Pune University Membrane Technology Question Papers

Pune University Membrane Technology Question Papers

B.E. (Chemical) MEMBRANE TECHNOLOGY (Elective – I) (2008 Pattern) (Sem. – I)

Time :3 Hours]                                                                           [Max. Marks :100

Instructions to the candidates:-

1)            Answer any 3 questions from each section.

2)            Answers to the two sections should be written in separate answer books.

3)             Neat diagrams must be drawn wherever necessary.

4)             Pigures 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

QI) a) Compare the performance of membrane separation process with conventional methods of separation.                                                                                       [6]

b)            Define – selectivity and volume flux of a membrane. Explain how they represent efficiency of membrane.                                                                         [6]

c)            Define membrane and classify membranes based on nature morphology. [6]

OR

Q2) a) What are composite membranes? How are they prepared?         [6]

b)            State industrial applications of membrane technology.                              [6]

c)            Define separation factor of a membrane. Explain its significance.           [6]

Q3) a) Explain steroisomerism in case of polymeric membranes.            [8]

b) Explain the effect of chain flexibility and chain interactions on properties of polymeric membranes.                                                                                               [8]

OR

Q4) a) Explain the effect of polymeric structure on glass transition temperature of a membrane                                                                                                            [8]

b)            State the factors which determine thermal and chemical stability of membrane         [8]

 

Q5) a) With neat sketches explain the characteristics of porous, non-porous and carrier mediated transport membranes.                                                                                         [8]

b) Explain four different methods for preparation of phase inversion membranes.   [8]

OR

Q6) a) Explain immersion precipitation techniques for preparation of flat and tubular membranes.                                                                                                                               [8]

b) Explain any four methods of preparation of composite membranes. [8]

SECTION – II

Q7) Explain the following methods for determination of structure – related parameters of MF membranes.                                                                                                       [18]

a)             Scanning electron microscopy.

b)            Bubble – point method.

c)            Mercury intrusion porometry.

OR

Q8) a) Explain the permeability method used to determine the pore size and pore size distribution of hydrophobic MF membranes.                                                                      [6]

b) Explain the following methods to characterise the UF membranes. [12]

i)              Gas adsorption – desorption.

ii)           Thermoporometry.

iii)        Permporometry.

Q9) a) Explain the driving forces responsible for transport through membranes.

Derive the expression for average dimensionless driving force. [8] b) Explain transport mechanisms of gases through porous membranes by [8]

i)             Kundsen flow through narrow pores.

ii)           Viscous flow in wide pores.

OR

QIO) a) Explain friction model approach for transport through porous membranes based on viscous flow and diffusion mechanisms.                                                        [8]

b) Explain unified approach for transport through porous and nonporous membranes based on the diffusional flow and convective flow described by the equation.       [8]

j= DCJ l

RT

Explain concentration polarisation in pressure driven processes. [8] Explain gel layer model for describing concentration polarisation. [8]

OR

Explain boundary layer resistance model for describing concentration polarisation.        [8]

Explain the factors responsible for membrane fouling.                               [8]

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