Name of the University : Savitribai Phule Pune University
Department : Chemical Engineering
Degree : B.E
Subject Code/Name : Membrane Technology
Sem : I
Website : unipune.ac.in
Document Type : Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/unipune.ac.in/6993-be_oct2011.pdf
Membrane Technology Model Paper :
B.E. (Chemical)
(Elective – I) (2008 Course) (Sem. – I) (409341(B))
Time : 3 Hours
Max Marks : 100
Related : Savitribai Phule Pune University Polymer Composites & Blends B.E Question Paper : www.pdfquestion.in/6992.html
Instructions to 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) Explain the general criteria for selection of separation process for certain application. [6]
b) Explain advantages of membrane separation processes over the conventional processes. [6]
c) Air sample containing 20% O2 & 80% N2 is separated by a membrane that gives permeate concentration of 80%. Calculate the retention R and selectivity factora . [6]
OR
Q2) a) Explain use of membrane processes for the following objectives: [8]
i) Concentration.
ii) Purification.
iii) Fractionation.
iv) Reaction mediation.
b) Classify the membrane separation processes based on: [10]
i) Nature of the MOC.
ii) Morphology or structure.
Q3) a) Explain use of polymers in the porous membranes for MF & uF processes. [8]
b) Explain use of inorganic materials as the nonporous membranes for GS & PV processes. [8]
OR
Q4) a) Explain the importance of glass transition temperature and degree of crystallinity on characteristic properties of polymers used as membranes. [8]
b) Explain the importance of chain flexibility in case of polymeric membrane materials. State the effect of character of main chain and of side chain or side groups. [8]
Q5) Explain the following methods of preparation of membranes. [16]
a) Sintering. b) Track etching.
c) Template leaching. d) Phase inversion.
OR
Q6) Explain the following methods of preparation of composite membranes.[16]
a) Interfacial polymerisation.
b) Dip coating.
c) Plasma polymerisation.
SECTION-II :
Q7) Explain the following methods of characterisation of MF membranes. [18]
a) SEM.
b) Bubble-point method.
c) Mercury intrusion porometry.
d) Permeation measurements.
OR
Q8) Explain the following methods of characterisation of uF – membranes. [18]
a) Gas adsorption – desorption.
b) Thermoporometry.
c) Permporometry.
d) Liquid displacement.
Q9) a) Consider a membrane process used to separate a solute from water in a dilute solution. Derive the expression for dissipation function (i. e. entropy production) accompanying this process in the form. [8]
J Jv d f = + where Jv= total volume flux & Jd = diffusive flux.
b) State the phenomenological equations for Jv & Jd in terms of hydrodynamic pressure difference ? p & osmotic pressure difference , in terms of the coupling coefficients L11, L12, L21, L22. using these equations derive the expressions for- [8]
i) Hydrodynamic permeability.
ii) Osmotic permeability.
iii) Reflection coefficient of membrane.
OR
Q10) a) What is electroosmosis? State the expression for dissipation function f for this process. Hence derive the expressions for- [8]
i) Streaming potential.
ii) Electroosmotic flux.
iii) Electroosmotic pressure.
iv) Electric current generated due to solvent flow.
b) Explain solution diffusion mechanism for transport through nonporous membranes with the help of dual sorption theory. [8]
Q11) a) Explain concentration polarisation in pressure driven membrane processes. Derive the basic equation describing concentration polarisation in the form: [8]
Where the symbols have their usual meaning.
b) Explain gel layer model for describing concentration polarisation in uF process state the expression for solvent flux in the gel layer region. [8]
Q12) a) Explain osmotic pressure model for describing concentration polarisation in membranes. Derive the equation for solute flux for this model in the form : [8]
where the symbols have their usual meaning.
Also derive the expression for variation in J with ? p for two extreme conditions
i) High
ii) IT->0 .
b) Describe the construction of following membrane modules. [8]
i) Plate and frame type.
ii) Spiral wound.