# Pune University BE (Petrochemical Engineering) Polymer Reaction Engineering Question Papers

B.E. (Petrochemical Engineering) POLYMER REACTION ENGINEERING (2008 Pattern) (Elective – IV) (Sem. – II)

Time :3 Hours]                                                                                              [Max. Marks :100

Instructions to the candidates :-

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

2)            Solve any three questions from each section.

3)            Numbers to the right indicate full marks.

4)            Assume suitable data, if necessary.

5)            Use of logarithmic table, electronic pocket calculators is allowed.

SECTION – I

QIA a) Explain the distinctive features of Polymerization Reaction Engineering.

[8]

b) Discuss the distinction between addition polymerization V s condensation polymerization.                                                                                                                       [8]

Q2) a) Discuss all the mechanism steps to be used in Free radical polymerization with one suitable example.                                                                                            [12]

b) Derive the necessary equation of the rate of Initiation @ri) in terms of Initiator concentration [I].                                                                                        [6]

Q3) Styrene is polymerized in batch reactor at 60oC with the free radical initiator. The initial concentration of styrene is 8.35 gmole/lit, and the concentration of initiator is kept constant at 0.04 gmole/lit. Assume termination takes place only by combination. The rate constant are as KQ = 3* 10_6 sec1, Kp = 176 lit/gmole. Sec, Kc = 3.6* 10U lit/gmole. Sec, f = 0.6 the volume of the reactor filled by the reacting system is 3760 lit.                                            [16]

For a reaction time of 180 min, compute the following:

a)            The percentage of the styrene polymerized,

b)           The number average molecular weight.

Q4) a) Explain the following quantities to be used in the Characterization of Long Chain Molecules :                                                                                                        [12]

i)              Weight Fraction,

ii)           First moment of Pj’s

iii)        Number Average degree of Polymerization.

iv)         Weight Average Degree of Polymerization

v)           Number Average Molecular Weight

vi)         Weight Average Molecular Weight.

b) Find the Polydispersity Index of the mixture composed of 20 molecules of 1000 monomer lengths and 380 molecules of I monomer lengths. [4]

SECTION – II

Q5) a) Discuss importance and types of copolymers.                                                     [8]

b) Discuss copolymer behavior based on monomer reactivity ratio. [8]

Q6) a) Write a note on Aqueous Emulsifier Solutions.                                                  [6]

b) Discuss the necessary equation for the steady state population balance equation for the particles having ‘n’ radicals in the Emulsion polymerization.         [10]

Q7) a) Write a short note on Reactor Selection for carrying out polymerization reaction.                                                                                                                                [W]

b)            Write in detail about the process control strategies in polymerization process.                                                                                                                               [W]

Q8) a) Draw process flow sheet for the production of Nylon 6 and explain the process in detail.                                                                                                                                [W]

Write a short note on polymerization of Styrene.          [7]