LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

GH 48

M.Sc. DEGREE EXAMINATION – CHEMISTRY

FOURTH SEMESTER – APRIL 2008

    CH 4955 – ORGANIC CHEMICAL TECHNOLOGY

 

 

 

Date : 25/04/2008            Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

Answer ALL questions.                                                                     (10 ´ 2 = 20 marks)

 

1. What are the factors that affect the chemical-process kinetics?
2. How is nitryl ion confirmed as the nitrating agent in aromatic nitration?
3. Compare the sulphonating property of liquid SO₃ and H₂SO_4.
4. Write short note on the reactor materials used for various chemical reactions in industry.
5. How is paracetamol prepared?
6. What are Reynolds numbers? Give its significances.
7. What is boiling point diagram?
8. Mention the different streams involved in the transfer of heat and material across a plate.
9. How leaching process is advantageous over washing and filtration process.
10. What are the types of impellers? Give its applications.

 

PART – B

Answer any EIGHT questions.                                                          (8 ´ 5 = 40 marks)

 

11. How are chemical reactors classified? Explain any three in detail.
12. Write detailed notes on complex series reactions.
13. Explain the effect of dilution in the formation of nitryl ion from acid mixture for aromatic nitration.
14. Give a detailed account on the design and material of reactors used for sulphonation.
15. Write short notes on various types of oxidising agents used industrially.
16. Explain how penicillin is synthesized by industrial method.
17. Explain hydrostatic equilibrium in a static fluid system.
18. How immiscible liquids are separated by continuous gravity decanter?
19. Define velocity gradient in a steady one-dimensional laminar flow.
20. What is pump efficiency in Bernoulli equation?
21. Explain the material balance of binary mixtures in the flash distillation process.
22. Explain the working principle of spray dryers.

 

PART – C

Answer any FOUR questions.                                                           (4 ´ 10 = 40 marks)

 

23. a) Explain the detailed synthesis of nitrobenzene using Hough nitrator. (8)
24. b) How back mixing affects the product distribution in batch reactors? (2)
25. a) What are the differences between fixed and fluidized bed catalytic reactors? Explain with examples. (5)
26. b) List out various workup procedures to isolate sulphonated products. Explain each one in detail.                                                                                                                                                            (5)
27. a) Write short notes on selection of suitable plant equipments. (4)
28. b) Explain in detail the preparation of red and white pigments. (6)
29. Derive an expression for the mechanical energy balance in potential flow and how the friction term is included in that expression.
30. How the number of plates required for a distillation process is calculated by McCabe-Thiele method?
31. Explain the working principle of the following
    a) Flash dryer              b) Bollman extractor.

 

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