefficients of 3.5 10 5 and 2.25 10 5 m/s respectively. The distribution coefficient is 0.85 and the diffusivity of A in the membrane is 275 10 11 m2/s. i) Calculate the percentage of total resistance to mass transfer contributed by the membrane. ii) Calculate the membrane area needed to allow recovery at 0.015 kmol/hr. Flow inside the tube is turbulent and mass transfer follows the Gilliland. Sherwood and Linton correlation. If the velocities of both solutions are doubled. What will the membrane resistance now be? [8] P.T.O. 1

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