Chemical Technology - Dec 2015

Chemical Engineering (Semester 5)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Write short note on (any four):

1 (a) Differentiate between Soaps and detergents.(5 marks) 1 (b) Differentiate between HDPE and LDPE.(5 marks) 1 (c) Describe Mercury cell for Caustic soda.(5 marks) 1 (d) What is starch? What are its sources? Enumerate its applications.(5 marks) 1 (e) Differentiate between refining and cracking.(5 marks) 2 Describe DCDA process for sulfuric acid manufacture from elemental sulphur with reference to:
i) Why multistage reactor used?
ii) Why interpass absorption done?
iii) How energy conservation achieved?
iv) What are typical process conditions?
v) What is the typical SO₂ conservation achieved and composition of tail gas?(20 marks) 3 (a) Explain manufacture of phenol using Toluene as a raw material in brief.(10 marks) 3 (b) Describe manufacture of sugar from sugar cane. And explain inversion of sugar.(10 marks) 4 (a) Describe the manufacturing process used for synthesis of ethylene by naphtha cracking.(10 marks) 4 (b) Explain the manufacture of Soda ash by Solvay process.(10 marks) 5 (a) Describe manufacturing process of styrene starting from ethyl benzene. What are the major engineering problems associated with the process? How will you produced 99.9% pure styrene.(12 marks) 5 (b) Describe the manufacture of PTA with simple sketch.(8 marks) 6 (a) Describe manufacture of Polytheylene in details.(10 marks)

Write short note on (any two):

6 (b) (i) Hydrogenation of oil.(5 marks) 6 (b) (ii) Dyes and intermediates.(5 marks) 6 (b) (iii) Energy picture of india.(10 marks)