CHEMICAL ENGINEERING ,PAPER- II – 2002

Time Allowed: Three hours      Maximum marks: 200

Candidates should attempt questions 1 and 5 which are compulsory, and any THREE of the remaining questions, selecting at least ONE question from each section. Assume suitable data if considered necessary, and indicate the same clearly.

SECTION B

5.     Answer any FOUR of the following :

       (a)  What are the various raw materials / feed stocks used to produce hydrogen in the manufacture of ammonia?

       (b) What are the various routes to produce VCM? Discuss their relevance to India.

       (c)  How the industrial solid wastes are disposed?

       (d) What is the Environmental (protection) Act 1986? Discuss the provisions under it.

       (e)  What are the various factors taken into consideration in lying out of a chemical plant?

6.     (A) What are the by –products / co-products of sugar manufacture and their uses?

        (b) Sugar plant is an example of total energy recovery concept. Elaborate.

        (c) Describe with a neat flow- chart a modern sugar production plant.

7.     (A) What are the major industrial liquid pollutants (in the effluents)

        (b) List the techniques used for removal of dissolved organic solids.

        (c) Discuss the principle and operation of a Trickle-bed filter with a neat sketch) in liquid effluent treatment.

8.     (a) What is Project Scheduling?

        (b) What is the difference between PERT & CPM?

        (C)  Draw up a typical PERT/ CPM Charts for setting up a medium scale chemical plant.

CHEMICAL ENGINEERING ,PAPER- II – 2002

Time Allowed: Three hours      Maximum marks: 200

Candidates should attempt questions 1 and 5 which are compulsory, and any THREE of the remaining questions, selecting at least ONE question from each section. Assume suitable data if considered necessary, and indicate the same clearly.

SECTION A

1.     Answer any four of the following:

         (A) what is proximate analysis of coal? How do you classify Coals? Give examples.

         (B) Discuss the second law of Thermodynamics and its applications.

        (C) What are the ideal reactors? Emphasize the basic assumptions. Write the performance equations for each of these reactors (no need for derivation).

        (D)Discuss the concepts of Effective Diffusivity, Effective thermal conductivity and Effectiveness actor.

        (E)   Discuss the concepts of fugacity, activity and chemical potential.

2.     A natural gas having a composition of CH₄:80% (byvol), C₂ H₆: 8.0, C₃ H₈: 4.5, C₄H₁₀: 2.0,   C₅ H₁₂: 1.0, CO₂: 2.5 and N₂: 2.0 are burnt with excess air in a burner. The burner gases contain (on dry – basis) CO₂: 10.3, N₂: 85.9 and O₂: 3.8. Calculate the per cent excess air supplied and also the composition of the burner gases on wet basis.

3.     Calculate the equilibrium constant for the vapour –phase dehydration of ethylene at 350⁰C. The reaction :

C₂H₅ OH (g) →C₂ H₄ (g) + H₂ O (g).

Data:

Values of the constants in the heat capacity equation:

Cᵨ / R = A + BT+CT² + DT¯² (Tin deg.K)

Component         A          10³B            10⁶C           10¯⁵D

C₂H₅ OH (g)       3.518     20.001       -6.002        0.000

C₂ H₄ (g)            1.424     14.394        -4.392        0.000

H₂ O (g)              3.47        1.450          0.000         0.121

Component      ∆H ⁰ ∫ (298)        J/ mol        ∆G⁰ ∫ (298)        J/ mol

C₂H₅OH                 -235,100                               -168,490

C₂H₄                       +52,510                                   68,460

H₂O                         -241,818                              -228,572

4.     What is the importance of pore –diffusion in gas-solid) porous catalyst) reactions? Derive an expression for the effectiveness factor I order kinetics and single cylindrical pore.